#!/bin/bash -e
#
# './g log [-p] file.cxx' to see the entire 'git log [-p] --follow file.cxx'
# across the engine subtree merge (normal 'git log [-p] --follow' just stops
# at the 'merge-engine' commit and does not show anything further).
#
# './g pull -r' just forwards to 'git pull -r'.
#
# './g review [branch]' to submit changes for review on Collabora's Gerrit,
# assuming:
# 1) You have a remote pointing at ssh://<user>@gerrit.collaboraoffice.com:29418/online
#    (typically named 'origin' or 'cogerrit').
# 2) All commits but the topmost are pushed as WIP; the topmost commit is the
#    actual review.
# If [branch] is given (e.g. 'main' or 'distro/collabora/co-26-04'), the
# current branch's upstream is set to <gerrit-remote>/<branch> first.
#

# e.g. co-4-2
BRANCH=$(git symbolic-ref HEAD|sed 's|refs/heads/||')

if [ "$1" == "review" ]; then
    # Find the remote that points at Collabora's Gerrit.  This is
    # usually 'origin' or 'cogerrit' depending on user's setup.
    GERRIT_REMOTE=
    for r in $(git remote); do
        if git remote get-url "$r" | grep -q gerrit.collaboraoffice.com; then
            GERRIT_REMOTE=$r
            break
        fi
    done
    if [ -z "$GERRIT_REMOTE" ]; then
        echo "Error: no remote pointing at gerrit.collaboraoffice.com found."
        echo "Add one with e.g.:"
        echo "  git remote add cogerrit ssh://\$USER@gerrit.collaboraoffice.com:29418/online"
        exit 1
    fi

    # If a target branch was passed, set the upstream so the rest of the
    # script can derive REMOTE/TRACKED_BRANCH from it normally.
    if [ -n "$2" ]; then
        git branch --set-upstream-to=$GERRIT_REMOTE/$2 $BRANCH
    fi

    # e.g. origin
    REMOTE=$(git config branch.$BRANCH.remote || true)
    if [ -z "$REMOTE" ]; then
        echo "Error: no upstream configured for branch '$BRANCH'."
        echo "Pass a target branch: ./g review <branch>"
        exit 1
    fi

    # The branch we're pushing changes for, derived from the upstream
    # branch (e.g. main, distro/collabora/co-26-04).
    TRACKED_BRANCH=$(git rev-parse --abbrev-ref --symbolic-full-name HEAD@{upstream}|sed "s|${REMOTE}/||")

    # Push everything except the topmost commit as WIP, and the
    # topmost commit as the actual review.
    NUM_COMMITS=$(git rev-list --count $REMOTE/$TRACKED_BRANCH..HEAD)
    if [ "$NUM_COMMITS" -lt 1 ]; then
        echo "Error: no commits to push for review."
        exit 1
    fi
    if [ "$NUM_COMMITS" -gt 1 ]; then
        # Push WIP commits.  If Gerrit rejects with "no new changes" it
        # just means the WIP patches are already up-to-date; continue
        # to push the topmost commit as the actual review.
        set +e
        wip_output=$(git push $GERRIT_REMOTE HEAD~1:refs/for/$TRACKED_BRANCH%wip 2>&1)
        wip_status=$?
        set -e
        if [ $wip_status -eq 0 ]; then
            echo "$wip_output"
        elif echo "$wip_output" | grep -q "no new changes"; then
            echo "Note: old (WIP) commits unchanged on the server - error message suppressed."
        else
            echo "$wip_output"
            exit $wip_status
        fi
    fi
    git push $GERRIT_REMOTE HEAD:refs/for/$TRACKED_BRANCH

    exit 0
fi

if [ "$1" == "pull" ]; then
    shift
    git pull "$@"
    exit 0
fi

if [ "$1" == "log" ]; then
    shift
    "$(dirname -- "${BASH_SOURCE[0]}")"/engine/bin/engine-git-log.sh "$@"
    exit 0
fi

git "$@"

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