watchexec

My bad. My changes related to whitespace handling completely broke several use cases, e.g.:

• watchexec -- 'echo foo; echo bar'

See discussion on #82.

This release reverts (comments out) those parts, but keeps everything else.

• #74 — Watchexec no longer panics on missing folders — patch1, 2
• #95 — Fix issues with whitespace in commands — patch2
• #96 — Add install instructions for Arch Linux — docs
• Create a Debian package on release — releng
• Add install instructions for Debian — docs

1: Other changes were added following this to convert more panics into normal errors: some glob parsing errors, and file watcher initialisation errors.

2: These changes also cause a breaking changes to the library interface, but this is not considered in the version numbers (i.e. if you use it, pin it). From cursory investigation only cargo-watch is a consumer and changes there in consequence are coordinated.

First release by @passcod! This release is merging in a variety of long-waiting improvements, but is otherwise fairly conservative.

• #77 — Better default ignore patterns for Python, Emacs, and Vim — patch
• #89 — On Linux, statically-compiled musl builds are now provided — releng
• #90 — WATCHEXEC_*_PATH environment variables are now accurately documented — docs
• #91 — On Windows, watchexec can now be installed using scoop.sh — docs
• #92 — Support OpenBSD 6.3+ — patch
• #93 — On Linux, fallback to polling if inotify limit is reached — minor

• Behavior change: removes the default ./.* ignore pattern, as it was often surprising and usually not needed with .gitignore handling.
• Add --no-default-ignore to explicitly disable all default ignores (@akerl)
• Restructured slightly to support being used as a library within other utilities (@passcod). Right now, this is mostly for cargo watch.

• POSIX: Add --signal option to specify signal to send to child process (@chr4)
• Add --no-shell option to exec() child process directly, instead of going through sh/cmd.exe (@chr4)
• Requires Rust 1.15 for building/Cargo installation

• Add -w/--watch option back to manually specify directories to watch. This is useful for cutting down on file descriptors used when watching deeply nested directory structures on Linux.
• Load .gitignore files from all watched directories, and then search upwards in the directory hierarchy for any additional ones that need to be loaded. When watching multiple directories with a common parent, .gitignore files will only be loaded once.
• Test all .gitignore files found for each notification from the outside in.

• Unix: reap children upon receipt of SIGCHLD
• Add -k option for sending SIGKILL to child processes

• Unix: Add -k option to send SIGKILL to child processes
• Unix: propagate SIGTSTP/SIGCONT signals (used when you hit control-z in your shell for job control)

• Drop --watch option, as it has confusing semantics around where to find .gitignore files. If you need it, file an issue.
• POSIX-based OSes: wait for all child processes to exit before running command
• Remove all features requiring nightly Rust builds
• Build size optimizations

• Fix infinite loop when no .gitignore file found
• Optimize filter matching
• Upgrade to notify 3

Automatically deployed release

• When waiting for all file system changes, de-dupe paths. This significantly reduces CPU for Linux users, as inotify sends a lot of notifications

• Windows: launch child processes in a new job object, letting us kill all subprocesses

• Add --run-initially flag
• Search for .gitignore files in parent dirs
• Set $WATCHEXEC_UPDATED_PATH to the first updated path
• Add --force-poll option
• macOS/Linux/BSD: launch child processes in their own process group