feat: add workflows for testing, linting, compiling

.github/workflows/ci.yml

@@ -0,0 +1,121 @@
+name: CI
+
+on:
+  push:
+    branches: [master, develop]
+  pull_request:
+    branches: [master, develop]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache cargo index
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
+      - name: Cache cargo build
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-build-target-
+
+      - name: Run clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache cargo index
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
+      - name: Cache cargo build
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-build-target-
+
+      - name: Run tests
+        run: cargo test --verbose
+
+  build:
+    name: Build (Linux Debug)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+
+      - name: Cache cargo index
+        uses: actions/cache@v4
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
+      - name: Cache cargo build
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-build-target-
+
+      - name: Build project
+        run: cargo build --verbose

.github/workflows/format.yml

@@ -0,0 +1,22 @@
+name: Format Check
+
+on:
+  push:
+    branches: [master, develop]
+  pull_request:
+    branches: [master, develop]
+
+jobs:
+  format:
+    name: Format Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check

Cargo.toml

@@ -1,34 +1,35 @@
 [package]
 name = "time-banner"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-resvg = "0.34.1"
-axum = "0.6.18"
+resvg = "0.45.1"
+axum = "0.8.4"
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0.68"
-tokio = { version = "1.0", features = ["full"] }
+serde_json = "1.0.140"
+tokio = { version = "1.46", features = ["full"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-futures = "0.3.28"
-png = "0.17.9"
+futures = "0.3.31"
+png = "0.17.16"
 dotenvy = "0.15.7"
 envy = "0.4.2"
-tera = "1.19.0"
-lazy_static = "1.4.0"
-timeago = "0.4.1"
-chrono-tz = "0.8.3"
-phf = { version = "0.11.2", features = ["macros"] }
-phf_codegen = "0.11.1"
-chrono = "0.4.26"
-regex = "1.8.4"
+tera = "1.20.0"
+lazy_static = "1.5.0"
+timeago = "0.4.2"
+chrono-tz = "0.10.3"
+phf = { version = "0.12.1", features = ["macros"] }
+phf_codegen = "0.12.1"
+chrono = "0.4.41"
+regex = "1.11.1"
+ico = "0.4.0"
 
 [build-dependencies]
-chrono = "0.4.26"
-regex = "1.8.4"
-phf = { version = "0.11.1", default-features = false }
-phf_codegen = "0.11.1"
-lazy_static = "1.4.0"
+chrono = "0.4.41"
+regex = "1.11.1"
+phf = { version = "0.12.1", default-features = false }
+phf_codegen = "0.12.1"
+lazy_static = "1.5.0"

Dockerfile

@@ -1,45 +1,70 @@
 # Build Stage
-FROM rust:1.68.0 as builder
+FROM rust:1.81.0-alpine as builder
 
+# Install build dependencies
+RUN apk add --no-cache \
+    musl-dev \
+    pkgconfig \
+    openssl-dev
+
+WORKDIR /usr/src
 RUN USER=root cargo new --bin time-banner
-WORKDIR ./time-banner
-ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-COPY ./Cargo.toml ./Cargo.toml
+WORKDIR /usr/src/time-banner
+
+# Copy dependency files for better layer caching
+COPY ./Cargo.toml ./Cargo.lock* ./build.rs ./
+# Copy the timezone data file needed by build.rs
+COPY ./src/abbr_tz ./src/abbr_tz
+
 # Build empty app with downloaded dependencies to produce a stable image layer for next build
 RUN cargo build --release
 
 # Build web app with own code
 RUN rm src/*.rs
-ADD . ./
+COPY ./src ./src
 RUN rm ./target/release/deps/time_banner*
 RUN cargo build --release
 
+# Strip the binary to reduce size
+RUN strip target/release/time-banner
 
-FROM debian:bullseye-slim
+# Runtime Stage - Alpine for smaller size and musl compatibility
+FROM alpine:3.19
 ARG APP=/usr/src/app
+ARG APP_USER=appuser
+ARG UID=1000
+ARG GID=1000
 
-RUN apt-get update \
-    && apt-get install -y ca-certificates tzdata \
-    && rm -rf /var/lib/apt/lists/*
+# Install runtime dependencies
+RUN apk add --no-cache \
+    ca-certificates \
+    tzdata
 
-ENV TZ=Etc/UTC \
-    APP_USER=appuser
+ENV TZ=Etc/UTC
 
-RUN groupadd $APP_USER \
-    && useradd -g $APP_USER $APP_USER \
+# Create user with specific UID/GID
+RUN addgroup -g $GID -S $APP_USER \
+    && adduser -u $UID -D -S -G $APP_USER $APP_USER \
     && mkdir -p ${APP}
 
-COPY --from=builder /time-banner/target/release/time-banner ${APP}/time-banner
-COPY --from=builder /time-banner/src/fonts ${APP}/fonts
-COPY --from=builder /time-banner/src/templates ${APP}/templates
+# Copy application files
+COPY --from=builder --chown=$APP_USER:$APP_USER /usr/src/time-banner/target/release/time-banner ${APP}/time-banner
+COPY --from=builder --chown=$APP_USER:$APP_USER /usr/src/time-banner/src/fonts ${APP}/fonts
+COPY --from=builder --chown=$APP_USER:$APP_USER /usr/src/time-banner/src/templates ${APP}/templates
 
-RUN chown -R $APP_USER:$APP_USER ${APP}
+# Set proper permissions
+RUN chmod +x ${APP}/time-banner
 
 USER $APP_USER
 WORKDIR ${APP}
 
-EXPOSE 3000
-ENV PORT 3000
+# Use ARG for build-time configuration, ENV for runtime
+ARG PORT=3000
+ENV PORT=${PORT}
+EXPOSE ${PORT}
 
+# Add health check (using wget since curl isn't in Alpine by default)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost:${PORT}/health || exit 1
 
 CMD ["./time-banner"]

README.md

@@ -1,68 +1,85 @@
 # time-banner
 
-My first Rust project, intended to offer a simple way to display the current time relative, in an image format.
-
-## Planned Features
-
-- Dynamic light/dark mode
-    - Via Query Parameters for Raster or SVG
-    - Via CSS for SVG
-- Relative or Absolute Format
-- Dynamic Formats
-- Caching Abilities
-    - Relative caching for up to 59 seconds, purged on the minute
-    - Absolute caching for up to 50MB, purged on an LRU basis
-- Flexible & Dynamic Browser API
-    - Allow users to play with format in numerous ways to query API
-    - Examples
-        - `/svg/2023-06-14-3PM-CST`
-        - `2023-06-14-3PM-CST.svg`
-        - `/jpeg/2023.06.14.33` (14th of June, 2023, 2:33 PM UTC)
-        - `/jpeg/2023.06.14.33T-5` (14th of June, 2023, 2:33 PM UTC-5)
+Dynamically generated timestamp images
 
