[gnome-shell-extensions/wip/fmuellner/ci: 5/6] build: Optionally syntax-check sources

[Florian Müllner <fmuellner src gnome org>]

commit b90c99b87c3682b073a9b7481f7e657395e01a9e
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Nov 29 22:00:14 2017 +0100

    build: Optionally syntax-check sources
    
    As a pure javascript project, building is really just a glorified
    copy operation, so success doesn't even indicate that sources are
    syntactically correct (a.k.a. "compile-tested"). We can at least
    get some minimal testing by performing some basic syntax checking
    when SpilderMonkey's JS shell is available.
    
    Fixes https://gitlab.gnome.org/GNOME/gnome-shell-extensions/issues/32

 extensions/meson.build | 25 +++++++++++++++++++++----
 meson.build            |  1 +
 2 files changed, 22 insertions(+), 4 deletions(-)
---
diff --git a/extensions/meson.build b/extensions/meson.build
index 30bc053..eba5053 100644
--- a/extensions/meson.build
+++ b/extensions/meson.build
@@ -1,8 +1,9 @@
 extension_schemas = []
+js_sources = extensionlib
 
 metadata_name = 'metadata.json'
 
-foreach e : enabled_extensions
+foreach e : all_extensions
   uuid = e + '@gnome-shell-extensions.gcampax.github.com'
 
   metadata_conf = configuration_data()
@@ -18,11 +19,27 @@ foreach e : enabled_extensions
 
   subdir(e)
 
-  install_data (extension_sources + extension_data + extensionlib,
-    install_dir: join_paths(extensiondir, uuid)
-  )
+  js_sources += extension_sources
+
+  if (enabled_extensions.contains(e))
+    install_data (extension_sources + extension_data + extensionlib,
+      install_dir: join_paths(extensiondir, uuid)
+    )
+  endif
 endforeach
 
 install_data (extension_schemas,
   install_dir: schemadir
 )
+
+foreach js_source : js_sources
+  if (js52.found())
+    path_array = '@0@'.format(js_source).split('/')
+    name = join_paths(path_array[-2], path_array[-1])
+
+    test('Checking syntax of ' + name, js52,
+      args: ['-s', '-c', js_source],
+      workdir: meson.current_source_dir()
+    )
+  endif
+endforeach
diff --git a/meson.build b/meson.build
index 80b1b18..92cf371 100644
--- a/meson.build
+++ b/meson.build
@@ -22,6 +22,7 @@ xsessiondir = join_paths(datadir, 'xsession')
 
 extensionlib = files('lib/convenience.js')
 
+js52 = find_program('js52', required: false)
 sassc = find_program('sassc', required: false)
 
 ver_arr = meson.project_version().split('.')