Initial stub with license, CI, README

.github/copyright.sh

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+#!/bin/bash
+
+# If there are new files with headers that can't match the conditions here,
+# then the files can be ignored by an additional glob argument via the -g flag.
+# For example:
+#   -g "!src/special_file.rs"
+#   -g "!src/special_directory"
+
+# Check all the standard Rust source files
+output=$(rg "^// Copyright (19|20)[\d]{2} (.+ and )?the Color Authors( and .+)?$\n^// SPDX-License-Identifier: Apache-2\.0 OR MIT$\n\n" --files-without-match --multiline -g "*.rs" .)
+
+if [ -n "$output" ]; then
+	echo -e "The following files lack the correct copyright header:\n"
+	echo $output
+	echo -e "\n\nPlease add the following header:\n"
+	echo "// Copyright $(date +%Y) the Color Authors"
+	echo "// SPDX-License-Identifier: Apache-2.0 OR MIT"
+	echo -e "\n... rest of the file ...\n"
+	exit 1
+fi
+
+echo "All files have correct copyright headers."
+exit 0
+

.github/workflows/ci.yml

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+env:
+  # We aim to always test with the latest stable Rust toolchain, however we pin to a specific
+  # version like 1.70. Note that we only specify MAJOR.MINOR and not PATCH so that bugfixes still
+  # come automatically. If the version specified here is no longer the latest stable version,
+  # then please feel free to submit a PR that adjusts it along with the potential clippy fixes.
+  RUST_STABLE_VER: "1.82" # In quotes because otherwise (e.g.) 1.70 would be interpreted as 1.7
+  # The purpose of checking with the minimum supported Rust toolchain is to detect its staleness.
+  # If the compilation fails, then the version specified here needs to be bumped up to reality.
+  # Be sure to also update the rust-version property in the workspace Cargo.toml file,
+  # plus all the README.md files of the affected packages.
+  RUST_MIN_VER: "1.82"
+  # List of packages that will be checked with the minimum supported Rust version.
+  # This should be limited to packages that are intended for publishing.
+  RUST_MIN_VER_PKGS: "-p color -p color_operations"
+  # List of features that depend on the standard library and will be excluded from no_std checks.
+  FEATURES_DEPENDING_ON_STD: "std,default"
+
+
+# Rationale
+#
+# We don't run clippy with --all-targets because then even --lib and --bins are compiled with
+# dev dependencies enabled, which does not match how they would be compiled by users.
+# A dev dependency might enable a feature that we need for a regular dependency,
+# and checking with --all-targets would not find our feature requirements lacking.
+# This problem still applies to cargo resolver version 2.
+# Thus we split all the targets into two steps, one with --lib --bins
+# and another with --tests --benches --examples.
+# Also, we can't give --lib --bins explicitly because then cargo will error on binary-only packages.
+# Luckily the default behavior of cargo with no explicit targets is the same but without the error.
+#
+# We use cargo-hack for a similar reason. Cargo's --workspace will do feature unification across
+# the whole workspace. While cargo-hack will instead check each workspace package separately.
+#
+# Using cargo-hack also allows us to more easily test the feature matrix of our packages.
+# We use --each-feature & --optional-deps which will run a separate check for every feature.
+#
+# The MSRV jobs run only cargo check because different clippy versions can disagree on goals and
+# running tests introduces dev dependencies which may require a higher MSRV than the bare package.
+#
+# For no_std checks we target x86_64-unknown-none, because this target doesn't support std
+# and as such will error out if our dependency tree accidentally tries to use std.
+# https://doc.rust-lang.org/stable/rustc/platform-support/x86_64-unknown-none.html
+#
+# We don't save caches in the merge-group cases, because those caches will never be re-used (apart
+# from the very rare cases where there are multiple PRs in the merge queue).
+# This is because GitHub doesn't share caches between merge queues and the main branch.
+
+name: CI
+
+on:
+  pull_request:
+  merge_group:
+  # We run on push, even though the commit is the same as when we ran in merge_group.
+  # This allows the cache to be primed.
+  # See https://github.com/orgs/community/discussions/66430
+  push:
+    branches:
+      - main
+
+jobs:
+  fmt:
+    name: formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          components: rustfmt
+
+      - name: cargo fmt
+        run: cargo fmt --all --check
+
+      - name: install ripgrep
+        run: |
+          sudo apt update
+          sudo apt install ripgrep
+
+      - name: check copyright headers
+        run: bash .github/copyright.sh
+
+  clippy-stable:
+    name: cargo clippy
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, macos-latest, ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          targets: x86_64-unknown-none
+          components: clippy
+
+      - name: install cargo-hack
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack
+
+      - name: cargo clippy (no_std)