 ## Routes
 
-```shell
-/{time}[.{ext}]
-/{rel|relative}/{time}[.{ext}]
-/{abs|absolute}/{time}[.{ext}]
+`GET /[relative|absolute]/[value]{.ext}?tz={timezone}&format={format_string}&now={timestamp}&static={boolean}`
+
+- [x] `{relative|absolute}` - The display format of the time.
+- [x] `{value}` - The time value to work with. Relative values can be specified by prefixing with `+` or `-`.
+  - [ ] Relative values are relative to the value acquired from the `now` parameter (which defaults to the current time).
+  - Whether the value is relative or absolute has nothing to do with the display format.
+  - [x] `/absolute/+0` will display the current time in UTC.
+  - [ ] Note: The `now` parameter is returned in the `Date` response header.
+- [x] `Accept` or `{.ext}` - Determines the output format. If not specified, `.svg` is assumed.
+  - [ ] `Accept` requires a valid MIME type.
+  - [x] `.ext` requires a valid extension.
+  - [ ] Supported values: `.png`/`image/png`,
+- [ ] `X-Timezone` or `?tz={timezone}` - The timezone to display the time in. If not specified, UTC is assumed.
+  - [ ] `auto` will attempt to determine the timezone from the client's IP address. Depending on currently unknown factors, this may be disregarded.
+    - [ ] Return detected timezone in `X-Timezone` response header.
+- [ ] `?format={format}` - The format of the time to display. If not specified, `%Y-%m-%d %H:%M:%S %Z` is assumed.
+  - [ ] Only relevant for `absolute` values.
+- [ ] `X-Date-Now` or `?now={timestamp}` - The timestamp to use for relative time calculations. If not specified, the current time is used.
+- [ ] `?static={boolean}` - Whether to redirect to a static version of the URL. Useful for creating specific URLs manually.
+  - [ ] If a value is not passed, (`?static`), `true` is assumed. Anything other than `true`, `1` or `yes` (case-insensitive) is considered `false`.
+  - [ ] Some header values will be translated to query parameters if provided (not `Accept`).
+  - [ ] e.g. `/rel/+3600.png?static&now=1752170474` will redirect to `/relative/1752174074.png`
+- [x] `/favicon.ico` - Returns a dynamic favicon of an analog clock.
+  - [ ] Uses naive timestamp from `X-Date-Now` if provided.
+  - [ ] Uses timezone from `X-Timezone` if provided.
+  - [ ] Uses IP geolocation to determine timezone if neither is provided.
+
+### Examples
+
+```
+/1752170474 => 2025-07-10 12:01:14 UTC
+/abs/1752170474 => 2025-07-10 12:01:14 UTC
+/absolute/+3600 => 2025-07-10 13:01:14 UTC
+/abs/-1800 => 2025-07-10 11:01:14 UTC
+/rel/1752170474 => 15 minutes ago
+/rel/+3600 => 1 hour from now
+/relative/-1800 => 30 minutes ago
+/relative/1752170474.png?tz=America/Chicago => 2025-07-10 06:01:14 CDT
+/relative/1752170474?type=relative => 2081-01-17 12:02:28 PM
 ```
 
-- If relative or absolute is not specified, it will be the opposite of the time string's format.
+## Ideas
 
-### Query Parameters
-
-- `format` - Specify the format of the time string
-- `tz` - Specify the timezone of the time string. May be ignored if the time string contains a timezone/offset.
-
-## Structure
-
-1. Routing
-    - Handle different input formats at the route layer
-2. Parsing
-    - Module for parsing input
-3. Cache Layer
-    - Given all route options, provide a globally available cache for the next layer
-4. SVG Template Rendering
-    - Template rendering based on parsed input
-5. (Optional) Rasterization
-    - If rasterization is requested, render SVG to PNG
-6. (Catch-all) Error Handling
-    - All errors/panics will be caught in separate middleware
-
-## Input Parsing
-
-- Date formatting will be guesswork, but can be specified with `?format=` parameter.
-    - To avoid abuse, it will be limited to a subset of the `chrono` formatting options.
-- The assumed extension when not specified is `.svg` for performance sake.
-    - `.png` is also available. `.jpeg` and `.webp` are planned.
-- Time is not required, but will default each value to 0 (except HOUR, which is the minimum specified value).
-- Millisecond precision is allowed, but will be ignored in most outputs. Periods or commas are allowed as separators.
-- Timezones can be qualified in a number of ways, but will default to UTC if not specified.
-    - Fully qualified TZ identifiers like "America/Chicago" are specified using the `tz` query parameter.
-    - Abbreviated TZ identifiers like "CST" are specified inside the time string, after the time, separated by a dash.
-        - Abbreviated terms are incredibly ambiguous, and should be avoided if possible. For ease of use, they are
-          available, but several of them are ambiguous, and the preferred TZ has been specified in code.
-        - Full table available in [`abbr_tz`](./src/abbr_tz). Comments designated with `#`. Preferred interpretation
-          designated arbitrarily by me. Table sourced
-          from [Wikipedia](https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations)
+- Frontend with React for Demo
+  - Refetch favicon every 10 minutes
+  - Click to copy image URLs
+  - Dynamic Examples
+- Dynamic light/dark mode
+  - `?theme={auto|light|dark}`, default `light`
+  - Customizable SVG templates
+- Dynamic favicon generation
+  - Clock svg optimized for favicon size
+  - Move hands to the current time
+  - Use geolocation of request IP to determine timezone
+  - Advanced: create sun/moon SVG based on local time
+- Support for different timezone formats in query parameters or headers
+  - `?tz=...` or `X-Timezone: ...`
+  - `CST` or `America/Chicago` or `UTC-6` or `GMT-6` or `-0600`
+  - Automatically guessed based on geolocation of source IP address
+- Complex caching abilities
+  - Multi-level caching (disk with max size, memory)
+  - Automatic expiry of relative items
+  - Use browser cache headers
+  - Detect force refreshs and allow cache busting
+- `Accept` header support
+- IP-based rate limiting
+  - Multi-domain rate limiting factors
+    - Computational cost: 1ms = 1 token, max 100 tokens per minute
+    - Base rate: 3 requests per second
+- Cached Conversions
+  - If PNG is cached, then JPEG/WEBP/etc. can be converted from cached PNG
+- Additional date input formats
+  - 2025-07-10-12:01:14
+  - 2025-07-10-12:01
+  - 2025-07-10-12:01:14-06:00
+  - 2025-07-10-12:01:14-06
+  - 2025-07-10-12:01:14-06:00:00
+  - 2025-07-10-12:01:14-06:00:00.000
+  - 2025-07-10-12:01:14-06:00:00Z-06:00

build.rs

@@ -1,71 +1,194 @@
+use lazy_static::lazy_static;
+use regex::Regex;
 use std::env;
+use std::fmt;
 use std::fs::File;
 use std::io::{BufRead, BufReader, BufWriter, Write};
 use std::path::Path;
-use regex::Regex;
-use lazy_static::lazy_static;
 
-lazy_static! {
-    static ref FULL_PATTERN: Regex = Regex::new(r"([A-Z]+)\s\t.+\s\tUTC([−+±]\d{2}(?::\d{2})?)").unwrap();
-    static ref OFFSET_PATTERN: Regex = Regex::new(r"([−+±])(\d{2}(?::\d{2})?)").unwrap();
+/// Error types for build script failures
+#[derive(Debug)]
+enum BuildError {
+    Io(std::io::Error),
+    Regex(String),
+    Parse(String),
+    Env(env::VarError),
 }
 
-const HOUR: u32 = 3600;
+impl fmt::Display for BuildError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            BuildError::Io(e) => write!(f, "IO error: {}", e),
+            BuildError::Regex(msg) => write!(f, "Regex error: {}", msg),
+            BuildError::Parse(msg) => write!(f, "Parse error: {}", msg),
+            BuildError::Env(e) => write!(f, "Environment error: {}", e),
+        }
+    }
+}
 
-fn parse_offset(raw_offset: &str) -> i32 {
-    let capture = OFFSET_PATTERN.captures(raw_offset).expect("RegEx failed to match offset");
-    println!("{}: {}", raw_offset, capture.get(1).expect("First group capture failed").as_str());
+impl From<std::io::Error> for BuildError {
+    fn from(error: std::io::Error) -> Self {
+        BuildError::Io(error)
+    }
+}
 
-    let is_west = capture.get(1).unwrap().as_str() == "−";
-    let time = capture.get(2).expect("Second group capture failed").as_str();
-    let (hours, minutes) = if time.contains(':') {
-        let mut split = time.split(':');
-        let hours = split.next().unwrap().parse::<u32>().unwrap();
-        let minutes = split.next().unwrap().parse::<u32>().unwrap();
+impl From<env::VarError> for BuildError {
+    fn from(error: env::VarError) -> Self {
+        BuildError::Env(error)
+    }
+}
 
-        (hours, minutes)
-    } else {
-        // Minutes not specified, assume 0
-        (time.parse::<u32>().unwrap(), 0)
+lazy_static! {
+    /// Regex to match timezone lines: "ABBR \t Description \t UTC±HH:MM"
+    static ref TIMEZONE_PATTERN: Regex =
+        Regex::new(r"([A-Z]+)\s\t.+\s\tUTC([−+±]\d{2}(?::\d{2})?)").unwrap();
+
+    /// Regex to parse UTC offset format: "±HH:MM" or "±HH"
+    static ref OFFSET_PATTERN: Regex =
+        Regex::new(r"([−+±])(\d{2})(?::(\d{2}))?").unwrap();
+}
+
+const SECONDS_PER_HOUR: i32 = 3600;
+const SECONDS_PER_MINUTE: i32 = 60;
+
+/// Parse a UTC offset string (e.g., "+05:30", "-08", "±00") into seconds from UTC
+fn parse_utc_offset(raw_offset: &str) -> Result<i32, BuildError> {
+    let captures = OFFSET_PATTERN.captures(raw_offset).ok_or_else(|| {
+        BuildError::Regex(format!("Failed to match offset pattern: {}", raw_offset))
