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

fish/Makefile.am

@@ -44,6 +44,7 @@ guestfish_SOURCES = \
 	fish.h \
 	glob.c \
 	lcd.c \
+	man.c \
 	more.c \
 	prep.c \
 	rc.c \

fish/fish.c

@@ -622,7 +622,8 @@ script (int prompt)
               "Welcome to guestfish, the libguestfs filesystem interactive shell for\n"
               "editing virtual machine filesystems.\n"
               "\n"
-              "Type: 'help' for help with commands\n"
+              "Type: 'help' for a list of commands\n"
+              "      'man' to read the manual\n"
               "      'quit' to quit the shell\n"
               "\n"));
 
@@ -943,6 +944,9 @@ issue_command (const char *cmd, char *argv[], const char *pipecmd)
     r = do_lcd (cmd, argc, argv);
   else if (STRCASEEQ (cmd, "glob"))
     r = do_glob (cmd, argc, argv);
+  else if (STRCASEEQ (cmd, "man") ||
+           STRCASEEQ (cmd, "manual"))
+    r = do_man (cmd, argc, argv);
   else if (STRCASEEQ (cmd, "more") ||
            STRCASEEQ (cmd, "less"))
     r = do_more (cmd, argc, argv);
@@ -982,9 +986,11 @@ issue_command (const char *cmd, char *argv[], const char *pipecmd)
 void
 list_builtin_commands (void)
 {
-  /* help and quit should appear at the top */
+  /* help, man and quit should appear at the top */
   printf ("%-20s %s\n",
           "help", _("display a list of commands or help on a command"));
+  printf ("%-20s %s\n",
+          "man", _("read the manual"));
   printf ("%-20s %s\n",
           "quit", _("quit guestfish"));
 
@@ -1070,6 +1076,12 @@ display_builtin_command (const char *cmd)
               "    Glob runs <command> with wildcards expanded in any\n"
               "    command args.  Note that the command is run repeatedly\n"
               "    once for each expanded argument.\n"));
+  else if (STRCASEEQ (cmd, "man") ||
+           STRCASEEQ (cmd, "manual"))
+    printf (_("man - read the manual\n"
+              "    man\n"
+              "\n"
+              "    Opens the manual page for guestfish.\n"));
   else if (STRCASEEQ (cmd, "help"))
     printf (_("help - display a list of commands or help on a command\n"
               "     help cmd\n"

fish/fish.h

@@ -100,6 +100,9 @@ extern int do_lcd (const char *cmd, int argc, char *argv[]);
 /* in glob.c */
 extern int do_glob (const char *cmd, int argc, char *argv[]);
 
+/* in man.c */
+extern int do_man (const char *cmd, int argc, char *argv[]);
+
 /* in more.c */
 extern int do_more (const char *cmd, int argc, char *argv[]);
 
@@ -136,6 +139,7 @@ extern char *try_tilde_expansion (char *path);
   "edit", "vi", "emacs",		\
   "lcd",				\
   "glob",				\
+  "man", "manual",                      \
   "more", "less",			\
   "reopen",				\
   "sparse",                             \

fish/guestfish.pod

@@ -27,10 +27,11 @@ guestfish - the libguestfs Filesystem Interactive SHell
  Welcome to guestfish, the libguestfs filesystem interactive shell for
  editing virtual machine filesystems.
  
- Type: 'help' for help with commands
+ Type: 'help' for a list of commands
+       'man' to read the manual
        'quit' to quit the shell
  
- ><fs> help
+ ><fs> man
 
 =head2 From shell scripts
 
@@ -679,6 +680,12 @@ itself.
 
 Note that C<!cd> won't do what you might expect.
 
+=head2 man | manual
+
+ man
+
+Opens the manual page for guestfish.
+
 =head2 more | less
 
  more filename

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;
+}

po/POTFILES.in

@@ -75,6 +75,7 @@ fish/edit.c
 fish/fish.c
 fish/glob.c
 fish/lcd.c
+fish/man.c
 fish/more.c
 fish/prep.c
 fish/rc.c

recipes/clone.example

@@ -8,7 +8,8 @@ $ guestfish -a /tmp/new.img -m /dev/sda1
 Welcome to guestfish, the libguestfs filesystem interactive shell for
 editing virtual machine filesystems.
 
-Type: 'help' for help with commands
+Type: 'help' for a list of commands
+      'man' to read the manual
       'quit' to quit the shell
 
 ><fs> cat /etc/resolv.conf