fish: Add 'man' command which opens the manual.

[libguestfs.git] / fish / man.c

diff --git a/fish/man.c b/fish/man.c
new file mode 100644 (file)
index 0000000..e28e892
--- /dev/null
+++ b/fish/man.c
@@ -0,0 +1,58 @@
+/* guestfish - the filesystem interactive shell
+ * Copyright (C) 2010 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include "fish.h"
+
+/* guestfish man command */
+
+int
+do_man (const char *cmd, int argc, char *argv[])
+{
+  if (argc != 0) {
+    fprintf (stderr, _("use 'man' without parameters to open the manual\n"));
+    return -1;
+  }
+
+  /* We have to restore SIGPIPE to the default action around the
+   * external 'man' command to avoid the warning 'gzip: stdout: Broken pipe'.
+   */
+  struct sigaction sa, old_sa;
+  memset (&sa, 0, sizeof sa);
+  sa.sa_handler = SIG_DFL;
+  sigaction (SIGPIPE, &sa, &old_sa);
+
+  int r = system ("man 1 guestfish");
+
+  sigaction (SIGPIPE, &old_sa, NULL);
+
+  if (r != 0)
+    return -1;
+  if (!WIFEXITED (r) || WEXITSTATUS (r) != 0) {
+    fprintf (stderr, _("the external 'man' program failed\n"));
+    return -1;
+  }
+
+  return 0;
+}