git hook to update manifests in for Julia packages

pre-commit

#!/bin/bash
# A script that updates main, docs, and test manifests in a Julia
# package, provided they exist. For use as a git hook, eg pre-commit.
# 
# Copyright (c) 2025 Tamás K. Papp
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# customize here
OLD_DAYS=10            # days after which a manifest is considered old
# runtime
if [[ -n "$CI" ]]; then
   echo "In CI, skipping updates."
   exit 0
fi
if [ `git rev-parse --is-bare-repository` == "true" ]; then
   echo "In bare repository, skipping updates."
   exit 0
fi
JULIA=`which julia`
if [ -z "$JULIA" ]; then
   echo "Julia executable not found, skipping updates."
   exit 1
fi
function is_manifest_old() {
    if [[ -f $1 ]]; then
        local mtime=$(stat -c %Y "$1")
        local ctime=$(date +%s)
        local agedays=$(( (ctime - mtime) / 86400))
        if [[ agedays -ge 10 ]]; then
            echo "old"
        else
            echo "recent"
        fi
    else
        echo "doesnotexist"
    fi   
}
MAIN="$(is_manifest_old "Manifest.toml")"
TEST="$(is_manifest_old "test/Manifest.toml")"
DOCS="$(is_manifest_old "docs/Manifest.toml")"
if [[ !($MAIN == "old") || ($DOCS == "old") || ($TEST == "old") ]]; then
    exit 0
fi
printf "\033[0;31mUpdating manifests, this may take a few seconds\n"
cat <<"EOF" | $JULIA --startup-file=no -q -
import Pkg
function maybe_update_project(dir)
    isfile(joinpath(dir, "Project.toml")) || return
    Pkg.activate(dir)
    Pkg.update()
end
maybe_update_project(".")
maybe_update_project("test/")
maybe_update_project("docs/")
EOF