run-if-changed 0.1.0

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run-if conditionally run command if targets don't exist or dependencies have changed.

This is a simple python script that bascially does what checkexec (https://github.com/kurtbuilds/checkexec), but it uses a hash of the contents of the dependencies to decide if the command should be ran and supports multiple targets.

$ run-if main.cpp == g++ main.pp -o main == main

If main does not exist, or if the contents of main.cpp have changed since the last time it run-if was called, the command will be run.

The syntax is different than checkexec

$ run-if [DEPENDENCY...] == <COMMAND> == [TARGET...]

Multiple targets can be listed and both targets and dependencies can be files or directories.

$ run-if -- src/ == cmake --build build == build/test1 build/test2 build/data/

Currently the hash of dependencies are being computed with shell commands using the subprocess module, so it will fail to run if md5sum or gawk are missing, or if the default shell does not support pipes.

Install

$ pip install run-if