mapsize/DEVELOPMENT.md

Development

Requires a stable Rust toolchain (rustup); the dependencies are pinned in Cargo.lock. No C toolchain beyond what Rust itself needs.

make build       # target/release/mapsize
make test        # cargo test --release
make lint        # clippy, warnings are errors
make fmt-check   # rustfmt
make benchmark   # in-process benchmarks (layout, render, filter): examples/bench.rs
make treegen     # synthetic test-tree generator: examples/treegen.rs
make release     # local release assets in dist/release (see below)

CI (.github/workflows/ci.yml) runs rustfmt and clippy, the tests on Linux (x86-64 and ARM64), macOS (Intel and Apple silicon) and Windows, and cross-builds every release target, running the ARM and RISC-V Linux binaries under qemu.

Platforms

scripts/build.sh builds dist/mapsize-OS-ARCH:

OS	Architectures	Rust target	Built with
Linux	amd64, arm64, 386, arm (v7), riscv64	*-unknown-linux-musl (static)	cargo-zigbuild + zig
Windows	amd64, arm64	x86_64-pc-windows-gnu, aarch64-pc-windows-gnullvm	cargo-zigbuild + zig
macOS	amd64, arm64	*-apple-darwin	cargo on a Mac (or zigbuild)
FreeBSD, NetBSD	amd64	x86_64-unknown-{freebsd,netbsd}	cross + Docker

Platform differences live in src/platform.rs (and cfg blocks where the terminal code needs them); nothing else switches on the OS.

Releasing

Example for 1.2.0; substitute the real version throughout.

1. Update the version in Cargo.toml (then cargo check to refresh Cargo.lock) and docs/mapsize.1, and turn ## Unreleased in CHANGELOG.md into ## 1.2.0 — DATE. Commit.
2. Tag and push:

   git tag -a v1.2.0 -m "mapsize 1.2.0"
   git push origin master v1.2.0
   

3. The tag starts .github/workflows/release.yml, which builds every target, packages them (archives, .deb/.rpm/.apk/Arch packages, SHA256SUMS) and publishes the GitHub release with the changelog section as its notes. Watch it with gh run watch. make release builds the same assets locally into dist/release, for whichever targets the host can build (scripts/build.sh, then scripts/release.sh).
4. Check the release page once the workflow has finished.
5. Update Homebrew. This needs the tag pushed (step 2), because it checksums GitHub's source tarball for that tag:

   make brew-formula VERSION=v1.2.0      # writes dist/homebrew/mapsize.rb
   git clone https://github.com/andydixon/homebrew-tap /tmp/tap
   cp dist/homebrew/mapsize.rb /tmp/tap/Formula/mapsize.rb
   git -C /tmp/tap commit -am "mapsize 1.2.0" && git -C /tmp/tap push
   

   Users get it with brew upgrade mapsize. Template: packaging/homebrew/mapsize.rb.in.
6. Publish to the apt, dnf and pacman repository at repo.dixon.cx. This builds signed .deb, .rpm and Arch packages from the tag and rebuilds the repository indexes (needs cargo-zigbuild and zig, docker, gpg, apt-ftparchive and the signing key in ~/.config/repo.dixon.cx/gnupg):

   packaging/repo.sh v1.2.0
   

   The same script, with its own project block, publishes vault.

The binary reports the version in Cargo.toml; scripts/release.sh refuses to package a tag that does not match it.

The snapshot format is stable at version 1: a format change must bump snapshot.Version and keep the reader for version 1.

Test data

treegen creates synthetic trees:

cargo run --release --example treegen -- --out /tmp/t --directories 50000 --files 1000000 --max-depth 20 --sparse --unicode
target/release/mapsize /tmp/t

Benchmarks

make benchmark                          # in-process: layout, render, navigation, filters
scripts/bench-scan.sh /path 1 2 4 8     # wall time and peak RSS per worker count
sudo DROP_CACHES=1 scripts/bench-scan.sh /path   # cold-cache runs

Paste results into PERFORMANCE.md with the machine description. Never edit numbers by hand.

Terminal restoration checks

MAPSIZE_DEBUG_PANIC=ui target/release/mapsize .        # panics on the first key press
MAPSIZE_DEBUG_PANIC=scanner target/release/mapsize /   # panics in a scanner thread (aborts)
stty -a                                     # echo/icanon must be back on

Profiling

Build with symbols (CARGO_PROFILE_RELEASE_STRIP=false CARGO_PROFILE_RELEASE_DEBUG=1 cargo build --release) and use the platform profiler, for example perf record -g target/release/mapsize --no-ui /path on Linux or Instruments on macOS. examples/bench.rs times the hot UI paths in-process.

Layout

See ARCHITECTURE.md. Rules of thumb:

• treemap and filter must not depend on tui.
• OS-specific code lives in platform (cfg attributes); the terminal code has the only other cfg blocks.
• All strings derived from filenames go through textutil::sanitize before reaching a terminal.