+    })?;
+
+    // Handle ± (variable offset) as UTC
+    let sign = captures.get(1).unwrap().as_str();
+    if sign == "±" {
+        return Ok(0);
+    }
+
+    let hours_str = captures.get(2).unwrap().as_str();
+    let minutes_str = captures.get(3).map(|m| m.as_str()).unwrap_or("0");
+
+    let hours: i32 = hours_str
+        .parse()
+        .map_err(|e| BuildError::Parse(format!("Invalid hours '{}': {}", hours_str, e)))?;
+
+    let minutes: i32 = minutes_str
+        .parse()
+        .map_err(|e| BuildError::Parse(format!("Invalid minutes '{}': {}", minutes_str, e)))?;
+
+    // Validate ranges
+    if hours > 23 {
+        return Err(BuildError::Parse(format!("Hours out of range: {}", hours)));
+    }
+    if minutes > 59 {
+        return Err(BuildError::Parse(format!(
+            "Minutes out of range: {}",
+            minutes
+        )));
+    }
+
+    let total_seconds = (hours * SECONDS_PER_HOUR) + (minutes * SECONDS_PER_MINUTE);
+
+    // Apply sign (− is west/negative, + is east/positive)
+    Ok(match sign {
+        "−" => -total_seconds,
+        "+" => total_seconds,
+        _ => unreachable!("Regex should only match +, −, or ±"),
+    })
+}
+
+/// Parse a single timezone line and extract abbreviation and offset
+fn parse_timezone_line(line: &str) -> Result<Option<(String, i32)>, BuildError> {
+    // Skip comment lines
+    if line.trim().starts_with('#') || line.trim().is_empty() {
+        return Ok(None);
+    }
+
+    let captures = TIMEZONE_PATTERN
+        .captures(line)
+        .ok_or_else(|| BuildError::Regex(format!("Failed to match timezone pattern: {}", line)))?;
+
+    let abbreviation = match captures.get(1) {
+        Some(m) => m.as_str().to_string(),
+        None => {
+            return Err(BuildError::Regex(format!(
+                "Failed to extract abbreviation from line: {}",
+                line
+            )))
+        }
+    };
+    let raw_offset = match captures.get(2) {
+        Some(m) => m.as_str(),
+        None => {
+            return Err(BuildError::Regex(format!(
+                "Failed to extract offset from line: {}",
+                line
+            )))
+        }
     };
 
-    let value = (hours * HOUR) + (minutes * 60);
-    return if is_west { value as i32 * -1 } else { value as i32 };
+    let offset = parse_utc_offset(raw_offset)?;
+
+    Ok(Some((abbreviation, offset)))
+}
+
+/// Generate the PHF map code for timezone abbreviations to UTC offsets
+fn generate_timezone_map() -> Result<(), BuildError> {
+    let out_dir = env::var("OUT_DIR")?;
+    let output_path = Path::new(&out_dir).join("timezone_map.rs");
+
+    let tz_path = Path::new("./src/abbr_tz");
+    let tz_file = File::open(tz_path)?;
+    let reader = BufReader::new(tz_file);
+
+    let mut out_file = BufWriter::new(File::create(&output_path)?);
+    let mut builder = phf_codegen::Map::<String>::new();
+
+    let mut processed_count = 0;
+    let mut skipped_count = 0;
+
+    for line in reader.lines() {
+        let line = line?;
+
+        match parse_timezone_line(&line)? {
+            Some((abbreviation, offset)) => {
+                builder.entry(abbreviation.clone(), offset.to_string());
+                processed_count += 1;
+            }
+            None => {
+                skipped_count += 1;
+            }
+        }
+    }
+
+    // Generate the PHF map
+    writeln!(
+        &mut out_file,
+        "/// Auto-generated timezone abbreviation to UTC offset (in seconds) mapping"
+    )?;
+    writeln!(
+        &mut out_file,
+        "/// Generated from {} timezone definitions ({} processed, {} skipped)",
+        processed_count + skipped_count,
+        processed_count,
+        skipped_count
+    )?;
+    writeln!(
+        &mut out_file,
+        "pub static TIMEZONE_OFFSETS: phf::Map<&'static str, i32> = {};",
+        builder.build()
+    )?;
+
+    println!(
+        "cargo:warning=Generated timezone map with {} entries",
+        processed_count
+    );
+    Ok(())
 }
 
 fn main() {
-    let path = Path::new(&env::var("OUT_DIR").unwrap()).join("codegen.rs");
-    let raw_tz = BufReader::new(File::open("./src/abbr_tz").unwrap());
-
-    let mut file = BufWriter::new(File::create(&path).unwrap());
-
-    let mut builder: phf_codegen::Map<String> = phf_codegen::Map::new();
-
-    for line in raw_tz.lines() {
-        let line = line.unwrap();
-        if line.starts_with('#') {
-            continue;
+    if let Err(e) = generate_timezone_map() {
+        panic!("Build script failed: {}", e);
     }
 
-        let capture = FULL_PATTERN.captures(&line).expect("RegEx failed to match line");
-
-        let abbreviation = capture.get(1).unwrap().as_str();
-        let raw_offset = capture.get(2).unwrap().as_str();
-
-        let offset = if !raw_offset.starts_with('±') {
-            parse_offset(raw_offset)
-        } else {
-            0
-        };
-
-        builder.entry(String::from(abbreviation), &format!("\"{}\"", offset).to_string());
-    }
-
-    write!(
-        &mut file,
-        "static TIMEZONES: phf::Map<&'static str, &'static str> = {}",
-        builder.build()
-    )
-        .unwrap();
-    write!(&mut file, ";\n").unwrap();
+    // Tell Cargo to re-run this build script if the timezone file changes
+    println!("cargo:rerun-if-changed=src/abbr_tz");
 }

justfile

@@ -0,0 +1,115 @@
+# Variables
+image_name := "time-banner"
+container_name := "time-banner-dev"
+port := "3000"
+
+# Default recipe
+default:
+    @just --list
+
+# Development server with hot reload
+dev:
+    @echo "🚀 Starting development server..."
+    cargo watch -x "run --bin time-banner"
+
+# Simple development server (no hot reload)
+run:
+    @echo "🚀 Starting server..."
+    cargo run --bin time-banner
+
+# Comprehensive check pipeline
+check: format lint build test docker-build
+    @echo "✅ All checks passed!"
+
+# Format code
+format:
+    @echo "🎨 Formatting code..."
+    cargo fmt --all
+
+# Check formatting
+format-check:
+    @echo "🔍 Checking formatting..."
+    cargo fmt --all -- --check
+
+# Lint with clippy
+lint:
+    @echo "🔍 Running clippy..."
+    cargo clippy --all-targets --all-features --
+
+# Build project
+build:
+    @echo "🔨 Building project..."
+    cargo build --release
+
+# Run tests
+test:
+    @echo "🧪 Running tests..."
+    cargo test
+
+# Build Docker image
+docker-build:
+    @echo "🐳 Building Docker image..."
+    docker build -t {{image_name}}:latest .
+
+# Run Docker container
+docker-run: docker-build
+    @echo "🚀 Running Docker container..."
+    docker run --rm -d --name {{container_name}} -p {{port}}:{{port}} {{image_name}}:latest
+    @echo "Container started at http://localhost:{{port}}"
+
+# Stop Docker container
+docker-stop:
+    @echo "🛑 Stopping Docker container..."
+    docker stop {{container_name}} || true
+
+# Docker logs
+docker-logs:
+    @echo "📋 Showing Docker logs..."
+    docker logs {{container_name}}
+
+# Follow Docker logs
+docker-logs-follow:
+    @echo "📋 Following Docker logs..."
+    docker logs -f {{container_name}}
+
+# Clean Docker artifacts
+docker-clean: docker-stop
+    @echo "🧹 Cleaning Docker artifacts..."
+    docker rmi {{image_name}}:latest || true
+
+# Full Docker development cycle
+docker-dev: docker-clean docker-run
+    @echo "🐳 Docker development environment ready!"
+
+# Clean cargo artifacts
+clean:
+    @echo "🧹 Cleaning cargo artifacts..."
+    cargo clean
+
+# Install development dependencies
+install-deps:
+    @echo "📦 Installing development dependencies..."
+    cargo install cargo-watch
+
+# Security audit
+audit:
+    @echo "🔒 Running security audit..."
+    cargo audit
+
+# Check dependencies for updates
+outdated:
+    @echo "📅 Checking for outdated dependencies..."
+    cargo outdated
+
+# Release build with optimizations
+release:
+    @echo "🚀 Building release version..."
+    cargo build --release
+
+# Full CI pipeline (like what would run in CI)
+ci: format-check lint build test docker-build
+    @echo "🎯 CI pipeline completed!"
+
+# Quick development check (faster than full check)
+quick: format lint
+    @echo "⚡ Quick check completed!" 

src/abbr.rs

@@ -1,31 +0,0 @@
-use chrono::FixedOffset;
-
-// Generated by build.rs, phf_codegen
-include!(concat!(env!("OUT_DIR"), "/codegen.rs"));
-
-/*
-    Parse an abbreviation of a timezone into a UTC offset.
-    Note: This is not standardized at all and is simply built on a reference of Time Zone abbreviations
-    from Wikipedia (as of 2023-7-20).
- */
-pub fn parse_abbreviation(abbreviation: &str) -> Result<FixedOffset, String> {
-    let offset_integer_string = TIMEZONES.get(abbreviation);
-    if offset_integer_string.is_none() {
-        return Err("Failed to find abbreviation".to_string());
-    }
-
-    let offset = FixedOffset::east_opt(offset_integer_string.unwrap().parse().expect("Failed to parse stored offset"));
-    return offset.ok_or("Failed to parse offset".to_string());
-}
-
-
-#[cfg(test)]
-mod tests {
-    use chrono::FixedOffset;
-    use crate::abbr::parse_abbreviation;
-
-    #[test]
-    fn parse_offset() {
-        assert_eq!(parse_abbreviation("CST").unwrap(), FixedOffset::west_opt(6 * 3600).unwrap());
