From 728dc0319da1867f72838d7e6c4aff7d7f71cc1c Mon Sep 17 00:00:00 2001
From: Rico Tzschichholz <ricotz@ubuntu.com>
Date: Wed, 21 Feb 2024 11:49:10 +0100
Subject: [PATCH] vala: Follow the logic of GIrParser.locate_gir() to find gir
 files

This adds the abilitiy to retrieve GI_GIRDIR from the enviroment,
e.g. while passed to ./configure

See https://gitlab.gnome.org/GNOME/gobject-introspection/merge_requests/258

Fixes https://gitlab.gnome.org/GNOME/vala/issues/1518
---
 configure.ac              |  6 +++++
 vala/valacodecontext.vala | 51 ++++++++++++++++++++++++++++++++++++++-
 vapi/config.vapi          |  1 +
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 869b39a04..f57cfa0ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -194,6 +194,12 @@ PKG_CHECK_MODULES(GMODULE, gmodule-2.0 >= $GLIB_REQUIRED)
 AC_SUBST(GMODULE_CFLAGS)
 AC_SUBST(GMODULE_LIBS)
 
+AC_ARG_VAR([GI_GIRDIR],[Set an alternative system location of gir files])
+AC_MSG_CHECKING([for GI_GIRDIR])
+PKG_CHECK_VAR([GI_GIRDIR], [gobject-introspection-1.0], [girdir], [], [AC_MSG_ERROR([Unable to retrieve girdir from gobject-introspection-1.0.pc])])
+AC_MSG_RESULT([$GI_GIRDIR])
+AC_DEFINE_UNQUOTED(GI_GIRDIR, "$GI_GIRDIR", [Define to system location of gir files])
+
 AC_ARG_WITH(cgraph, AS_HELP_STRING([--with-cgraph], [Required flag for cross-compilation to define capability of graphviz]), [], with_cgraph=check)
 AC_ARG_ENABLE(valadoc, AS_HELP_STRING([--disable-valadoc], [Disable valadoc]), enable_valadoc=$enableval, enable_valadoc=yes)
 AS_IF([test "$VALAC" != :], [FOUND_VALAC_VERION=`$VALAC --version | sed 's/Vala  *//'`
diff --git a/vala/valacodecontext.vala b/vala/valacodecontext.vala
index 7610890fd..cf8119759 100644
--- a/vala/valacodecontext.vala
+++ b/vala/valacodecontext.vala
@@ -688,7 +688,56 @@ public class Vala.CodeContext {
 	}
 
 	public string? get_gir_path (string gir) {
-		return get_file_path (gir + ".gir", "gir-1.0", null, gir_directories);
+		const string GIR_SUFFIX = "gir-1.0";
+		string girname = gir + ".gir";
+		string path = null;
+
+		foreach (unowned string dir in gir_directories) {
+			path = Path.build_path ("/", dir, girname);
+			if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+				return path;
+			}
+		}
+
+		// Search $GI_GIR_PATH
+		unowned string? gi_gir_path = Environment.get_variable ("GI_GIR_PATH");
+		if (gi_gir_path != null) {
+			var gir_dirs = gi_gir_path.split (Path.SEARCHPATH_SEPARATOR_S);
+			foreach (unowned string dir in gir_dirs) {
+				path = Path.build_path ("/", dir, girname);
+				if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+					return path;
+				}
+			}
+		}
+
+		// Search $XDG_DATA_HOME
+		path = Path.build_path ("/", Environment.get_user_data_dir (), GIR_SUFFIX, girname);
+		if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+			return path;
+		}
+
+		// Search $XDG_DATA_DIRS
+		foreach (unowned string dir in Environment.get_system_data_dirs ()) {
+			path = Path.build_path ("/", dir, GIR_SUFFIX, girname);
+			if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+				return path;
+			}
+		}
+
+		// Search $GI_GIRDIR set by user or retrieved from gobject-introspection-1.0.pc
+		path = Path.build_path (Config.GI_GIRDIR, girname);
+		if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+			return path;
+		}
+
+		// Search /usr/share
+		path = Path.build_path ("/", "usr", "share", GIR_SUFFIX, girname);
+		if (FileUtils.test (path, FileTest.EXISTS | FileTest.IS_REGULAR)) {
+			return path;
+		}
+
+		return null;
 	}
 
 	public string? get_gresource_path (string gresource, string resource) {
diff --git a/vapi/config.vapi b/vapi/config.vapi
index c8b5d58a1..9d32a575c 100644
--- a/vapi/config.vapi
+++ b/vapi/config.vapi
@@ -26,4 +26,5 @@ namespace Config {
 	public const string PACKAGE_SUFFIX;
 	public const string PACKAGE_VALADOC_LIBDIR;
 	public const string PACKAGE_VALADOC_ICONDIR;
+	public const string GI_GIRDIR;
 }
-- 
2.47.2