[epiphany] Revert recent mkenums changes

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 4e66fbc9404a75ff0a8a8a00ddbf8e9b5b6cd1e9
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Jul 14 12:34:31 2018 -0500

    Revert recent mkenums changes
    
    This fixes #64. See the discussion in !18.

 data/meson.build | 44 +++++++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 15 deletions(-)
---
diff --git a/data/meson.build b/data/meson.build
index 5202ec786..492890e56 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -19,30 +19,44 @@ i18n.merge_file('appdata-file',
   po_dir: '../po'
 )
 
-generate_enums = gnome.mkenums('org.gnome.Epiphany.enums.xml',
-  sources: '../lib/ephy-prefs.h',
-  comments: '<!-- @comment@ -->',
-  fhead: '<schemalist>',
-  vhead: '  <@type@ id="org.gnome.Epiphany.@EnumName@">',
-  vprod: '    <value nick="@valuenick@" value="@valuenum@"/>',
-  vtail: '  </@type@>',
-  ftail: '</schemalist>',
+# We need three custom_target() calls because Meson doesn't have very
+# good support for GSettings yet. First, generate our GSettings enums
+# in the build directory. Then, copy the gschema into the build
+# directory to ensure it is in the same place as the enums file. Then
+# we can run glib-compile-schemas on it. We have to compile schemas in
+# the build directory to ensure that our tests don't fail if run on a
+# system where epiphany is not already installed. epiphany will also
+# look for schemas here if built in developer mode.
+#
+# https://github.com/mesonbuild/meson/issues/1687
+generate_enums = custom_target('gsettings-enums',
+  input: '../lib/ephy-prefs.h',
+  output: 'org.gnome.Epiphany.enums.xml',
+  install: true,
   install_dir: join_paths(datadir, 'glib-2.0', 'schemas'),
+  capture: true,
+  command: [find_program('glib-mkenums'),
+    '--comments', '<!-- @comment@ -->',
+    '--fhead', '<schemalist>',
+    '--vhead', '  <@type@ id="org.gnome.Epiphany.@EnumName@">',
+    '--vprod', '    <value nick="@valuenick@" value="@valuenum@"/>',
+    '--vtail', '  </@type@>',
+    '--ftail', '</schemalist>',
+    '@INPUT@'
+  ]
 )
-# Copy file from source into build for glib-compile-schemas
-# https://github.com/mesonbuild/meson/issues/2219
-# gnome.compile_schemas() also needs a dependencies arg
-configure_file(
+copy_gschema = custom_target('copy-gschema-to-builddir',
   input: 'org.gnome.epiphany.gschema.xml',
-  output: 'org.gnome.epiphany.gschema.xml',
-  configuration: configuration_data()
+  output: 'renamed-hack.gschema.xml',
+  command: ['cp', '@INPUT@', '@OUTPUT@']
 )
 compile_schemas = custom_target('glib-compile-schemas',
   output: 'gschemas.compiled',
+  install: false,
   command: [find_program('glib-compile-schemas'),
     meson.current_build_dir()
   ],
-  depends: generate_enums
+  depends: [generate_enums, copy_gschema]
 )
 install_data('org.gnome.epiphany.gschema.xml',
   install_dir: join_paths(datadir, 'glib-2.0', 'schemas')