From e19ee5d1bc28d97007ec1d454c96b72e10f5c1bf Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Thu, 17 Nov 2022 22:10:08 +0100
Subject: [PATCH] build: add gen-test-data run target

This makes it easier to re-generate the test diffs. The build system
will properly set DI_EDID_DECODE/DI_EDID_PRINT (and will rebuild
these tools if they are out-of-date).

Signed-off-by: Simon Ser <contact@emersion.fr>
---
 README.md        |  4 ++--
 meson.build      |  2 +-
 test/meson.build | 29 ++++++++++++++++++++++-------
 3 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/README.md b/README.md
index 70f3803..c9503ed 100644
--- a/README.md
+++ b/README.md
@@ -50,8 +50,8 @@ libdisplay-info is built using [Meson]:
 The low-level EDID library is tested against [edid-decode]. `test/data/`
 contains a small collection of EDID blobs and diffs between upstream
 `edid-decode` and our `di-edid-decode` clone. Our CI ensures the diffs are
-up-to-date. A patch should never make the diffs grow larger. To add a new EDID
-blob or update a diff, use `test/edid-decode-diff.sh test/data/<edid>`.
+up-to-date. A patch should never make the diffs grow larger. To re-generate the
+test data, run `ninja -C build/ gen-test-data`.
 
 To run the test suite locally, you need to use [edid-decode] of the git
 revision mentioned in `.gitlab-ci.yml`. Otherwise you may experience false
diff --git a/meson.build b/meson.build
index ebc3a13..d5ccdb8 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@ project(
 	'c',
 	version: '0.0.0',
 	license: 'MIT',
-	meson_version: '>= 0.55.0',
+	meson_version: '>= 0.57.0',
 	default_options: [
 		'c_std=c11',
 		'warning_level=3',
diff --git a/test/meson.build b/test/meson.build
index 1fe6d10..ae5861e 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -29,24 +29,39 @@ test_cases = [
 	'viewsonic-vp2768-dp',
 ]
 
+test_env = [
+	'REF_EDID_DECODE=' + ref_edid_decode.full_path(),
+	'DI_EDID_DECODE=' + di_edid_decode.full_path(),
+	'DI_EDID_PRINT=' + di_edid_print.full_path(),
+]
+
 foreach tc : test_cases
 	test(
 		'decode-' + tc,
 		test_harness,
 		args: [files('data/' + tc + '.edid')],
-		env: [
-			'REF_EDID_DECODE=' + ref_edid_decode.full_path(),
-			'DI_EDID_DECODE=' + di_edid_decode.full_path(),
-		],
+		env: test_env,
 		depends: [di_edid_decode],
 	)
 	test(
 		'print-' + tc,
 		print_harness,
 		args: [files('data/' + tc + '.edid')],
-		env: [
-			'DI_EDID_PRINT=' + di_edid_print.full_path(),
-		],
+		env: test_env,
 		depends: [di_edid_print],
 	)
 endforeach
+
+test_gen = find_program('./edid-decode-diff.sh', native: true)
+
+gen_targets = []
+foreach tc : test_cases
+	gen_targets += files('data/' + tc + '.edid')
+endforeach
+
+run_target(
+	'gen-test-data',
+	command: [test_gen] + gen_targets,
+	depends: [di_edid_decode, di_edid_print],
+	env: test_env,
+)