[gnome-control-center] info: Add helper for pretty hostname to hostname

[Bastien Nocera <hadess src gnome org>]

commit a2885a56d41f5f190bc3d5ad1dab8e43088457a9
Author: Bastien Nocera <hadess hadess net>
Date:   Fri May 13 15:48:45 2011 +0100

    info: Add helper for pretty hostname to hostname
    
    So that we can set the static hostname depending on the value
    of the pretty hostname.

 panels/info/Makefile.am       |   16 ++++-
 panels/info/hostname-helper.c |  173 +++++++++++++++++++++++++++++++++++++++++
 panels/info/hostname-helper.h |   21 +++++
 panels/info/test-hostname.c   |   59 ++++++++++++++
 4 files changed, 267 insertions(+), 2 deletions(-)
---
diff --git a/panels/info/Makefile.am b/panels/info/Makefile.am
index 1a9e81c..7ffee41 100644
--- a/panels/info/Makefile.am
+++ b/panels/info/Makefile.am
@@ -11,13 +11,25 @@ INCLUDES = 						\
 	-I$(top_srcdir)/libgnome-control-center/	\
 	$(NULL)
 
+noinst_PROGRAMS = test-hostname
+test_hostname_SOURCES = hostname-helper.c hostname-helper.h test-hostname.c
+test_hostname_LDADD = $(PANEL_LIBS) $(INFO_PANEL_LIBS)
+test_hostname_CFLAGS = $(INCLUDES)
+
+all-local: check-local
+
+check-local: test-hostname
+	$(builddir)/test-hostname > /dev/null
+
 ccpanelsdir = $(PANELS_DIR)
 ccpanels_LTLIBRARIES = libinfo.la
 
 libinfo_la_SOURCES =		\
 	info-module.c		\
-	cc-info-panel.c	\
-	cc-info-panel.h
+	cc-info-panel.c		\
+	cc-info-panel.h		\
+	hostname-helper.c	\
+	hostname-helper.h
 
