From 04c11ebb9d505ef082fe3a40593b8b5dace97d04 Mon Sep 17 00:00:00 2001
From: Thierry LARONDE <tlaronde@kergis.com>
Date: Sun, 21 Apr 2024 18:14:49 +0000
Subject: [PATCH] CI: utility to compare semantically pc files between 2 dirs.

---
 auto-meson-pc-cmp.sh | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100755 auto-meson-pc-cmp.sh

diff --git a/auto-meson-pc-cmp.sh b/auto-meson-pc-cmp.sh
new file mode 100755
index 0000000..88d1cd8
--- /dev/null
+++ b/auto-meson-pc-cmp.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+# Compare semantically pc files between two dirs, with same relative
+# pathnames, say one generated by autotools, the other one generated
+# by meson, by not requesting lexical identity but by
+# checking that the same vars are available, and that they eventually 
+# have the same definition, whatever way (with whatever pkconf
+# variable) they have been expressed.
+#
+# Copyright 2024 Thierry LARONDE <tlaronde@kergis.com>
+# SPDX-License-Identifier: MIT
+
+# Pc file paths have to be given fully qualified to be independent
+# from PKG_CONFIG_LIBDIR and PKG_CONFIG_PATH definition.
+#
+test $# -eq 2 && test -d "$1" && test -d "$2"\
+	&& test "${1#/}" != "$1" && test "${2#/}" != "$2" || {
+	echo "Usage: $(basename $0) fqdir1 fqdir2" >&2
+	exit 1
+}
+
+: ${TMPDIR:=/tmp}
+
+log() {
+	printf "$@" >&2
+}
+
+cleantmp() {
+	rm "$TMPDIR"/$$.*
+}
+
+dir1="$1"
+dir2="$2"
+
+# Start by simply comparing the list of pc files between the two dirs.
+#
+(cd "$dir1"; find . -type f -name "*.pc") | sort > "$TMPDIR/$$.1"
+(cd "$dir2"; find . -type f -name "*.pc") | sort > "$TMPDIR/$$.2"
+cmp "$TMPDIR/$$.1" "$TMPDIR/$$.2" 2>/dev/null || {
+	log "Pc files not matching between %s and %s:\n" "$dir1" "$dir2"
+	diff -u "$TMPDIR/$$.1" "$TMPDIR/$$.2" >&2
+	cleantmp
+	exit 1
+}
+
+status=0
+while read pcfile; do
+	pcfile=${pcfile#./}
+	ifile=0
+	for pc in "$dir1/$pcfile" "$dir2/$pcfile"; do
+		ifile=$(($ifile + 1))
+		pkgconf --print-variables "$pc"\
+			| sort\
+			| while read var; do
+				test "$var" != "pcfiledir" || continue
+				pkgconf --variable=$var "$pc"\
+					| sed "s!^!$var=!"
+			done >"$TMPDIR/$$.pc$ifile"
+	done
+	if ! cmp "$TMPDIR/$$.pc1" "$TMPDIR/$$.pc2" 2>/dev/null; then
+		log "!!! %s generated files differ:\n" "$pcfile"
+		diff -U0 "$TMPDIR/$$.pc1" "$TMPDIR/$$.pc2" >&2
+		status=$(($status + 1))
+	fi
+done  <"$TMPDIR/$$.1"
+
+cleantmp
+if test "$status" -ne 0; then
+	log "%d pc files in %s and %s differ semantically.\n" "$status" "$dir1" "$dir2"
+	exit 1
+else
+	exit 0
+fi
-- 
2.11.4.GIT