feat: add AI message generation via spice.messageGenerator#1160
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Add `spice.messageGenerator` config option and `--fill`/`-c` flag to `commit create`, `commit amend`, `branch create`, `branch submit`, and `branch squash`. The configured script runs in the repository root with `GS_MESSAGE_KIND`, `GS_MESSAGE_UPDATE`, and context-specific environment variables (`GS_BRANCH`, `GS_BASE`, `GS_MESSAGE`, `GS_TITLE`, `GS_BODY`). The invoking process's argv is forwarded as positional parameters. The new `msggen` package executes scripts in either shebang or `sh -c` mode. Forges (GitHub, GitLab, Bitbucket, ShamHub) gain support for editing CR subject/body so generated messages can update existing changes. `--fill` coexists with `-m`/`-F` so a generator failure can fall back to a user-supplied message. Includes documentation, an example generator script, and end-to-end test scripts covering generation, updating, fallback on generator failure, and missing-generator errors.
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This change is part of the following stack: Change managed by git-spice. |
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assuming #1170 is authoritative. closing in favor of that. |
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Summary
Adds a
--fillflag togs commit create,gs commit amend,gs branch create,gs branch submit, andgs branch squashthatinvokes an external script to generate or update commit messages and
PR titles/bodies. The script is configured via the
spice.messageGeneratorgit config key and runs in the repositoryroot.
Scripts receive context through environment variables
(
GS_MESSAGE_KIND,GS_MESSAGE_UPDATE,GS_BRANCH,GS_BASE,GS_MESSAGE,GS_TITLE,GS_BODY) and the invokinggsargumentvector as positional parameters. Output is parsed as either a full
commit message or as
title\n\nbodyfor branch messages. If thescript starts with
#!, it is written to a temp file and executeddirectly; otherwise it is run via
sh -c. Script failures fall backto the default editor flow; when
--fillis set with no generatorconfigured, the command errors with guidance to configure one.
The forge layer gains
Subject/Bodyfields onEditChangeOptionsand
FindChangeItemso that branch updates can push generatedtitles/bodies to GitHub, GitLab, Bitbucket, and ShamHub. A new
guide/ai-messages.mddocuments the feature, including a ClaudeCode example.
Test plan
mise run test(unit tests formsggenandspice.Config)mise run test:scriptcovering the new scripts:commit_create_fill_generator,commit_create_fill_env,commit_create_fill_generator_fallback,commit_amend_fill_updater,commit_amend_fill_no_generator,branch_squash_fill,branch_squash_fill_no_generator,branch_submit_fill_generator,branch_submit_fill_updater,stack_submit_fill_generator,stack_submit_fill_updaterspice.messageGenerator(shell one-linerand shebang script) and verify
--fillpopulates commit andPR messages on a real GitHub repo
the explicit error when
--fillis used without a configuredgenerator