[glade] Add glade_utils_boolean_from_string() to the zoo

[Juan Pablo Ugarte <jpu src gnome org>]

commit 7f9cfb30062b1087b78693a3d96af76c7702946b
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Sat Nov 18 12:01:12 2017 -0300

    Add glade_utils_boolean_from_string() to the zoo

 gladeui/glade-utils.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 gladeui/glade-utils.h |    2 ++
 2 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/gladeui/glade-utils.c b/gladeui/glade-utils.c
index dcfd9d6..73b5d25 100644
--- a/gladeui/glade-utils.c
+++ b/gladeui/glade-utils.c
@@ -1587,6 +1587,53 @@ glade_utils_value_from_string (GType type,
   return NULL;
 }
 
+/**
+ * glade_utils_boolean_from_string:
+ * @string: the string to convert
+ * @value: return location
+ *
+ * Parse a boolean value
+ *
+ * Returns: True if there was an error on the conversion.
+ */
+gboolean
+glade_utils_boolean_from_string (const gchar *string, gboolean *value)
+{
+  if (string)
+    {
+      const gchar *c = string;
+
+      /* Skip white spaces */
+      while (g_ascii_isspace (*c))
+        c++;
+
+      /* We only need the first char */
+      switch (*c)
+        {
+          case '1':
+          case 't':
+          case 'T':
+          case 'y':
+          case 'Y':
+            if (value)
+              *value = TRUE;
+            return FALSE;
+          break;
+
+          case '0':
+          case 'f':
+          case 'F':
+          case 'n':
+          case 'N':
+            if (value)
+              *value = FALSE;
+            return FALSE;
+          break;
+        }
+    }
+
+  return TRUE;
+}
 
 /**
  * glade_utils_string_from_value:
diff --git a/gladeui/glade-utils.h b/gladeui/glade-utils.h
index 9c8839c..e5d928d 100644
--- a/gladeui/glade-utils.h
+++ b/gladeui/glade-utils.h
@@ -67,6 +67,8 @@ GValue           *glade_utils_value_from_string   (GType               type,
                                                   const gchar        *string,
                                                   GladeProject       *project);
 gchar            *glade_utils_string_from_value   (const GValue       *value);
+gboolean          glade_utils_boolean_from_string (const gchar *string,
+                                                  gboolean *value);
 
 /* Devhelp */
 gboolean          glade_util_have_devhelp          (void);