[balsa] Check environment variable in address book widgets

[Peter Bloomfield <peterb src gnome org>]

commit 9ec2d719fc965e957c542d1d9fe3663a0556dd5a
Author: Albrecht Dreß <albrecht dress arcor de>
Date:   Sun Oct 23 11:58:27 2016 -0400

    Check environment variable in address book widgets
    
    Disable header bars in the address book widgets if the
    environment variable BALSA_DIALOG_HEADERBAR is 0.
    
        * src/ab-window.c (balsa_ab_window_new): respect
        BALSA_DIALOG_HEADERBAR environment variable.
    
    Signed-off-by: Peter Bloomfield <PeterBloomfield bellsouth net>

 ChangeLog       |   10 +++++++++-
 src/ab-window.c |   12 +++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index a9170d3..af46146 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2016-10-23  Albrecht Dreß
+
+Disable header bars in the address book widgets if the
+environment variable BALSA_DIALOG_HEADERBAR is 0.
+
+       * src/ab-window.c (balsa_ab_window_new): respect
+       BALSA_DIALOG_HEADERBAR environment variable.
+
 2016-10-23  Peter Bloomfield  <pbloomfield bellsouth net>
 
        We no longer use libiconv.
@@ -9,7 +17,7 @@
 2016-10-21  Peter Bloomfield  <pbloomfield bellsouth net>
 
        Fix deprecation issues in gtk 3.22
-       
+
        Replace gtk_window_set_wmclass, which is deprecated in gtk 3.22,
        with gtk_window_set_role.
 
diff --git a/src/ab-window.c b/src/ab-window.c
index 80ff2b1..01673d4 100644
--- a/src/ab-window.c
+++ b/src/ab-window.c
@@ -115,9 +115,19 @@ balsa_ab_window_new(gboolean composing, GtkWindow* parent)
 {
     GtkWidget *ret;
     BalsaAbWindow *ab;
+    gint use_headerbar = 1;
+#if GTK_CHECK_VERSION(3, 12, 0)
+       const gchar *dialog_env;
+
+    /* header bar configuration */
+       dialog_env = g_getenv("BALSA_DIALOG_HEADERBAR");
+       if ((dialog_env != NULL) && (atoi(dialog_env) == 0)) {
+               use_headerbar = 0;
+       }
+#endif
 
     ret = g_object_new(BALSA_TYPE_AB_WINDOW,
-                       "use-header-bar", TRUE,
+                       "use-header-bar", use_headerbar,
                        "transient-for", parent,
                        NULL);
     g_return_val_if_fail(ret != NULL, NULL);