Implement "more" and "less" commands in guestfish.

[libguestfs.git] / fish / fish.c

diff --git a/fish/fish.c b/fish/fish.c
index 5b0a065..90740d5 100644 (file)
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -724,6 +724,9 @@ issue_command (const char *cmd, char *argv[], const char *pipecmd)
     r = do_lcd (cmd, argc, argv);
   else if (strcasecmp (cmd, "glob") == 0)
     r = do_glob (cmd, argc, argv);
+  else if (strcasecmp (cmd, "more") == 0 ||
+          strcasecmp (cmd, "less") == 0)
+    r = do_more (cmd, argc, argv);
   else
     r = run_action (cmd, argc, argv);
 
@@ -818,6 +821,21 @@ 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 (strcasecmp (cmd, "more") == 0 ||
+          strcasecmp (cmd, "less") == 0)
+    printf (_("more - view a file in the pager\n"
+             "     more <filename>\n"
+             "\n"
+             "    This is used to view a file in the pager.\n"
+             "\n"
+             "    It is the equivalent of (and is implemented by)\n"
+             "    running \"cat\" and using the pager.\n"
+             "\n"
+             "    Normally it uses $PAGER, but if you use the alias\n"
+             "    \"less\" then it always uses \"less\".\n"
+             "\n"
+             "    NOTE: This will not work reliably for large files\n"
+             "    (> 2 MB) or binary files containing \\0 bytes.\n"));
   else if (strcasecmp (cmd, "help") == 0)
     printf (_("help - display a list of commands or help on a command\n"
              "     help cmd\n"
@@ -959,3 +977,21 @@ add_history_line (const char *line)
   nr_history_lines++;
 #endif
 }
+
+int
+xwrite (int fd, const void *buf, size_t len)
+{
+  int r;
+
+  while (len > 0) {
+    r = write (fd, buf, len);
+    if (r == -1) {
+      perror ("write");
+      return -1;
+    }
+    buf += r;
+    len -= r;
+  }
+
+  return 0;
+}