 libinfo_la_LIBADD = $(PANEL_LIBS) $(INFO_PANEL_LIBS)
 libinfo_la_LDFLAGS = $(PANEL_LDFLAGS)
diff --git a/panels/info/hostname-helper.c b/panels/info/hostname-helper.c
new file mode 100644
index 0000000..3225a8f
--- /dev/null
+++ b/panels/info/hostname-helper.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2011 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <glib.h>
+#include <string.h>
+
+#include "hostname-helper.h"
+
+static char *
+allowed_chars (void)
+{
+	GString *s;
+	char i;
+
+	s = g_string_new (NULL);
+	for (i = 'a'; i <= 'z'; i++)
+		g_string_append_c (s, i);
+	for (i = 'A'; i <= 'Z'; i++)
+		g_string_append_c (s, i);
+	for (i = '0'; i <= '9'; i++)
+		g_string_append_c (s, i);
+	g_string_append_c (s, '-');
+
+	return g_string_free (s, FALSE);
+}
+
+static char *
+remove_leading_dashes (char *input)
+{
+	char *start;
+
+	for (start = input; *start && (*start == '-'); start++)
+		;
+
+	g_memmove (input, start, strlen (start) + 1);
+
+	return input;
+}
+
+static gboolean
+is_empty (const char *input)
+{
+	if (input == NULL ||
+	    *input == '\0')
+		return TRUE;
+	return FALSE;
+}
+
+static char *
+remove_trailing_dashes (char *input)
+{
+	int len;
+
+	len = strlen (input);
+	while (len--) {
+		if (input[len] == '-')
+			input[len] = '\0';
+		else
+			break;
+	}
+	return input;
+}
+
+static char *
+remove_apostrophes (char *input)
+{
+	char *apo;
+
+	while ((apo = strchr (input, '\'')) != NULL)
+		g_memmove (apo, apo + 1, strlen (apo));
+	return input;
+}
+
+static char *
+remove_duplicate_dashes (char *input)
+{
+	char *dashes;
+
+	while ((dashes = strstr (input, "--")) != NULL)
+		g_memmove (dashes, dashes + 1, strlen (dashes));
+	return input;
+}
+
+#define CHECK	if (is_empty (result)) goto bail
+
+char *
+pretty_hostname_to_static (const char *pretty,
+			   gboolean    for_display)
+{
+	char *result;
+	char *valid_chars;
+
+	g_return_val_if_fail (pretty != NULL, NULL);
+	g_return_val_if_fail (g_utf8_validate (pretty, -1, NULL), NULL);
+
+	g_debug ("Input: '%s'", pretty);
+
+	/* Transform the pretty hostname to ASCII */
+	result = g_convert (pretty,
+			    -1,
+			    "ASCII//TRANSLIT//IGNORE",
+			    "UTF-8",
+			    NULL,
+			    NULL,
+			    NULL);
+	g_debug ("\ttranslit: '%s'", result);
+
+	CHECK;
+
+	/* Remove apostrophes */
+	result = remove_apostrophes (result);
+	g_debug ("\tapostrophes: '%s'", result);
+
+	CHECK;
+
+	/* Remove all the not-allowed chars */
+	valid_chars = allowed_chars ();
+	result = g_strcanon (result, valid_chars, '-');
+	g_free (valid_chars);
+	g_debug ("\tcanon: '%s'", result);
+
+	CHECK;
+
+	/* Remove the leading dashes */
+	result = remove_leading_dashes (result);
+	g_debug ("\tleading: '%s'", result);
+
+	CHECK;
+
+	/* Remove trailing dashes */
+	result = remove_trailing_dashes (result);
+	g_debug ("\ttrailing: '%s'", result);
+
+	CHECK;
+
+	/* Remove duplicate dashes */
+	result = remove_duplicate_dashes (result);
+	g_debug ("\tduplicate: '%s'", result);
+
+	CHECK;
+
+	/* Lower case */
+	if (!for_display) {
+		char *tmp;
+
+		tmp = g_ascii_strdown (result, -1);
+		g_free (result);
+		result = tmp;
+	}
+
+	return result;
+
+bail:
+	g_free (result);
+	return g_strdup ("localhost");
+}
+#undef CHECK
diff --git a/panels/info/hostname-helper.h b/panels/info/hostname-helper.h
new file mode 100644
index 0000000..737bf57
--- /dev/null
+++ b/panels/info/hostname-helper.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2011 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+char *pretty_hostname_to_static (const char *pretty,
+				 gboolean    for_display);
diff --git a/panels/info/test-hostname.c b/panels/info/test-hostname.c
new file mode 100644
index 0000000..fc8afce
--- /dev/null
+++ b/panels/info/test-hostname.c
@@ -0,0 +1,59 @@
+#include "config.h"
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <locale.h>
+
+#include "hostname-helper.h"
+
+struct {
+	char *input;
+	char *output_display;
+	char *output_real;
+} tests[] = {
+	{ "Lennart's PC", "Lennarts-PC", "lennarts-pc" },
+	{ "Müllers Computer", "Mullers-Computer", "mullers-computer" },
+	{ "Voran!", "Voran", "voran" },
+	{ "Es war einmal ein Männlein", "Es-war-einmal-ein-Mannlein", "es-war-einmal-ein-mannlein" },
+	{ "Jawoll. Ist doch wahr!", "Jawoll-Ist-doch-wahr", "jawoll-ist-doch-wahr" },
+	{ "ã?¬ã??ã?¼ã??", "localhost", "localhost" },
+	{ "!!!", "localhost", "localhost" },
+	{ "...zack!!! zack!...", "zack-zack", "zack-zack" },
+	{ "Bãstien's computer... Foo-bar", "Bastiens-computer-Foo-bar", "bastiens-computer-foo-bar" },
+	{ "", "localhost", "localhost" },
+};
+
+int main (int argc, char **argv)
+{
+	char *result;
+	guint i;
+
+	setlocale (LC_ALL, "");
+	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+
+	/* FIXME:
+	 * - Tests don't work in non-UTF-8 locales
+	 * - They also fail in de_DE.UTF-8 because of "ü" -> "ue" conversions */
+
+	for (i = 0; i < G_N_ELEMENTS (tests); i++) {
+		result = pretty_hostname_to_static (tests[i].input, FALSE);
+		if (g_strcmp0 (result, tests[i].output_real) != 0)
+			g_error ("Result for '%s' doesn't match '%s' (got: '%s')",
+				 tests[i].input, tests[i].output_real, result);
+		else
+			g_debug ("Result for '%s' matches '%s'",
+				 tests[i].input, result);
+		g_free (result);
+
+		result = pretty_hostname_to_static (tests[i].input, TRUE);
+		if (g_strcmp0 (result, tests[i].output_display) != 0)
+			g_error ("Result for '%s' doesn't match '%s' (got: '%s')",
+				 tests[i].input, tests[i].output_display, result);
+		else
+			g_debug ("Result for '%s' matches '%s'",
+				 tests[i].input, result);
+		g_free (result);
+	}
+
+	return 0;
+}