-    }
-}

src/abbr_tz.rs

@@ -0,0 +1,92 @@
+use chrono::FixedOffset;
+
+// Generated by build.rs - timezone abbreviation to UTC offset mapping
+include!(concat!(env!("OUT_DIR"), "/timezone_map.rs"));
+
+/// Parse a timezone abbreviation into a UTC offset.
+///
+/// This uses a pre-generated map of timezone abbreviations to their UTC offsets
+/// in seconds. The mapping is based on the Wikipedia reference of timezone
+/// abbreviations (as of 2023-07-20).
+///
+/// Note: Timezone abbreviations are not standardized and can be ambiguous.
+/// This implementation uses preferred interpretations for conflicting abbreviations.
+///
+/// # Arguments
+/// * `abbreviation` - The timezone abbreviation (e.g., "CST", "EST", "PST")
+///
+/// # Returns
+/// * `Ok(FixedOffset)` - The UTC offset for the timezone
+/// * `Err(String)` - Error message if abbreviation is not found or invalid
+///
+/// # Examples
+/// ```
+/// use chrono::FixedOffset;
+///
+/// let cst = parse_abbreviation("CST").unwrap();
+/// assert_eq!(cst, FixedOffset::west_opt(6 * 3600).unwrap());
+/// ```
+pub fn parse_abbreviation(abbreviation: &str) -> Result<FixedOffset, String> {
+    let offset_seconds = TIMEZONE_OFFSETS
+        .get(abbreviation)
+        .ok_or_else(|| format!("Unknown timezone abbreviation: {}", abbreviation))?;
+
+    // Convert seconds to FixedOffset
+    // Positive offsets are east of UTC, negative are west
+    let offset = if *offset_seconds >= 0 {
+        FixedOffset::east_opt(*offset_seconds)
+    } else {
+        FixedOffset::west_opt(-*offset_seconds)
+    };
+
+    offset.ok_or_else(|| {
+        format!(
+            "Invalid offset for timezone {}: {} seconds",
+            abbreviation, offset_seconds
+        )
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::abbr_tz::parse_abbreviation;
+    use chrono::FixedOffset;
+
+    #[test]
+    fn test_parse_cst() {
+        // CST (Central Standard Time) is UTC-6
+        let cst = parse_abbreviation("CST").unwrap();
+        assert_eq!(cst, FixedOffset::west_opt(6 * 3600).unwrap());
+    }
+
+    #[test]
+    fn test_parse_est() {
+        // EST (Eastern Standard Time) is UTC-5
+        let est = parse_abbreviation("EST").unwrap();
+        assert_eq!(est, FixedOffset::west_opt(5 * 3600).unwrap());
+    }
+
+    #[test]
+    fn test_parse_utc() {
+        // UTC should be zero offset
+        let utc = parse_abbreviation("UTC").unwrap();
+        assert_eq!(utc, FixedOffset::east_opt(0).unwrap());
+    }
+
+    #[test]
+    fn test_parse_unknown() {
+        // Unknown abbreviation should return error
+        let result = parse_abbreviation("INVALID");
+        assert!(result.is_err());
+        assert!(result
+            .unwrap_err()
+            .contains("Unknown timezone abbreviation"));
+    }
+
+    #[test]
+    fn test_parse_positive_offset() {
+        // JST (Japan Standard Time) is UTC+9
+        let jst = parse_abbreviation("JST").unwrap();
+        assert_eq!(jst, FixedOffset::east_opt(9 * 3600).unwrap());
+    }
+}

src/config.rs

@@ -1,6 +1,7 @@
 use serde::Deserialize;
 use tracing::Level;
 
+/// Application environment configuration.
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "lowercase")]
 pub enum Environment {
@@ -8,6 +9,11 @@ pub enum Environment {
     Development,
 }
 
+/// Main configuration struct parsed from environment variables.
+///
+/// Environment variables:
+/// - `ENV`: "production" or "development" (default: development)
+/// - `PORT`: TCP port number (default: 3000)
 #[derive(Deserialize, Debug)]
 pub struct Configuration {
     #[serde(default = "default_env")]
@@ -26,6 +32,10 @@ fn default_env() -> Environment {
 }
 
 impl Configuration {
+    /// Returns the socket address to bind to based on environment.
+    ///
+    /// - Production: 0.0.0.0 (all interfaces)
+    /// - Development: 127.0.0.1 (localhost only)
     pub fn socket_addr(&self) -> [u8; 4] {
         match self.env {
             Environment::Production => {
@@ -49,6 +59,10 @@ impl Configuration {
         }
     }
 
+    /// Returns the appropriate log level for the environment.
+    ///
+    /// - Production: INFO
+    /// - Development: DEBUG
     pub fn log_level(&self) -> Level {
         match self.env {
             Environment::Production => Level::INFO,

src/duration.rs

@@ -0,0 +1,326 @@
+//! Human-readable duration parsing with support for mixed time units.
+//!
+//! Parses strings like "1y2mon3w4d5h6m7s", "+1year", or "-3h30m" into chrono Duration objects.
+//! Time units can appear in any order and use various abbreviations.
+
+use chrono::{DateTime, Duration, Utc};
+use lazy_static::lazy_static;
+use regex::Regex;
+
+use crate::error::TimeBannerError;
+
+/// Extends chrono::Duration with month support using approximate calendar math.
+pub trait Months {
+    fn months(count: i32) -> Self;
+}
+
+impl Months for Duration {
+    /// Creates a duration representing the given number of months.
+    /// Uses 365.25/12 ≈ 30.44 days per month for approximation.
+    fn months(count: i32) -> Self {
+        Duration::milliseconds(
+            (Duration::days(1).num_milliseconds() as f64 * (365.25f64 / 12f64)) as i64,
+        ) * count
+    }
+}
+
+lazy_static! {
+    /// Regex pattern matching duration strings with flexible ordering and abbreviations.
+    ///
+    /// Supports:
+    /// - Optional +/- sign
+    /// - Years: y, yr, yrs, year, years
+    /// - Months: mon, month, months
+    /// - Weeks: w, wk, wks, week, weeks
+    /// - Days: d, day, days
+    /// - Hours: h, hr, hrs, hour, hours
+    /// - Minutes: m, min, mins, minute, minutes
+    /// - Seconds: s, sec, secs, second, seconds
+    ///
+    /// Time units must appear in descending order of magnitude, e.g. "1y2d" is valid, "1d2y" is not.
+    static ref FULL_RELATIVE_PATTERN: Regex = Regex::new(concat!(
+        "(?<sign>[-+])?",
+        r"(?:(?<year>\d+)\s?(?:years?|yrs?|y)\s*)?",
+        r"(?:(?<month>\d+)\s?(?:months?|mon)\s*)?",
+        r"(?:(?<week>\d+)\s?(?:weeks?|wks?|w)\s*)?",
+        r"(?:(?<day>\d+)\s?(?:days?|d)\s*)?",
+        r"(?:(?<hour>\d+)\s?(?:hours?|hrs?|h)\s*)?",
+        r"(?:(?<minute>\d+)\s?(?:minutes?|mins?|m)\s*)?",
+        r"(?:(?<second>\d+)\s?(?:seconds?|secs?|s)\s*)?"
+    ))
+    .unwrap();
+}
+
+/// Parses a human-readable duration string into a chrono Duration.
+///
+/// Examples:
+/// - `"1y2d"` → 1 year + 2 days  
+/// - `"+3h30m"` → +3.5 hours
+/// - `"-1week"` → -7 days
+/// - `"2months4days"` → ~2.03 months
+///
+/// Years include leap year compensation (+6 hours per year).
+/// Empty strings return zero duration.
+pub fn parse_duration(str: &str) -> Result<Duration, String> {
+    let capture = FULL_RELATIVE_PATTERN.captures(str).unwrap();
+    let mut value = Duration::zero();
+
+    if let Some(raw_year) = capture.name("year") {
+        value += match raw_year.as_str().parse::<i64>() {
+            Ok(year) => {
+                Duration::days(year * 365)
+                    + (if year > 0 {
+                        Duration::hours(6) * year as i32 // Leap year compensation
+                    } else {
+                        Duration::zero()
+                    })
+            }
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse year from {} ({})",
+                    raw_year.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_month) = capture.name("month") {
+        value += match raw_month.as_str().parse::<i32>() {
+            Ok(month) => Duration::months(month),
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse month from {} ({})",
+                    raw_month.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_week) = capture.name("week") {
+        value += match raw_week.as_str().parse::<i64>() {
+            Ok(week) => Duration::days(7) * week as i32,
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse week from {} ({})",
+                    raw_week.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_day) = capture.name("day") {
+        value += match raw_day.as_str().parse::<i64>() {
+            Ok(day) => Duration::days(day),
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse day from {} ({})",
+                    raw_day.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_hour) = capture.name("hour") {
+        value += match raw_hour.as_str().parse::<i64>() {
+            Ok(hour) => Duration::hours(hour),
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse hour from {} ({})",
+                    raw_hour.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_minute) = capture.name("minute") {
+        value += match raw_minute.as_str().parse::<i64>() {
+            Ok(minute) => Duration::minutes(minute),
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse minute from {} ({})",
+                    raw_minute.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_second) = capture.name("second") {
+        value += match raw_second.as_str().parse::<i64>() {
+            Ok(second) => Duration::seconds(second),
+            Err(e) => {
+                return Err(format!(
+                    "Could not parse second from {} ({})",
