Bash > List all PRs merged since a given commit was tagged (since a given version)

prs-merged-since

#!/bin/bash

# Attempts to list PRs merged since a given tag was created.
#
# Run from within the repo you are interested in (of course fetch/pull
# down all the latest changes from remote).
#
# Usage:   prs-merged-since <tag_name>
# Example: prs-merged-since v1.0.0

if [ $# -eq 0 ]; then
    echo "Usage: $0 <tag_name>"
    exit 1
fi

TAG_NAME=$1

# Get the date of the tag
TAG_DATE=$(git log -1 --format=%ai "$TAG_NAME" 2>/dev/null)

if [ $? -ne 0 ]; then
    echo "Error: Tag '$TAG_NAME' not found"
    exit 1
fi

# Convert tag date to timestamp for comparison
TAG_TIMESTAMP=$(date -d "$TAG_DATE" +%s)

# Get all merged pull requests with their merge dates
git log --merges --format="%ai | %s" | while read line; do
    MERGE_DATE=$(echo "$line" | cut -d'|' -f1)
    MERGE_TIMESTAMP=$(date -d "$MERGE_DATE" +%s)
    
    # Only show PRs merged after the tag date
    if [ $MERGE_TIMESTAMP -gt $TAG_TIMESTAMP ]; then
        # Extract PR number and title
        PR_INFO=$(echo "$line" | cut -d'|' -f2)
        if [[ $PR_INFO =~ "Merge pull request #"([0-9]+)" from" ]]; then
            PR_NUMBER="${BASH_REMATCH[1]}"
            echo "PR #$PR_NUMBER | $MERGE_DATE | $PR_INFO"
        fi
    fi
done