#!/bin/bash
#
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# The one runnable check for gitcfg. GIT_CONFIG_GLOBAL points git at a file
# in a temp directory, so the real ~/.gitconfig is never read or written.
#
# Usage: ./test-gitcfg.sh   (exit 0 = all passed)

set -u

here="$(cd "$(dirname "$0")" && pwd)"
ctl="$here/gitcfg"
tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT
export GIT_CONFIG_GLOBAL="$tmp/gitconfig"

fail=0
check() {
    if [[ "$2" == "$3" ]]; then
        echo "ok   $1"
    else
        echo "FAIL $1"
        printf '  want: %q\n  got:  %q\n' "$2" "$3"
        fail=1
    fi
}
vals() { git config --global --get-all "$1" | paste -sd,; }

# Values starting with a dash, as versionsort.prereleasesuffix holds, and a
# comment that every write must leave alone.
printf '# keep me\n[v]\n\ts = -rc\n\ts = -beta\n\ts = -alpha\n' > "$GIT_CONFIG_GLOBAL"

check "list" $'v.s\n-rc|v.s\n-beta|v.s\n-alpha|' "$("$ctl" list | tr '\0' '|')"

out="$("$ctl" set v.s -beta -BETA)"; rc=$?
check "set one of three: rc" 0 "$rc"
check "set one of three: silent" "" "$out"
check "set one of three: values" "-rc,-BETA,-alpha" "$(vals v.s)"

# git would append here and exit 0; gitcfg must refuse instead.
out="$("$ctl" set v.s -gone x)"; rc=$?
check "set missing old: rc" 1 "$rc"
check "set missing old: says so" 1 "$([[ -n "$out" ]] && echo 1)"
check "set missing old: nothing appended" "-rc,-BETA,-alpha" "$(vals v.s)"

out="$("$ctl" unset v.s -rc)"; rc=$?
check "unset one of three: rc" 0 "$rc"
check "unset one of three: values" "-BETA,-alpha" "$(vals v.s)"

out="$("$ctl" unset v.s -gone)"; rc=$?
check "unset missing: rc" 1 "$rc"
check "unset missing: says so" 1 "$([[ -n "$out" ]] && echo 1)"

out="$("$ctl" add a.b "x=y")"; rc=$?
check "add with =: rc" 0 "$rc"
check "add with =: value" "x=y" "$(vals a.b)"

out="$("$ctl" add "bad key" v)"; rc=$?
check "add bad key: rc" 1 "$rc"
check "add bad key: git's error" 1 "$([[ "$out" == *section* ]] && echo 1)"

check "comment kept" 1 "$(grep -c '^# keep me$' "$GIT_CONFIG_GLOBAL")"

# A value held twice: --fixed-value would replace or trip on both, so gitcfg
# refuses rather than silently merging two rows into one.
printf '[d]\n\tv = a\n\tv = a\n\tv = b\n' >> "$GIT_CONFIG_GLOBAL"
out="$("$ctl" set d.v a c)"; rc=$?
check "set duplicate: rc" 1 "$rc"
check "set duplicate: untouched" "a,a,b" "$(vals d.v)"
out="$("$ctl" unset d.v a)"; rc=$?
check "unset duplicate: rc" 1 "$rc"
check "unset duplicate: says why" 1 "$([[ "$out" == *twice* ]] && echo 1)"

# A file git cannot parse lists nothing on stdout without this, which the
# page would draw as an empty config.
cp "$GIT_CONFIG_GLOBAL" "$tmp/good"
printf '[x\n' >> "$GIT_CONFIG_GLOBAL"
out="$("$ctl" list)"; rc=$?
check "list broken file: rc" 1 "$rc"
check "list broken file: error= line" 1 "$([[ "$out" == error=* ]] && echo 1)"
cp "$tmp/good" "$GIT_CONFIG_GLOBAL"

"$ctl" bogus >/dev/null 2>&1; rc=$?
check "usage: rc" 2 "$rc"

exit "$fail"