git.subr

# Copyright 2025 Julio Merino
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

shtk_import bool
shtk_import cli
shtk_import process


shtk_git_fetch() {
    local repo="${1}"; shift
    local branch="${1}"; shift
    local directory="${1}"; shift

    if [ -d "${directory}" ]; then
        shtk_git_update "${branch}" "${directory}"
    else
        shtk_git_clone "${repo}" "${branch}" "${directory}"
    fi
}


shtk_git_clone() {
    local repo="${1}"; shift
    local branch="${1}"; shift
    local directory="${1}"; shift

    [ ! -d "${directory}" ] || shtk_cli_error "Cannot clone into" \
        "${directory}; directory already exists"
    shtk_process_run git clone -b "${branch}" "${repo}" \
        "${directory}" || shtk_cli_error "git clone failed"
}


shtk_git_update() {
    local branch="${1}"; shift
    local directory="${1}"; shift

    [ -d "${directory}" ] || shtk_cli_error "Cannot update ${directory};" \
        "directory does not exist"

    shtk_process_run -w "${directory}" git fetch origin "${branch}" \
        || shtk_cli_error "git update failed"
    shtk_process_run -w "${directory}" git checkout "${branch}" \
        || shtk_cli_error "git update failed"
    shtk_process_run -w "${directory}" git merge --ff-only "origin/${branch}" \
        || shtk_cli_error "git update failed"
}