gitcloc.sh

#!/usr/bin/env bash
usage() {
    echo "
usage: gitcloc branch [--help]

Clear/delete local branches that have been merged into the branch provided as first argument.
The branch must be provided as the first argument even when calling with optional arguments.
optional arguments:
    --help                   Shows this help message.
"
}

set -e
if [ -z "$1" ] || [ "$#" -gt 1 ] || [[ "$@" == *"--help"* ]]; then
    usage
else
    # Create a file to contain list of all merged branches.
    TMP_BRANCHES_FILE=$(mktemp)
    trap '{ rm -f $TMP_BRANCHES_FILE; }' EXIT

    # Store current branch and switch to target branch.
    CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
    if [ "$CURRENT_BRANCH" != "$1" ]; then
        git checkout "$1"
    fi

    # Redirect merged branches to tmp file for interactive editing.
    git branch --merged | sed 's/^ *//; s/ *$//; /^$/d; /^[*]/d' > "$TMP_BRANCHES_FILE"

    # Check that there are merged branches to be delete before continuing.
    LINE_COUNT=$(wc -l "$TMP_BRANCHES_FILE" | awk '{print $1}')
    if [[ $LINE_COUNT -gt 0 ]]; then
        $(git var GIT_EDITOR) "$TMP_BRANCHES_FILE"
        # Trim trailing/leading space, and empty lines after edit.
        TEMP=$(sed 's/^ *//; s/ *$//; /^$/d' "$TMP_BRANCHES_FILE")
        echo "$TEMP" > "$TMP_BRANCHES_FILE"
        # Soft delete all branches left in the file.
        set +e
        xargs git branch -d < "$TMP_BRANCHES_FILE"
    else
        echo "No branches found for clearing."
    fi

    # Switch back to original branch if it still exists.
    set -e
    if [ "$CURRENT_BRANCH" != "$1" ]; then
        git checkout "$CURRENT_BRANCH" 2> /dev/null
    fi
fi