[cmake] Update CPMUtil (#4123)

Notable changes

- Single cpmfile
- version/min_version/git_version have been fixed and replaced with
  version and min_version
- Docs rewrite
- Legacy options are gone
- Fixed update/version commands
- Added patch creation functionality

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4123
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

tools/cpm/package/patch.sh

@@ -0,0 +1,173 @@
+#!/bin/sh -e
+
+# SPDX-FileCopyrightText: Copyright 2026 crueter
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+# shellcheck disable=SC1091
+. "$SCRIPTS"/../common.sh
+
+RETURN=0
+
+usage() {
+	cat <<EOF
+Usage: cpmutil.sh package patch [PACKAGE]
+
+Create an in-tree patch for the specified package.
+
+EOF
+
+	exit "$RETURN"
+}
+
+die() {
+	echo "-- $*" >&2
+	RETURN=1 usage
+}
+
+while :; do
+	case "$1" in
+	-h | --help) usage ;;
+	"$0") break ;;
+	"") break ;;
+	*)
+		if [ -n "$PACKAGE" ]; then
+			die "You may only specify one package."
+		else
+			PACKAGE="$1"
+		fi
+		;;
+	esac
+
+	shift
+done
+
+[ -n "$PACKAGE" ] || usage
+
+unset JSON
+export PACKAGE
+
+# shellcheck disable=SC1091
+. "$SCRIPTS"/vars.sh
+
+if [ "$CI" = true ]; then
+	die "CI packages do not support in-tree patching"
+fi
+
+patch_dir="$PWD/.patch/$PACKAGE"
+TMP=$(make_temp_dir)
+
+tmp_package="${TMP}/${LOWER_PACKAGE}/${KEY}"
+
+# First fetch the package...
+
+# shellcheck disable=SC1091
+. "$SCRIPTS"/util/fetch.sh
+
+local_dir="$CPM_SOURCE_CACHE/$LOWER_PACKAGE/$KEY"
+
+if [ ! -d "$local_dir" ]; then
+	echo "-- $PACKAGE_NAME is not fetched locally" >&2
+	exit 1
+fi
+
+src_dir="$tmp_package/$LOWER_PACKAGE/$KEY"
+
+CPM_SOURCE_CACHE="$tmp_package" fetch_package
+
+mkdir -p "$patch_dir"
+
+existing=$(find "$patch_dir" -maxdepth 1 -type f -name '[0-9][0-9][0-9][0-9]-*.patch' 2>/dev/null | sort | tail -1)
+if [ -n "$existing" ]; then
+	last_num=$(basename "$existing" | cut -c1-4)
+	last_num=$(echo "$last_num" | sed 's/^0*//')
+	last_num="${last_num:-0}"
+	next_num=$(printf "%04d" $((last_num + 1)))
+else
+	next_num="0001"
+fi
+
+echo "-- Creating patch for $PACKAGE..."
+
+orig_dir="$PWD"
+if cmd_exists git; then
+	cd "$src_dir"
+
+	git init >/dev/null 2>&1
+	git add -A >/dev/null 2>&1
+	git commit -m "base" >/dev/null 2>&1
+
+	git --work-tree="$local_dir" add -A #>/dev/null 2>&1
+
+	if git diff --cached --quiet; then
+		echo "-- No differences found between local and source"
+		cd "$orig_dir"
+		rm -rf "$TMP"
+		exit 0
+	fi
+
+	if ! git commit -v; then
+		echo "-- Patch cancelled" >&2
+		cd "$orig_dir"
+		rm -rf "$TMP"
+		exit 1
+	fi
+
+	description=$(git log -1 --format="%s")
+
+	git format-patch -1 HEAD --stdout >"$patch_dir/tmp.patch"
+	rm -rf .git
+
+	cd "$orig_dir"
+	unset orig_dir
+else
+	if diff -ruN "$src_dir" "$local_dir" >/dev/null 2>&1; then
+		echo "-- No differences found between local and source"
+		rm -rf "$TMP"
+		exit 0
+	fi
+
+	printf -- "-- Enter a patch description: "
+	if ! read -r description; then
+		echo "" >&2
+		echo "-- Patch cancelled" >&2
+		rm -rf "$TMP"
+		exit 1
+	fi
+
+	mkdir -p "$TMP/patchdir/a" "$TMP/patchdir/b"
+	cp -r "$src_dir/." "$TMP/patchdir/a/"
+	cp -r "$local_dir/." "$TMP/patchdir/b/"
+	cd "$TMP/patchdir"
+	{
+		echo "Subject: [PATCH] $description" | fold -s -w 80
+		echo "---"
+		diff -ruN a b || true
+	} >"$patch_dir/tmp.patch"
+
+	cd "$orig_dir"
+	unset orig_dir
+fi
+
+rm -rf "$TMP"
+
+if [ ! -s "$patch_dir/tmp.patch" ]; then
+	rm -f "$patch_dir/tmp.patch"
+	echo "-- No differences found between local and source for $PACKAGE"
+	exit 0
+fi
+
+name_part=$(printf "%s" "$description" | sed 's/^[0-9]\{4\}-//' | sed 's/ /-/g; s/[^a-zA-Z0-9-]//g; s/--*/-/g; s/^-//; s/-$//')
+[ -n "$name_part" ] || name_part="patch"
+
+# max is 60 chars, minus 5 for number, minus 6 for patch suffix
+max_name_len=49
+name_part=$(printf "%s" "$name_part" | cut -c1-"$max_name_len" | sed 's/-$//')
+
+patch_name="${next_num}-${name_part}.patch"
+
+mv "$patch_dir/tmp.patch" "$patch_dir/$patch_name"
+
+NEW_JSON=$(echo "$JSON" | jq ".patches += [\"$patch_name\"]")
+"$SCRIPTS"/util/replace.sh "$PACKAGE" "$NEW_JSON"
+
+echo "-- Patch created at $patch_dir/$patch_name"