+                    raw_second.as_str(),
+                    e
+                ))
+            }
+        };
+    }
+
+    if let Some(raw_sign) = capture.name("sign") {
+        match raw_sign.as_str() {
+            "-" => value = -value,
+            "+" => (),
+            _ => return Err(format!("Could not parse sign from {}", raw_sign.as_str())),
+        };
+    }
+
+    Ok(value)
+}
+
+/// Converts Unix epoch timestamp to UTC DateTime.
+pub fn parse_epoch_into_datetime(epoch: i64) -> Option<DateTime<Utc>> {
+    DateTime::from_timestamp(epoch, 0)
+}
+
+/// Parses various time value formats into a UTC datetime.
+///
+/// Supports:
+/// - Relative offsets: "+3600", "-1800" (seconds from now)
+/// - Duration strings: "+1y2d", "-3h30m" (using duration parser)
+/// - Epoch timestamps: "1752170474" (Unix timestamp)
+pub fn parse_time_value(raw_time: &str) -> Result<DateTime<Utc>, TimeBannerError> {
+    // Handle relative time values (starting with + or -, or duration strings like "1y2d")
+    if raw_time.starts_with('+') || raw_time.starts_with('-') {
+        let now = Utc::now();
+
+        // Try parsing as simple offset seconds first
+        if let Ok(offset_seconds) = raw_time.parse::<i64>() {
+            return Ok(now + Duration::seconds(offset_seconds));
+        }
+
+        // Try parsing as duration string (e.g., "+1y2d", "-3h30m")
+        if let Ok(duration) = parse_duration(raw_time) {
+            return Ok(now + duration);
+        }
+
+        return Err(TimeBannerError::ParseError(format!(
+            "Could not parse relative time: {}",
+            raw_time
+        )));
+    }
+
+    // Try to parse as epoch timestamp
+    if let Ok(epoch) = raw_time.parse::<i64>() {
+        return parse_epoch_into_datetime(epoch)
+            .ok_or_else(|| TimeBannerError::ParseError("Invalid timestamp".to_string()));
+    }
+
+    Err(TimeBannerError::ParseError(format!(
+        "Could not parse time value: {}",
+        raw_time
+    )))
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::duration::{parse_duration, Months};
+    use chrono::Duration;
+
+    #[test]
+    fn parse_empty() {
+        assert_eq!(parse_duration(""), Ok(Duration::zero()));
+        assert_eq!(parse_duration(" "), Ok(Duration::zero()));
+        assert_eq!(parse_duration("  "), Ok(Duration::zero()));
+    }
+
+    #[test]
+    fn parse_composite() {
+        assert_eq!(
+            parse_duration("1y2mon3w4d5h6m7s"),
+            Ok(Duration::days(365)
+                + Duration::hours(6) // leap year compensation
+                + Duration::months(2)
+                + Duration::weeks(3)
+                + Duration::days(4)
+                + Duration::hours(5)
+                + Duration::minutes(6)
+                + Duration::seconds(7)),
+            "1y2mon3w4d5h6m7s"
+        );
+        assert_eq!(
+            parse_duration("19year33weeks4d9min"),
+            Ok(Duration::days(365 * 19)
+                + Duration::hours(6 * 19)
+                + Duration::days(33 * 7 + 4)
+                + Duration::minutes(9)),
+            "19year33weeks4d9min"
+        );
+    }
+
+    #[test]
+    fn parse_year() {
+        assert_eq!(
+            parse_duration("1y"),
+            Ok(Duration::days(365) + Duration::hours(6))
+        );
+        assert_eq!(
+            parse_duration("2year"),
+            Ok(Duration::days(365 * 2) + Duration::hours(6 * 2))
+        );
+        assert_eq!(
+            parse_duration("144years"),
+            Ok(Duration::days(365 * 144) + Duration::hours(6 * 144))
+        );
+    }
+
+    #[test]
+    fn parse_month() {
+        assert_eq!(Duration::zero(), parse_duration("0mon").unwrap());
+        assert_eq!(Duration::months(3), parse_duration("3mon").unwrap());
+        assert_eq!(Duration::months(-14), parse_duration("-14mon").unwrap());
+        assert_eq!(Duration::months(144), parse_duration("+144months").unwrap());
+    }
+
+    #[test]
+    fn parse_week() {
+        assert_eq!(Duration::zero(), parse_duration("0w").unwrap());
+        assert_eq!(Duration::weeks(7), parse_duration("7w").unwrap());
+        assert_eq!(Duration::weeks(19), parse_duration("19week").unwrap());
+        assert_eq!(Duration::weeks(433), parse_duration("433weeks").unwrap());
+    }
+
+    #[test]
+    fn parse_day() {
+        assert_eq!(Duration::zero(), parse_duration("0d").unwrap());
+        assert_eq!(Duration::days(9), parse_duration("9d").unwrap());
+        assert_eq!(Duration::days(43), parse_duration("43day").unwrap());
+        assert_eq!(Duration::days(969), parse_duration("969days").unwrap());
+    }
+
+    #[test]
+    fn parse_hour() {
+        assert_eq!(Duration::zero(), parse_duration("0h").unwrap());
+        assert_eq!(Duration::hours(4), parse_duration("4h").unwrap());
+        assert_eq!(Duration::hours(150), parse_duration("150hour").unwrap());
+        assert_eq!(Duration::hours(777), parse_duration("777hours").unwrap());
+    }
+
+    #[test]
+    fn parse_minute() {
+        assert_eq!(Duration::zero(), parse_duration("0m").unwrap());
+        assert_eq!(Duration::minutes(5), parse_duration("5m").unwrap());
+        assert_eq!(Duration::minutes(60), parse_duration("60min").unwrap());
+        assert_eq!(
+            Duration::minutes(999),
+            parse_duration("999minutes").unwrap()
+        );
+    }
+
+    #[test]
+    fn parse_second() {
+        assert_eq!(Duration::zero(), parse_duration("0s").unwrap());
+        assert_eq!(Duration::seconds(6), parse_duration("6s").unwrap());
+        assert_eq!(Duration::minutes(1), parse_duration("60sec").unwrap());
+        assert_eq!(
+            Duration::seconds(999),
+            parse_duration("999seconds").unwrap()
+        );
+    }
+}

src/error.rs

@@ -1,27 +1,61 @@
-use axum::body::Full;
-use axum::http::{StatusCode};
-use axum::Json;
-use axum::response::{IntoResponse, Response};
-use serde::{Serialize, Deserialize};
+use axum::{http::StatusCode, response::Json};
+use serde::Serialize;
 
+/// Application-specific errors that can occur during request processing.
+#[derive(Debug)]
 pub enum TimeBannerError {
+    /// Input parsing errors (invalid time formats, bad parameters, etc.)
     ParseError(String),
+    /// Template rendering failures
     RenderError(String),
+    /// SVG to PNG conversion failures  
     RasterizeError(String),
+    /// 404 Not Found
+    NotFound,
 }
 
-#[derive(Serialize, Deserialize)]
+/// JSON error response format for HTTP clients.
+#[derive(Serialize)]
 pub struct ErrorResponse {
-    code: u16,
+    error: String,
     message: String,
 }
 
+/// Converts application errors into standardized HTTP responses with JSON bodies.
+///
+/// Returns appropriate status codes:
+/// - 400 Bad Request: ParseError
+/// - 500 Internal Server Error: RenderError, RasterizeError  
+/// - 404 Not Found: NotFound
 pub fn get_error_response(error: TimeBannerError) -> (StatusCode, Json<ErrorResponse>) {
-    let (code, message) = match error {
-        TimeBannerError::RenderError(msg) => (StatusCode::INTERNAL_SERVER_ERROR, format!("RenderError :: {}", msg)),
-        TimeBannerError::ParseError(msg) => (StatusCode::BAD_REQUEST, format!("ParserError :: {}", msg)),
-        TimeBannerError::RasterizeError(msg) => (StatusCode::INTERNAL_SERVER_ERROR, format!("RasertizeError :: {}", msg))
-    };
-
-    (code, Json(ErrorResponse { code: code.as_u16(), message }))
+    match error {
+        TimeBannerError::ParseError(msg) => (
+            StatusCode::BAD_REQUEST,
+            Json(ErrorResponse {
+                error: "ParseError".to_string(),
+                message: msg,
+            }),
+        ),
+        TimeBannerError::RenderError(msg) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(ErrorResponse {
+                error: "RenderError".to_string(),
+                message: msg,
+            }),
+        ),
+        TimeBannerError::RasterizeError(msg) => (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(ErrorResponse {
+                error: "RasterizeError".to_string(),
+                message: msg,
+            }),
+        ),
+        TimeBannerError::NotFound => (
+            StatusCode::NOT_FOUND,
+            Json(ErrorResponse {
+                error: "NotFound".to_string(),
+                message: "The requested resource was not found".to_string(),
+            }),
+        ),
+    }
 }

src/main.rs

@@ -1,43 +1,67 @@
 use std::net::SocketAddr;
 
-use axum::{Router, routing::get};
-use dotenvy::dotenv;
+use crate::routes::{
+    absolute_handler, fallback_handler, favicon_handler, favicon_png_handler, implicit_handler,
+    index_handler, relative_handler,
+};
+use axum::{http::HeaderValue, response::Response, routing::get, Router};
 use config::Configuration;
-use crate::routes::{relative_handler, implicit_handler, absolute_handler};
+use dotenvy::dotenv;
 
+mod abbr_tz;
 mod config;
-mod raster;
-mod abbr;
-mod routes;
-mod parse;
-mod template;
+mod duration;
 mod error;
-
+mod raster;
+mod render;
+mod routes;
+mod template;
+mod utils;
 
 #[tokio::main]
 async fn main() {
-    // Parse dotenv files and expose them as environment variables
