[polari/wip/fmuellner/meson: 2/4] build: Add back typelib checks

[Florian Müllner <fmuellner src gnome org>]

commit 87f2ebdf6a178203b2ffb466b4680643eb8ac07f
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Oct 18 01:51:22 2016 +0200

    build: Add back typelib checks
    
    The AX_CHECK_GIR* macros are a nice way to catch runtime bugs that
    are triggered by users not updating dependencies. Unfortunately
    the meson developers rejected this functionality for their build
    system, so we have to implement the checks ourselves to not lose
    the feature.
    This is still somewhat inferior to the autoconf macros as it uses
    meson's built-in testing ability, which is only executed when
    explicitly requested by the user; still, getting into the habit
    of asking users to run the tests when debugging their issues should
    be a workable compromise ...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779599

 build-aux/meson/check-gir.js |   46 ++++++++++++++++++++++++++++++++++++++++++
 meson.build                  |   29 ++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 0 deletions(-)
---
diff --git a/build-aux/meson/check-gir.js b/build-aux/meson/check-gir.js
new file mode 100644
index 0000000..03ea778
--- /dev/null
+++ b/build-aux/meson/check-gir.js
@@ -0,0 +1,46 @@
+let Lib = null;
+
+function checkSymbols(symbols) {
+    try {
+        symbols.reduce((prev, cur) => {
+            if (typeof prev[cur] === 'undefined')
+                throw 1;
+            return prev[cur];
+        }, Lib);
+        return true;
+    } catch(e) {
+        if (e === 1)
+            return false;
+        throw e;
+    }
+}
+
+function main(args) {
+    if (args.length < 2) {
+        log('Usave: check-girs.js [NAME] [VERSION] <SYMBOL>');
+        return 1;
+    }
+
+    let [lib, version, symbol] = args;
+    imports.gi.versions[lib] = version;
+
+    try {
+        Lib = imports.gi[lib];
+    } catch(e) {
+        return 1;
+    }
+
+    if (symbol) {
+        let symbolList = symbol.split('.');
+        if (!checkSymbols(symbolList)) {
+            // For methods, we need to check the class' prototype
+            symbolList.splice(-1, 0, 'prototype');
+            if (!checkSymbols(symbolList))
+                return 1;
+        }
+    }
+
+    return 0;
+}
+
+main(ARGV)
diff --git a/meson.build b/meson.build
index 9960923..e5dc5e1 100644
--- a/meson.build
+++ b/meson.build
@@ -54,3 +54,32 @@ subdir('help')
 if (not is_variable('DESTDIR'))
   meson.add_install_script(join_paths(src_auxdir, 'meson-postinstall.sh'))
 endif
+
+if (get_option('buildtype').startswith('debug'))
+  girs = [['GdkPixbuf', '2.0'],
+          ['Gio', '2.0', 'Application.send_notification'],
+          ['GLib', '2.0', 'log_variant'],
+          ['GObject', '2.0'],
+          ['Gspell', '1', 'Entry'],
+          ['Gtk', '3.0'],
+          ['Gtk', '3.0', 'ScrolledWindow.set_propagate_natural_width'],
+          ['Pango', '1.0'],
+          ['PangoCairo', '1.0'],
+          ['Secret', '1'],
+          ['Soup', '2.4'],
+          ['TelepathyGLib', '0.12'],
+          ['TelepathyLogger', '0.2']]
+
+  foreach g : girs
+    gir_name = '@0@-@1@'.format(g[0], g[1])
+    if (g.length() == 3)
+      msg = 'Checking for @0@ in @1@'.format(g[2], gir_name)
+    else
+      msg = 'Checking for @0@'.format(gir_name)
+    endif
+
+    test (msg,
+          gjs_console,
+          args: [join_paths(src_auxdir, 'check-gir.js')] + g)
+  endforeach
+endif