[gnome-control-center] printers: Add function shift_string_left() and its test

[Marek Kašík <mkasik src gnome org>]

commit 88fa618aca5a1c4c5865dfd688c3c31fb0cb745b
Author: Marek Kasik <mkasik redhat com>
Date:   Tue Jul 29 16:59:37 2014 +0200

    printers: Add function shift_string_left() and its test
    
    shift_string_left() shifts given string by 1 character to the left.
    test-shift.c tests whether function shift_string_left() works correctly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695564

 panels/printers/Makefile.am    |    8 ++++
 panels/printers/pp-utils.c     |   12 ++++++
 panels/printers/pp-utils.h     |    2 +
 panels/printers/shift-test.txt |    9 ++++
 panels/printers/test-shift.c   |   84 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 115 insertions(+), 0 deletions(-)
---
diff --git a/panels/printers/Makefile.am b/panels/printers/Makefile.am
index 3e34194..590601a 100644
--- a/panels/printers/Makefile.am
+++ b/panels/printers/Makefile.am
@@ -66,4 +66,12 @@ desktop_DATA = $(desktop_in_files:.desktop.in=.desktop)
 CLEANFILES = $(desktop_in_files) $(desktop_DATA) $(BUILT_SOURCES)
 EXTRA_DIST = $(resource_files) printers.gresource.xml
 
+noinst_PROGRAMS = test-shift
+test_shift_SOURCES = pp-utils.c pp-utils.h test-shift.c
+test_shift_LDADD = $(PANEL_LIBS) $(PRINTERS_PANEL_LIBS) $(CUPS_LIBS)
+
+EXTRA_DIST += shift-test.txt
+check-local: test-shift
+       $(builddir)/test-shift $(srcdir)/shift-test.txt > /dev/null
+
 -include $(top_srcdir)/git.mk
diff --git a/panels/printers/pp-utils.c b/panels/printers/pp-utils.c
index d4e4d3b..b354679 100644
--- a/panels/printers/pp-utils.c
+++ b/panels/printers/pp-utils.c
@@ -4244,3 +4244,15 @@ canonicalize_device_name (GList         *devices,
 
   return new_name;
 }
+
+void
+shift_string_left (gchar *str)
+{
+  gchar *next;
+
+  if (str != NULL && str[0] != '\0')
+    {
+      next = g_utf8_find_next_char (str, NULL);
+      memmove (str, next, strlen (next) + 1);
+    }
+}
diff --git a/panels/printers/pp-utils.h b/panels/printers/pp-utils.h
index 3850976..6543181 100644
--- a/panels/printers/pp-utils.h
+++ b/panels/printers/pp-utils.h
@@ -318,6 +318,8 @@ gchar      *canonicalize_device_name (GList         *devices,
                                       gint           num_of_dests,
                                       PpPrintDevice *device);
 
+void        shift_string_left (gchar *str);
+
 G_END_DECLS
 
 #endif /* __PP_UTILS_H */
diff --git a/panels/printers/shift-test.txt b/panels/printers/shift-test.txt
new file mode 100644
index 0000000..b9eced4
--- /dev/null
+++ b/panels/printers/shift-test.txt
@@ -0,0 +1,9 @@
+# String, tab, string shifted by 1 position left
+Canon  anon
+-JetDirect     JetDirect
+localhost      ocalhost
+Šípková Růženka        ípková Růženka
+ space space
+[][    ][
+…...   ...
+
diff --git a/panels/printers/test-shift.c b/panels/printers/test-shift.c
new file mode 100644
index 0000000..630ae16
--- /dev/null
+++ b/panels/printers/test-shift.c
@@ -0,0 +1,84 @@
+#include "config.h"
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <locale.h>
+
+#include "pp-utils.h"
+
+int
+main (int argc, char **argv)
+{
+  guint   i;
+  char   *str;
+  char   *contents;
+  char  **lines;
+  char   *locale;
+
+  /* Running in some locales will
+   * break the tests as "ü" will be transliterated to
+   * "ue" in de_DE, and 'u"' in the C locale.
+   *
+   * Work around that by forcing en_US with UTF-8 in
+   * our tests
+   * https://bugzilla.gnome.org/show_bug.cgi?id=650342 */
+
+  locale = setlocale (LC_ALL, "en_US.UTF-8");
+  if (locale == NULL)
+    {
+      g_debug("Missing en_US.UTF-8 locale, ignoring test.");
+      return 0;
+    }
+
+  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+
+  if (g_file_get_contents (argv[1], &contents, NULL, NULL) == FALSE)
+    {
+      g_warning ("Failed to load '%s'", argv[1]);
+      return 1;
+    }
+
+  lines = g_strsplit (contents, "\n", -1);
+  if (lines == NULL)
+    {
+      g_warning ("Test file is empty");
+      return 1;
+    }
+
+  for (i = 0; lines[i] != NULL; i++)
+    {
+      char **items;
+      char  *utf8;
+
+      if (*lines[i] == '#')
+        continue;
+
+      if (*lines[i] == '\0')
+        break;
+
+      items = g_strsplit (lines[i], "\t", -1);
+      str = g_strdup (items[0]);
+      shift_string_left (str);
+      utf8 = g_locale_from_utf8 (items[0], -1, NULL, NULL, NULL);
+      if (g_strcmp0 (str, items[1]) != 0)
+        {
+          g_error ("Result for '%s' doesn't match '%s' (got: '%s')",
+                    utf8, items[1], str);
+        }
+      else
+        {
+          g_debug ("Result for '%s' matches '%s'",
+                   utf8, str);
+        }
+
+      g_free (str);
+      g_free (utf8);
+
+      g_strfreev (items);
+    }
+
+  g_strfreev (lines);
+  g_free (contents);
+
+  return 0;
+}