+    // Development-only: Parse dotenv files and expose them as environment variables
+    #[cfg(debug_assertions)]
     dotenv().ok();
 
-    // envy uses our Configuration struct to parse environment variables
-    let config = envy::from_env::<Configuration>().expect("Please provide PORT env var");
+    // Envy uses our Configuration struct to parse environment variables
+    let config = envy::from_env::<Configuration>().expect("Failed to parse environment variables");
 
-    // initialize tracing
+    // Initialize tracing
     tracing_subscriber::fmt()
         // With the log_level from our config
         .with_max_level(config.log_level())
         .init();
 
     let app = Router::new()
-        .route("/:path", get(implicit_handler))
-        .route("/rel/:path", get(relative_handler))
-        .route("/relative/:path", get(relative_handler))
-        .route("/absolute/:path", get(absolute_handler))
-        .route("/abs/:path", get(absolute_handler));
+        .route("/", get(index_handler))
+        .route("/favicon.ico", get(favicon_handler))
+        .route("/favicon.png", get(favicon_png_handler))
+        .route("/{path}", get(implicit_handler))
+        .route("/rel/{path}", get(relative_handler))
+        .route("/relative/{path}", get(relative_handler))
+        .route("/absolute/{path}", get(absolute_handler))
+        .route("/abs/{path}", get(absolute_handler))
+        .fallback(fallback_handler)
+        .layer(axum::middleware::map_response(add_server_header));
 
     let addr = SocketAddr::from((config.socket_addr(), config.port));
-    axum::Server::bind(&addr)
-        .serve(app.into_make_service_with_connect_info::<SocketAddr>())
+    axum::serve(
+        tokio::net::TcpListener::bind(addr).await.unwrap(),
+        app.into_make_service_with_connect_info::<SocketAddr>(),
+    )
     .await
     .unwrap();
 }
+
+/// Middleware to add server header with application version
+async fn add_server_header(mut response: Response) -> Response {
+    let version = env!("CARGO_PKG_VERSION");
+    let server_header = format!("time-banner/{}", version);
+
+    if let Ok(header_value) = HeaderValue::from_str(&server_header) {
+        response.headers_mut().insert("Server", header_value);
+    }
+
+    response
+}

src/parse.rs

@@ -1,26 +0,0 @@
-use chrono::{DateTime, FixedOffset, Utc};
-
-/// Split a path into a tuple of the preceding path and the extension.
-/// Can handle paths with multiple dots (period characters).
-/// Returns None if there is no extension.
-/// Returns None if the preceding path is empty (for example, dotfiles like ".env").
-pub fn split_on_extension(path: &str) -> Option<(&str, &str)> {
-    let split = path.rsplit_once('.');
-    if split.is_none() { return None; }
-
-    // Check that the file is not a dotfile (.env)
-    if split.unwrap().0.len() == 0 {
-        return None;
-    }
-
-    Some(split.unwrap())
-}
-
-pub fn parse_absolute(raw: String) -> Result<(DateTime<Utc>, FixedOffset), String> {
-    let datetime_with_offset = DateTime::parse_from_rfc3339(&raw);
-    if datetime_with_offset.is_err() {
-        return Err("Failed to parse datetime".to_string());
-    }
-
-    Ok((datetime_with_offset.unwrap().with_timezone(&Utc), *(datetime_with_offset.unwrap().offset())))
-}

src/raster.rs

@@ -1,6 +1,7 @@
+use resvg::usvg::fontdb;
 use resvg::{tiny_skia, usvg};
-use resvg::usvg::{fontdb, TreeParsing, TreeTextToPath};
 
+/// Errors that can occur during SVG rasterization.
 #[derive(Debug, Clone)]
 pub struct RenderError {
     pub message: Option<String>,
@@ -21,34 +22,53 @@ pub struct Rasterizer {
 }
 
 impl Rasterizer {
+    /// Creates a new rasterizer and loads available fonts.
     pub fn new() -> Self {
         let mut fontdb = fontdb::Database::new();
         fontdb.load_system_fonts();
-        fontdb.load_fonts_dir("./fonts");
+        fontdb.load_fonts_dir(if cfg!(debug_assertions) {
+            "src/fonts"
+        } else {
+            "fonts"
+        });
 
-        Self {
-            font_db: fontdb
-        }
+        Self { font_db: fontdb }
     }
 
+    /// Converts SVG data to PNG.
     pub fn render(&self, svg_data: Vec<u8>) -> Result<Vec<u8>, RenderError> {
         let tree = {
-            let opt = usvg::Options::default();
-            let mut tree_result = usvg::Tree::from_data(&*svg_data, &opt);
-            if tree_result.is_err() { return Err(RenderError { message: Some("Failed to parse".to_string()) }); }
+            let opt = usvg::Options {
+                fontdb: std::sync::Arc::new(self.font_db.clone()),
+                ..Default::default()
+            };
+            let tree_result = usvg::Tree::from_data(&svg_data, &opt);
+            if tree_result.is_err() {
+                return Err(RenderError {
+                    message: Some("Failed to parse".to_string()),
+                });
+            }
 
-            let tree = tree_result.as_mut().unwrap();
-            tree.convert_text(&self.font_db);
-
-            resvg::Tree::from_usvg(&tree)
+            tree_result.unwrap()
         };
 
-        let pixmap_size = tree.size.to_int_size();
+        let pixmap_size = tree.size().to_int_size();
         let mut pixmap = tiny_skia::Pixmap::new(pixmap_size.width(), pixmap_size.height()).unwrap();
-        tree.render(tiny_skia::Transform::default(), &mut pixmap.as_mut());
 
-        pixmap
-            .encode_png()
-            .map_err(|_| RenderError { message: Some("Failed to encode".to_string()) })
+        // Calculate center point for scaling
+        let center_x = pixmap_size.width() as f32 / 2.0;
+        let center_y = pixmap_size.height() as f32 / 2.0;
+
+        // Create transform that scales from center: translate to center, scale, translate back
+        let zoom = 0.90; // 10% zoom out from center
+        let render_ts = tiny_skia::Transform::from_translate(-center_x, -center_y)
+            .post_scale(zoom, zoom)
+            .post_translate(center_x, center_y);
+
+        resvg::render(&tree, render_ts, &mut pixmap.as_mut());
+
+        pixmap.encode_png().map_err(|_| RenderError {
+            message: Some("Failed to encode".to_string()),
+        })
     }
 }

src/render.rs

@@ -0,0 +1,153 @@
+use crate::error::{get_error_response, TimeBannerError};
+use crate::raster::Rasterizer;
+use crate::template::{render_template, OutputForm, RenderContext};
+use axum::body::Bytes;
+use axum::http::{header, StatusCode};
+use axum::response::IntoResponse;
+use chrono::{DateTime, Utc};
+use std::io::Cursor;
+
+/// Output format for rendered time banners.
+#[derive(Debug, Clone)]
+pub enum OutputFormat {
+    Svg,
+    Png,
+}
+
+impl OutputFormat {
+    /// Determines output format from file extension. Defaults to SVG for unknown extensions.
+    pub fn from_extension(ext: &str) -> Self {
+        match ext {
+            "png" => OutputFormat::Png,
+            _ => OutputFormat::Svg, // Default to SVG
+        }
+    }
+
+    pub fn from_mime_type(mime_type: &str) -> Self {
+        // TODO: Support mime types dynamically, proper header parsing
+        match mime_type {
+            "image/svg+xml" => OutputFormat::Svg,
+            "image/png" => OutputFormat::Png,
+            _ => OutputFormat::Svg, // Default to SVG
+        }
+    }
+
+    /// Returns the appropriate MIME type for HTTP responses.
+    pub fn mime_type(&self) -> &'static str {
+        match self {
+            OutputFormat::Svg => "image/svg+xml",
+            OutputFormat::Png => "image/png",
+        }
+    }
+}
+
+/// Converts SVG to the requested format. PNG requires rasterization.
+pub fn handle_rasterize(data: String, format: &OutputFormat) -> Result<Bytes, TimeBannerError> {
+    match format {
+        OutputFormat::Svg => Ok(Bytes::from(data)),
+        OutputFormat::Png => {
+            let renderer = Rasterizer::new();
+            let raw_image = renderer.render(data.into_bytes());
+            if let Err(err) = raw_image {
+                return Err(TimeBannerError::RasterizeError(
+                    err.message.unwrap_or_else(|| "Unknown error".to_string()),
+                ));
+            }
+            Ok(Bytes::from(raw_image.unwrap()))
+        }
+    }
+}
+
+/// Main rendering pipeline: template → SVG → optional rasterization → HTTP response.
+///
+/// Takes a timestamp, display format, and file extension, then:
+/// 1. Renders the time using a template
+/// 2. Converts to the requested format (SVG or PNG)  
+/// 3. Returns an HTTP response with appropriate headers
+pub fn render_time_response(
+    time: DateTime<Utc>,
+    output_form: OutputForm,
+    extension: &str,
+) -> impl IntoResponse {
+    let output_format = OutputFormat::from_extension(extension);
+
+    // Build context for rendering
+    let context = RenderContext {
+        value: time,
+        output_form,
+        output_format: output_format.clone(),
+        timezone: None, // Default to UTC for now
+        format: None,   // Use default format
+        now: None,      // Use current time
+    };
+
+    // Render template
+    let rendered_template = match render_template(context) {
+        Ok(template) => template,
+        Err(e) => {
