git-hooks/pre-push-fediverse

#!/usr/bin/env bash

# Requires toot: https://github.com/ihabunek/toot
# This script posts git commit information to the Fediverse using the toot CLI
# To temperarily turn off posting, in project root:
# touch .git/ignorepost

# Check if .git/ignorepost exists - if so, exit silently
if [[ -f ".git/ignorepost" ]]; then
    exit 0
fi

# Do not allow errors
set -e

remote="$1"
url="$2"

# Clean up the repository URL to create a web-friendly link
url="${url#*@}"
url="${url%.git}"
url="${url#*://}"
shopt -s extglob # Enable extended pattern matching
url="${url/:+([0-9])/}"
url="https://${url}"

# Extract project name from repository URL
project="${url##*/}"
project="${project%.git}"

# Get pusher's name from git config more safely
pusher="$(git config user.name)"
if [[ -z "$pusher" ]]; then
    echo "Error: Could not determine user name from git config"
    exit 1
fi

# Initialize message
message=""
tags=""
branches=""

# Read push information from stdin
while read localRef localSha remoteRef remoteSha; do
    # Skip if no refs are being pushed
    [[ -z "$localRef" ]] && continue
    
    # Check if this is a tag push
    if [[ "$localRef" == refs/tags/* ]]; then
        tagName="${localRef#refs/tags/}"
        if [[ -z "$tags" ]]; then
            tags="$tagName"
        else
            tags="$tags, $tagName"
        fi
    else
        # Get current branch name from ref
        branch="${localRef#refs/heads/}"
        
        # Verify we can access the commit
        if ! git cat-file -e "$localSha"; then
            echo "Error: Cannot access commit $localSha"
            exit 1
        fi
        
        # Get latest commit message
        commit="$(git log -1 --pretty=%B $localSha)"
        
        if [[ -z "$branches" ]]; then
            branches="$branch"
        else
            branches="$branches, $branch"
        fi
    fi
done

# Construct the final message
if [[ "${branches##*,}" != "${branches}" ]]; then
    branches="${branches%, *} and ${branches##*, }"
fi
if [[ "${tags##*,}" != "${tags}" ]]; then
    tags="${tags%, *} and ${tags##*, }"
fi
if [[ -n "$tags" ]]; then
    message="$pusher tagged [$project project]($url) with: $tags"
elif [[ -n "$branches" ]]; then
    if [[ "${branches% and }" != "${branches}" ]]; then
        message="$pusher pushed changes to the $branches branches of the [$project project]($url)"
    else
        message="$pusher pushed changes to the $branches branch of the [$project project]($url)"
    fi
    if [[ "$branches" != *","* ]]; then
        # Only add commit message if pushing to a single branch
        message="$message
$commit"
    fi
fi

# Only post if we have something to say
if [[ -n "$message" ]]; then
    toot post -v public -p "$project" -t "text/markdown" "$message" &> /dev/null
fi

exit 0