Add the guestfish 'time' command.

><fs> time sfdisk /dev/sda 0 0 0 ,
 elapsed time: 6.12 seconds

fish/Makefile.am

@@ -28,7 +28,8 @@ guestfish_SOURCES = \
 	fish.h \
 	glob.c \
 	lcd.c \
-	more.c
+	more.c \
+	time.c
 
 guestfish_CFLAGS = \
 	-I$(top_builddir)/src -Wall \

fish/fish.c

@@ -727,6 +727,8 @@ issue_command (const char *cmd, char *argv[], const char *pipecmd)
   else if (strcasecmp (cmd, "more") == 0 ||
 	   strcasecmp (cmd, "less") == 0)
     r = do_more (cmd, argc, argv);
+  else if (strcasecmp (cmd, "time") == 0)
+    r = do_time (cmd, argc, argv);
   else
     r = run_action (cmd, argc, argv);
 
@@ -760,6 +762,8 @@ list_builtin_commands (void)
 	  "lcd", _("local change directory"));
   printf ("%-20s %s\n",
 	  "glob", _("expand wildcards in command"));
+  printf ("%-20s %s\n",
+	  "time", _("measure time taken to run command"));
 
   /* actions are printed after this (see list_commands) */
 }
@@ -845,6 +849,12 @@ display_builtin_command (const char *cmd)
 	   strcasecmp (cmd, "q") == 0)
     printf (_("quit - quit guestfish\n"
 	      "     quit\n"));
+  else if (strcasecmp (cmd, "time") == 0)
+    printf (_("time - measure time taken to run command\n"
+	      "    time <command> [<args> ...]\n"
+	      "\n"
+	      "    This runs <command> as usual, and prints the elapsed\n"
+	      "    time afterwards.\n"));
   else
     fprintf (stderr, _("%s: command not known, use -h to list all commands\n"),
 	     cmd);

fish/fish.h

@@ -77,17 +77,21 @@ extern int do_glob (const char *cmd, int argc, char *argv[]);
 /* in more.c */
 extern int do_more (const char *cmd, int argc, char *argv[]);
 
+/* in time.c */
+extern int do_time (const char *cmd, int argc, char *argv[]);
+
 /* This should just list all the built-in commands so they can
  * be added to the generated auto-completion code.
  */
 #define BUILTIN_COMMANDS_FOR_COMPLETION \
-  "help", \
-  "quit", "exit", "q", \
-  "alloc", "allocate", \
-  "echo", \
-  "edit", "vi", "emacs", \
-  "lcd", \
-  "glob", \
-  "more", "less"
+  "help",				\
+  "quit", "exit", "q",		        \
+  "alloc", "allocate",		        \
+  "echo",				\
+  "edit", "vi", "emacs",		\
+  "lcd",				\
+  "glob",				\
+  "more", "less",			\
+  "time"
 
 #endif /* FISH_H */

fish/time.c

@@ -0,0 +1,54 @@
+/* guestfish - the filesystem interactive shell
+ * Copyright (C) 2009 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 <string.h>
+#include <unistd.h>
+
+#include "fish.h"
+
+int
+do_time (const char *cmd, int argc, char *argv[])
+{
+  struct timeval start_t, end_t;
+  int64_t start_us, end_us, elapsed_us;
+
+  if (argc < 1) {
+    fprintf (stderr, _("use 'time command [args...]'\n"));
+    return -1;
+  }
+
+  gettimeofday (&start_t, NULL);
+
+  if (issue_command (argv[0], &argv[1], NULL) == -1)
+    return -1;
+
+  gettimeofday (&end_t, NULL);
+
+  start_us = (int64_t) start_t.tv_sec * 1000000 + start_t.tv_usec;
+  end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec;
+  elapsed_us = end_us - start_us;
+  printf ("elapsed time: %d.%02d seconds\n",
+	  (int) (elapsed_us / 1000000),
+	  (int) ((elapsed_us / 10000) % 100));
+
+  return 0;
+}

guestfish.pod

@@ -419,6 +419,13 @@ NOTE: This will not work reliably for large files
 
 This exits guestfish.  You can also use C<^D> key.
 
+=head2 time
+
+ time command args...
+
+Run the command as usual, but print the elapsed time afterwards.  This
+can be useful for benchmarking operations.
+
 =head1 COMMANDS
 
 @ACTIONS@