feat: improve behavior when config file is missing

[calebcartwright]

Changes

• Externalizes the hook script contents into a script file
• Enhances the rusty-hook cli to respond with a specific exit code (currently 3) when the internal error was a missing config file
• Enhances the git hook scripts to look at the exit code from rusty-hook.
  • Obviously on a zero exit code, everything will pass/proceed as normal
  • On a non-zero exit code, the script will print a message stating which git hook was rejected
  • On a missing config file exit code, the hook will instead exit with 0, allowing the git hook workflow to continue. The pre-commit hook will also display a warning message to the user:

rusty-hook git hooks are configured, but no config file was found
In order to use rusty-hook, your project must have a config file
See https://github.com/swellaby/rusty-hook#configure for more information

If you were trying to remove rusty-hook, then you should also delete the git hook files to remove this warning

Related Issues

• Closes Different behavior on missing config file #52
• Closes Externalize hook script(s) in source with include_str! macro #49

[codecov]

Codecov Report

Merging #53 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #53   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines         134    141    +7     
=====================================
+ Hits          134    141    +7

Impacted Files	Coverage Δ
src/config.rs	100% <100%> (ø)	⬆️
src/git.rs	100% <100%> (ø)	⬆️
src/rusty_hook.rs	100% <100%> (ø)	⬆️

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[calebcartwright]

We can update this message later on after #51 is completed to include a link to those docs on how to remove rusty-hook. I think it's more important to get this new behavior out though, so plan on tackling #51 (and probably #48) in a follow up PR.

[calebcartwright]

{{NO_CONFIG_FILE_EXIT_CODE}} is tokenized here so that rusty-hook can inject the correct value as part of writing all the git hook script files. Unsurprisingly, shellcheck doesn't like that, hence the above inline disables.

[beverts312]

lgtm

[traviskosarek]

I agree, looks like a good addition