+            return get_error_response(TimeBannerError::RenderError(format!(
+                "Template rendering failed: {}",
+                e
+            )))
+            .into_response()
+        }
+    };
+
+    // Handle rasterization
+    match handle_rasterize(rendered_template, &output_format) {
+        Ok(bytes) => (
+            StatusCode::OK,
+            [(header::CONTENT_TYPE, output_format.mime_type())],
+            bytes,
+        )
+            .into_response(),
+        Err(e) => get_error_response(e).into_response(),
+    }
+}
+
+/// Generates PNG bytes for the favicon clock.
+pub fn generate_favicon_png_bytes(time: DateTime<Utc>) -> Result<Vec<u8>, TimeBannerError> {
+    // Build context for rendering
+    let context = RenderContext {
+        value: time,
+        output_form: OutputForm::Clock,
+        output_format: OutputFormat::Png,
+        timezone: None,
+        format: None,
+        now: None,
+    };
+
+    // Render template to SVG
+    let rendered_template = render_template(context)
+        .map_err(|e| TimeBannerError::RenderError(format!("Template rendering failed: {}", e)))?;
+
+    // Convert SVG to PNG
+    let png_bytes = handle_rasterize(rendered_template, &OutputFormat::Png)?;
+
+    Ok(png_bytes.to_vec())
+}
+
+/// Converts PNG bytes to ICO format using the ico crate.
+pub fn convert_png_to_ico(png_bytes: &[u8]) -> Result<Bytes, String> {
+    // Create a new, empty icon collection
+    let mut icon_dir = ico::IconDir::new(ico::ResourceType::Icon);
+
+    // Read PNG data from bytes
+    let cursor = Cursor::new(png_bytes);
+    let image =
+        ico::IconImage::read_png(cursor).map_err(|e| format!("Failed to read PNG data: {}", e))?;
+
+    // Add the image to the icon collection
+    icon_dir.add_entry(
+        ico::IconDirEntry::encode(&image)
+            .map_err(|e| format!("Failed to encode icon entry: {}", e))?,
+    );
+
+    // Write ICO data to a buffer
+    let mut ico_buffer = Vec::new();
+    icon_dir
+        .write(&mut ico_buffer)
+        .map_err(|e| format!("Failed to write ICO data: {}", e))?;
+
+    Ok(Bytes::from(ico_buffer))
+}

src/routes.rs

@@ -1,92 +1,110 @@
-use axum::{http::StatusCode, response::IntoResponse};
-use axum::body::{Bytes, Full};
-use axum::extract::{Path};
-use axum::http::{header};
-use axum::response::Response;
-use chrono::{DateTime, NaiveDateTime, Offset, Utc};
+use crate::duration::parse_time_value;
 use crate::error::{get_error_response, TimeBannerError};
+use crate::render::{convert_png_to_ico, generate_favicon_png_bytes, render_time_response};
+use crate::template::OutputForm;
+use crate::utils::parse_path;
+use axum::extract::ConnectInfo;
+use axum::extract::Path;
+use axum::http::{header, StatusCode};
+use axum::response::IntoResponse;
+use std::net::SocketAddr;
 
+/// Root handler - redirects to current time in relative format.
+pub async fn index_handler() -> impl IntoResponse {
+    let epoch_now = chrono::Utc::now().timestamp();
 
-use crate::parse::split_on_extension;
-use crate::raster::Rasterizer;
-use crate::template::{OutputForm, render_template, RenderContext};
-
-
-fn parse_path(path: &str) -> (&str, &str) {
-    split_on_extension(path)
-        .or_else(|| Some((path, "svg")))
-        .unwrap()
-}
-
-fn handle_rasterize(data: String, extension: &str) -> Result<(&str, Bytes), TimeBannerError> {
-    match extension {
-        "svg" => Ok(("image/svg+xml", Bytes::from(data))),
-        "png" => {
-            let renderer = Rasterizer::new();
-            let raw_image = renderer.render(data.into_bytes());
-            if raw_image.is_err() {
-                return Err(TimeBannerError::RasterizeError(raw_image.unwrap_err().message.unwrap_or("Unknown error".to_string())));
-            }
-
-            Ok(("image/x-png", Bytes::from(raw_image.unwrap())))
-        }
-        _ => Err(TimeBannerError::ParseError(format!("Unsupported extension: {}", extension)))
-    }
+    axum::response::Redirect::temporary(&format!("/relative/{epoch_now}")).into_response()
 }
 
+/// Handles `/relative/{time}` - displays time in relative format ("2 hours ago").
 pub async fn relative_handler(Path(path): Path<String>) -> impl IntoResponse {
-    let (raw_time, extension) = parse_path(path.as_str());
-}
+    let (raw_time, extension) = parse_path(&path);
 
-pub async fn absolute_handler(Path(path): Path<String>) -> impl IntoResponse {
-    let (raw_time, extension) = parse_path(path.as_str());
-}
-
-
-// basic handler that responds with a static string
-pub async fn implicit_handler(Path(path): Path<String>) -> impl IntoResponse {
-    // Get extension if available
-    let (raw_time, extension) = parse_path(path.as_str());
-
-    // Parse epoch
-    let parsed_epoch = raw_time.parse::<i64>();
-    if parsed_epoch.is_err() {
-        return get_error_response(TimeBannerError::ParseError("Input could not be parsed into integer.".to_string())).into_response();
-    }
-
-    // Convert epoch to DateTime
-    let naive_time = NaiveDateTime::from_timestamp_opt(parsed_epoch.unwrap(), 0);
-    if naive_time.is_none() {
-        return get_error_response(TimeBannerError::ParseError("Input was not a valid DateTime".to_string())).into_response();
-    }
-
-    let utc_time = DateTime::<Utc>::from_utc(naive_time.unwrap(), Utc);
-
-    // Build context for rendering
-    let context = RenderContext {
-        output_form: OutputForm::Relative,
-        value: utc_time,
-        tz_offset: utc_time.offset().fix(),
-        tz_name: "UTC",
-        view: "basic",
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
     };
 
-    let rendered_template = render_template(context);
+    render_time_response(time, OutputForm::Relative, extension).into_response()
+}
 
-    if rendered_template.is_err() {
-        return Response::builder()
-            .status(StatusCode::INTERNAL_SERVER_ERROR)
-            .body(Full::from(
-                format!("Template Could Not Be Rendered :: {}", rendered_template.err().unwrap())
-            ))
-            .unwrap().into_response();
-    }
+/// Handles `/absolute/{time}` - displays time in absolute format ("2025-01-17 14:30:00 UTC").
+pub async fn absolute_handler(Path(path): Path<String>) -> impl IntoResponse {
+    let (raw_time, extension) = parse_path(&path);
 
-    let rasterize_result = handle_rasterize(rendered_template.unwrap(), extension);
-    match rasterize_result {
-        Ok((mime_type, bytes)) => {
-            (StatusCode::OK, [(header::CONTENT_TYPE, mime_type)], bytes).into_response()
-        }
-        Err(e) => get_error_response(e).into_response()
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    render_time_response(time, OutputForm::Absolute, extension).into_response()
+}
+
+/// Handles `/{time}` - implicit absolute time display (same as absolute_handler).
+pub async fn implicit_handler(Path(path): Path<String>) -> impl IntoResponse {
+    let (raw_time, extension) = parse_path(&path);
+
+    let time = match parse_time_value(raw_time) {
+        Ok(t) => t,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    render_time_response(time, OutputForm::Absolute, extension).into_response()
+}
+
+/// Handles `/favicon.ico` - generates a dynamic clock favicon showing the current time.
+///
+/// Logs the client IP address and returns an ICO image of an analog clock.
+pub async fn favicon_handler(ConnectInfo(addr): ConnectInfo<SocketAddr>) -> impl IntoResponse {
+    let now = chrono::Utc::now();
+
+    // Log the IP address for the favicon request
+    tracing::info!("Favicon request from IP: {}", addr.ip());
+
+    // Generate PNG bytes directly for conversion
+    let png_bytes = match generate_favicon_png_bytes(now) {
+        Ok(bytes) => bytes,
+        Err(e) => return get_error_response(e).into_response(),
+    };
+
+    // Convert PNG to ICO using the ico crate
+    match convert_png_to_ico(&png_bytes) {
+        Ok(ico_bytes) => (
+            StatusCode::OK,
+            [(header::CONTENT_TYPE, "image/x-icon")],
+            ico_bytes,
+        )
+            .into_response(),
+        Err(e) => get_error_response(TimeBannerError::RenderError(format!(
+            "Failed to convert PNG to ICO: {}",
+            e
+        )))
+        .into_response(),
     }
 }
+
+/// Handles `/favicon.png` - generates a dynamic clock favicon showing the current time.
+///
+/// Logs the client IP address and returns a PNG image of an analog clock.
+pub async fn favicon_png_handler(ConnectInfo(addr): ConnectInfo<SocketAddr>) -> impl IntoResponse {
+    let now = chrono::Utc::now();
+
+    // Log the IP address for the favicon request
+    tracing::info!("Favicon PNG request from IP: {}", addr.ip());
+
+    // Generate PNG bytes directly
+    match generate_favicon_png_bytes(now) {
+        Ok(png_bytes) => (
+            StatusCode::OK,
+            [(header::CONTENT_TYPE, "image/png")],
+            png_bytes,
+        )
+            .into_response(),
+        Err(e) => get_error_response(e).into_response(),
+    }
+}
+
+/// Fallback handler for unmatched routes.
+pub async fn fallback_handler() -> impl IntoResponse {
+    get_error_response(TimeBannerError::NotFound).into_response()
