[meld/flatpak-ci: 29/31] meld: Move conf.py to be meson templated and add import hackery

[Kai Willadsen <kaiw src gnome org>]

commit 8d975b03c6a73e5c164b13bbee1c503b075d07ba
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Nov 30 06:13:43 2019 +1000

    meld: Move conf.py to be meson templated and add import hackery
    
    The meson templating is a way to move away from the extremely custom
    hacks we have in our distutils helpers, but also it's necessary for
    sanely adding support for multiple flatpak builds.

 bin/meld                     | 17 +++++++++++++++++
 meld/{conf.py => conf.py.in} |  0
 2 files changed, 17 insertions(+)
---
diff --git a/bin/meld b/bin/meld
index 38340b1b..875aedf7 100755
--- a/bin/meld
+++ b/bin/meld
@@ -77,6 +77,23 @@ if os.path.exists(os.path.join(melddir, "meld.doap")):
     uninstalled = True
 devel = os.path.exists(os.path.join(melddir, ".git"))
 
+if uninstalled:
+    # Import system hackery to import conf.py.in without copying it to
+    # have a .py suffix. This is entirely so that we can run from a git
+    # checkout without any user intervention.
+    import importlib.machinery
+    import importlib.util
+
+    loader = importlib.machinery.SourceFileLoader(
+        'meld.conf', './meld/conf.py.in')
+    spec = importlib.util.spec_from_loader(loader.name, loader)
+    mod = importlib.util.module_from_spec(spec)
+    loader.exec_module(mod)
+
+    import meld
+    meld.conf = mod
+    sys.modules['meld.conf'] = mod
+
 import meld.conf  # noqa: E402
 
 # Silence warnings on non-devel releases (minor version is divisible by 2)
diff --git a/meld/conf.py b/meld/conf.py.in
similarity index 100%
rename from meld/conf.py
rename to meld/conf.py.in