+        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --ignore-unknown-features --features libm --exclude-features ${{ env.FEATURES_DEPENDING_ON_STD }} --target x86_64-unknown-none -- -D warnings
+
+      - name: cargo clippy
+        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --ignore-unknown-features --features std -- -D warnings
+
+      - name: cargo clippy (auxiliary)
+        run: cargo hack clippy --workspace --locked --optional-deps --each-feature --ignore-unknown-features --features std --tests --benches --examples -- -D warnings
+
+  clippy-stable-wasm:
+    name: cargo clippy (wasm32)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          targets: wasm32-unknown-unknown
+          components: clippy
+
+      - name: install cargo-hack
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack
+
+      - name: cargo clippy
+        run: cargo hack clippy --workspace --locked --target wasm32-unknown-unknown --optional-deps --each-feature --ignore-unknown-features --features std -- -D warnings
+
+      - name: cargo clippy (auxiliary)
+        run: cargo hack clippy --workspace --locked --target wasm32-unknown-unknown --optional-deps --each-feature --ignore-unknown-features --features std --tests --benches --examples -- -D warnings
+
+  test-stable:
+    name: cargo test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, macos-latest, ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+
+      - name: cargo test
+        run: cargo test --workspace --locked --all-features
+
+  test-stable-wasm:
+    name: cargo test (wasm32)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          targets: wasm32-unknown-unknown
+
+      # TODO: Find a way to make tests work. Until then the tests are merely compiled.
+      - name: cargo test compile
+        run: cargo test --workspace --locked --target wasm32-unknown-unknown --all-features --no-run
+
+  check-msrv:
+    name: cargo check (msrv)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, macos-latest, ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install msrv toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_MIN_VER }}
+          targets: x86_64-unknown-none
+
+      - name: install cargo-hack
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack
+
+      - name: cargo check (no_std)
+        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --optional-deps --each-feature --ignore-unknown-features --features libm --exclude-features ${{ env.FEATURES_DEPENDING_ON_STD }} --target x86_64-unknown-none
+
+      - name: cargo check
+        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --optional-deps --each-feature --ignore-unknown-features --features std
+
+  check-msrv-wasm:
+    name: cargo check (msrv) (wasm32)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install msrv toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_MIN_VER }}
+          targets: wasm32-unknown-unknown
+
+      - name: install cargo-hack
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack
+
+      - name: cargo check
+        run: cargo hack check ${{ env.RUST_MIN_VER_PKGS }} --locked --target wasm32-unknown-unknown --optional-deps --each-feature --ignore-unknown-features --features std
+
+  doc:
+    name: cargo doc
+    # NOTE: We don't have any platform specific docs in this workspace, so we only run on Ubuntu.
+    #       If we get per-platform docs (win/macos/linux/wasm32/..) then doc jobs should match that.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: install nightly toolchain
+        uses: dtolnay/rust-toolchain@nightly
+
+      # We test documentation using nightly to match docs.rs. This prevents potential breakages
+      - name: cargo doc
+        run: cargo doc --workspace --locked --all-features --no-deps --document-private-items -Zunstable-options -Zrustdoc-scrape-examples
+
+  # If this fails, consider changing your text or adding something to .typos.toml
+  typos:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: check typos
+        uses: crate-ci/[email protected]

.gitignore

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+/target

.typos.toml

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+# See the configuration reference at
+# https://github.com/crate-ci/typos/blob/master/docs/reference.md
+
+# Corrections take the form of a key/value pair. The key is the incorrect word
+# and the value is the correct word. If the key and value are the same, the
+# word is treated as always correct. If the value is an empty string, the word
+# is treated as always incorrect.
+
+# Match Identifier - Case Sensitive
+[default.extend-identifiers]
+
+# Match Inside a Word - Case Insensitive
+[default.extend-words]
+
+[files]
+# Include .github, .cargo, etc.
+ignore-hidden = false
+extend-exclude = [
+    # /.git isn't in .gitignore, because git never tracks it.
+    # Typos doesn't know that, though.
+    "/.git",
+]

AUTHORS

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+# This is the list of Color's significant contributors.
+#
+# This does not necessarily list everyone who has contributed code,
+# especially since many employees of one corporation may be contributing.
+# To see the full list of contributors, see the revision history in
+# source control.
+Raph Levien