+}

src/template.rs

@@ -1,47 +1,129 @@
-use chrono::{DateTime, FixedOffset, Utc};
-use timeago::Formatter;
-use tera::{Context, Tera};
+use chrono::{DateTime, Timelike, Utc};
 use lazy_static::lazy_static;
+use tera::{Context, Tera};
+use timeago::Formatter;
+
+use crate::render::OutputFormat;
 
 lazy_static! {
+    /// Global Tera template engine instance.
     static ref TEMPLATES: Tera = {
-        let mut _tera = match Tera::new("templates/**/*.svg") {
+        let template_pattern = if cfg!(debug_assertions) {
+            // Development: templates are in src/templates
+            "src/templates/**/*.svg"
+        } else {
+            // Production: templates are in /usr/src/app/templates (relative to working dir)
+            "templates/**/*.svg"
+        };
+
+        match Tera::new(template_pattern) {
             Ok(t) => {
                 let names: Vec<&str> = t.get_template_names().collect();
                 println!("{} templates found ([{}]).", names.len(), names.join(", "));
                 t
-            },
+            }
             Err(e) => {
                 println!("Parsing error(s): {}", e);
                 ::std::process::exit(1);
             }
-        };
-        _tera
+        }
     };
 }
 
+/// Display format for time values.
 pub enum OutputForm {
+    /// Relative display: "2 hours ago", "in 3 days"
     Relative,
+    /// Absolute display: "2025-01-17 14:30:00 UTC"  
     Absolute,
+    /// Clock display: analog clock with hands showing the time
+    Clock,
 }
 
-pub struct RenderContext<'a> {
-    pub output_form: OutputForm,
+/// Timezone specification formats (currently unused but reserved for future features).
+pub enum TzForm {
+    Abbreviation(String), // e.g. "CST"
+    Iso(String),          // e.g. "America/Chicago"
+    Offset(i32),          // e.g. "-0600" as -21600
+}
+
+/// Context passed to template renderer containing all necessary data.
+pub struct RenderContext {
     pub value: DateTime<Utc>,
-    pub tz_offset: FixedOffset,
-    pub tz_name: &'a str,
-    pub view: &'a str,
+    pub output_form: OutputForm,
+    pub output_format: OutputFormat,
+    /// Target timezone (not yet implemented - defaults to UTC)
+    pub timezone: Option<TzForm>,
+    /// Custom time format string (not yet implemented)
+    pub format: Option<String>,
+    /// Reference time for relative calculations (not yet implemented - uses current time)
+    pub now: Option<i64>,
 }
 
+/// Calculates clock hand positions for a given time.
+///
+/// Returns (hour_x, hour_y, minute_x, minute_y) coordinates for SVG rendering.
+/// Clock center is at (16, 16) with appropriate hand lengths for a 32x32 favicon.
+fn calculate_clock_hands(time: DateTime<Utc>) -> (f64, f64, f64, f64) {
+    let hour = time.hour() as f64;
+    let minute = time.minute() as f64;
+
+    // Calculate angles (12 o'clock = 0°, clockwise)
+    let hour_angle = ((hour % 12.0) + minute / 60.0) * 30.0; // 30° per hour
+    let minute_angle = minute * 6.0; // 6° per minute
+
+    // Convert to radians and adjust for SVG coordinate system (0° at top)
+    let hour_rad = (hour_angle - 90.0).to_radians();
+    let minute_rad = (minute_angle - 90.0).to_radians();
+
+    // Clock center and hand lengths
+    let center_x = 16.0;
+    let center_y = 16.0;
+    let hour_length = 7.0; // Shorter hour hand
+    let minute_length = 11.0; // Longer minute hand
+
+    // Calculate end positions
+    let hour_x = center_x + hour_length * hour_rad.cos();
+    let hour_y = center_y + hour_length * hour_rad.sin();
+    let minute_x = center_x + minute_length * minute_rad.cos();
+    let minute_y = center_y + minute_length * minute_rad.sin();
+
+    (hour_x, hour_y, minute_x, minute_y)
+}
+
+/// Renders a time value using the appropriate template.
+///
+/// Uses different templates based on output form:
+/// - Relative/Absolute: "basic.svg" with text content
+/// - Clock: "clock.svg" with calculated hand positions
 pub fn render_template(context: RenderContext) -> Result<String, tera::Error> {
     let mut template_context = Context::new();
+
+    match context.output_form {
+        OutputForm::Relative => {
             let formatter = Formatter::new();
-
-    template_context.insert("text", match context.output_form {
-        OutputForm::Relative => formatter.convert_chrono(context.value, Utc::now()),
-        OutputForm::Absolute => context.value.to_rfc3339()
-    }.as_str());
-
+            template_context.insert("text", &formatter.convert_chrono(context.value, Utc::now()));
             TEMPLATES.render("basic.svg", &template_context)
-}
+        }
+        OutputForm::Absolute => {
+            template_context.insert("text", &context.value.to_rfc3339());
+            TEMPLATES.render("basic.svg", &template_context)
+        }
+        OutputForm::Clock => {
+            let (hour_x, hour_y, minute_x, minute_y) = calculate_clock_hands(context.value);
 
+            // Format to 2 decimal places to avoid precision issues
+            let hour_x_str = format!("{:.2}", hour_x);
+            let hour_y_str = format!("{:.2}", hour_y);
+            let minute_x_str = format!("{:.2}", minute_x);
+            let minute_y_str = format!("{:.2}", minute_y);
+
+            template_context.insert("hour_x", &hour_x_str);
+            template_context.insert("hour_y", &hour_y_str);
+            template_context.insert("minute_x", &minute_x_str);
+            template_context.insert("minute_y", &minute_y_str);
+
+            TEMPLATES.render("clock.svg", &template_context)
+        }
+    }
+}

src/templates/basic.svg

@@ -1,6 +1,6 @@
-<svg width="512" height="34" xmlns="http://www.w3.org/2000/svg" font-family="Roboto Mono" font-size="27">
-    <text x="8" y="27">{{ text }}</text>
-    <style>
-        text
-    </style>
+<svg xmlns="http://www.w3.org/2000/svg" font-family="Roboto Mono"
+    font-size="27">
+    <text text-anchor="start" dy="24">
+        {{ text }}
+    </text>
 </svg>

src/templates/clock.svg

@@ -0,0 +1,37 @@
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+    <!-- Clock face -->
+    <circle cx="16" cy="16" r="15" fill="#ffffff" stroke="#000000" stroke-width="1" />
+
+    <!-- Hour markers -->
+    <g stroke="#000000" stroke-width="1">
+        <!-- 12 o'clock -->
+        <line x1="16" y1="2" x2="16" y2="5" />
+        <!-- 3 o'clock -->
+        <line x1="30" y1="16" x2="27" y2="16" />
+        <!-- 6 o'clock -->
+        <line x1="16" y1="30" x2="16" y2="27" />
+        <!-- 9 o'clock -->
+        <line x1="2" y1="16" x2="5" y2="16" />
+
+        <!-- Minor markers -->
+        <line x1="24.5" y1="4.5" x2="23.5" y2="5.5" />
+        <line x1="27.5" y1="7.5" x2="26.5" y2="8.5" />
+        <line x1="27.5" y1="24.5" x2="26.5" y2="23.5" />
+        <line x1="24.5" y1="27.5" x2="23.5" y2="26.5" />
+        <line x1="7.5" y1="27.5" x2="8.5" y2="26.5" />
+        <line x1="4.5" y1="24.5" x2="5.5" y2="23.5" />
+        <line x1="4.5" y1="7.5" x2="5.5" y2="8.5" />
+        <line x1="7.5" y1="4.5" x2="8.5" y2="5.5" />
+    </g>
+
+    <!-- Hour hand -->
+    <line x1="16" y1="16" x2="{{ hour_x }}" y2="{{ hour_y }}" stroke="#000000" stroke-width="2"
+        stroke-linecap="round" />
+
+    <!-- Minute hand -->
+    <line x1="16" y1="16" x2="{{ minute_x }}" y2="{{ minute_y }}" stroke="#000000"
+        stroke-width="1.5" stroke-linecap="round" />
+
+    <!-- Center dot -->
+    <circle cx="16" cy="16" r="1.5" fill="#000000" />
+</svg> 

src/utils.rs

@@ -0,0 +1,49 @@
+//! General utility functions used across the application.
+
+/// Splits a path on the last dot to extract filename and extension.
+/// Returns None for dotfiles (paths starting with a dot).
+pub fn split_on_extension(path: &str) -> Option<(&str, &str)> {
+    let split = path.rsplit_once('.')?;
+
+    // Check that the file is not a dotfile (.env)
+    if split.0.is_empty() {
+        return None;
+    }
+
+    Some(split)
+}
+
+/// Parses path into (filename, extension). Defaults to "svg" if no extension found.
+pub fn parse_path(path: &str) -> (&str, &str) {
+    split_on_extension(path).unwrap_or((path, "svg"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_split_on_extension() {
+        assert_eq!(split_on_extension("file.txt"), Some(("file", "txt")));
+        assert_eq!(
+            split_on_extension("path/to/file.png"),
+            Some(("path/to/file", "png"))
+        );
+        assert_eq!(split_on_extension("noextension"), None);
+        assert_eq!(split_on_extension(".dotfile"), None); // dotfiles return None
+        assert_eq!(split_on_extension("file."), Some(("file", "")));
+        assert_eq!(
+            split_on_extension("file.name.ext"),
+            Some(("file.name", "ext"))
+        );
+    }
+
+    #[test]
+    fn test_parse_path() {
+        assert_eq!(parse_path("file.txt"), ("file", "txt"));
+        assert_eq!(parse_path("path/to/file.png"), ("path/to/file", "png"));
+        assert_eq!(parse_path("noextension"), ("noextension", "svg")); // default to svg
+        assert_eq!(parse_path(".dotfile"), (".dotfile", "svg")); // dotfiles get svg default
+        assert_eq!(parse_path("file."), ("file", ""));
+    }
+}