build: add a gen-scanner-test target

This adds a command to re-generate the test data. This needs to be
done when either an XML source file or the scanner's output is
changed.

Signed-off-by: Simon Ser <contact@emersion.fr>

tests/data/README.md

@@ -0,0 +1,3 @@
+To re-generate the test data, run:
+
+    ninja -C build/ gen-scanner-test

tests/meson.build

@@ -75,15 +75,23 @@ endif
 sed_path = find_program('sed').full_path()
 
 if get_option('scanner')
-	test(
-		'scanner-test',
-		find_program('scanner-test.sh'),
-		env: [
+	scanner_test_env = [
 		'TEST_DATA_DIR=@0@/data'.format(meson.current_source_dir()),
 		'TEST_OUTPUT_DIR=@0@/output'.format(meson.current_build_dir()),
 		'SED=@0@'.format(sed_path),
 		'WAYLAND_SCANNER=@0@'.format(wayland_scanner.full_path()),
-		],
+	]
+
+	test(
+		'scanner-test',
+		find_program('scanner-test.sh'),
+		env: scanner_test_env,
+	)
+
+	run_target(
+		'gen-scanner-test',
+		command: find_program('scanner-test-gen.sh'),
+		env: scanner_test_env,
 	)
 endif
 

tests/scanner-test-gen.sh

@@ -0,0 +1,21 @@
+#!/bin/sh -eu
+
+generate() {
+	"$WAYLAND_SCANNER" $1 < "$TEST_DATA_DIR/$2" > "$TEST_DATA_DIR/$3"
+	"$SED" -i -e 's/Generated by wayland-scanner [0-9.]*/SCANNER TEST/' \
+		"$TEST_DATA_DIR/$3"
+}
+
+generate "code" "example.xml" "example-code.c"
+generate "client-header" "example.xml" "example-client.h"
+generate "server-header" "example.xml" "example-server.h"
+
+generate "code" "small.xml" "small-code.c"
+generate "client-header" "small.xml" "small-client.h"
+generate "server-header" "small.xml" "small-server.h"
+
+generate "-c code" "small.xml" "small-code-core.c"
+generate "-c client-header" "small.xml" "small-client-core.h"
+generate "-c server-header" "small.xml" "small-server-core.h"
+
+generate "private-code" "small.xml" "small-private-code.c"