[gitg] Add expand_home_dir utility

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 0b774ca3813f5d3422293b077cbc6a2a2b25cd2c
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Tue Dec 22 09:56:58 2015 +0100

    Add expand_home_dir utility

 libgitg/gitg-utils.vala |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/libgitg/gitg-utils.vala b/libgitg/gitg-utils.vala
index 48d3576..d29888f 100644
--- a/libgitg/gitg-utils.vala
+++ b/libgitg/gitg-utils.vala
@@ -48,6 +48,32 @@ public class Utils
 
                return name;
        }
+
+       public static string expand_home_dir(string path)
+       {
+               string? homedir = null;
+               int pos = -1;
+
+               if (path.has_prefix("~/"))
+               {
+                       homedir = PlatformSupport.get_user_home_dir();
+                       pos = 1;
+               }
+               else if (path.has_prefix("~"))
+               {
+                       pos = path.index_of_char('/');
+                       var user = path[1:pos];
+
+                       homedir = PlatformSupport.get_user_home_dir(user);
+               }
+
+               if (homedir != null)
+               {
+                       return Path.build_filename(homedir, path.substring(pos + 1));
+               }
+
+               return path;
+       }
 }
 
 }