3:55 a.m.
This patch lets guestfish show command synopsis if the syntax of command issued
by user is wrong, rather than telling user that the number of parameters is wrong.
Signed-off-by: Hu Tao <hutao(a)cn.fujitsu.com>
---
fish/cmds-gperf.h | 1 +
generator/fish.ml | 33 ++++++++++++---------------------
2 files changed, 13 insertions(+), 21 deletions(-)
diff --git a/fish/cmds-gperf.h b/fish/cmds-gperf.h
index 74db69d..bcb3b5d 100644
--- a/fish/cmds-gperf.h
+++ b/fish/cmds-gperf.h
@@ -25,6 +25,7 @@
struct command_entry {
const char *name; /* Short name. */
const char *help; /* Online help. */
+ const char *synopsis; /* Synopsis. */
/* The run_* function. */
int (*run) (const char *cmd, size_t argc, char *argv[]);
diff --git a/generator/fish.ml b/generator/fish.ml
index 3f53ffa..951b376 100644
--- a/generator/fish.ml
+++ b/generator/fish.ml
@@ -190,6 +190,7 @@ Guestfish will prompt for these separately."
pr "struct command_entry %s_cmd_entry = {\n" name;
pr " .name = \"%s\",\n" name2;
pr " .help = \"%s\",\n" (c_quote text);
+ pr " .synopsis = \"%s\",\n" (c_quote synopsis);
pr " .run = run_%s\n" name;
pr "};\n";
pr "\n";
@@ -393,30 +394,14 @@ Guestfish will prompt for these separately."
if argc_minimum = argc_maximum then (
pr " if (argc != %d) {\n" argc_minimum;
- if argc_minimum = 0 then (
- pr " fprintf (stderr, _(\"%%s should have no
parameters\\n\"), cmd);\n";
- ) else (
- pr " fprintf (stderr, ngettext(\"%%s should have %%d
parameter\\n\",\n";
- pr " \"%%s should have %%d
parameters\\n\",\n";
- pr " %d),\n"
- argc_minimum;
- pr " cmd, %d);\n"
- argc_minimum;
- )
+ pr " ret = -2;\n";
) else if argc_minimum = 0 then (
pr " if (argc > %d) {\n" argc_maximum;
- pr " fprintf (stderr, ngettext(\"%%s should have at most %%d
parameter\\n\",\n";
- pr " \"%%s should have at most %%d
parameters\\n\",\n";
- pr " %d),\n"
- argc_maximum;
- pr " cmd, %d);\n"
- argc_maximum;
+ pr " ret = -2;\n";
) else (
pr " if (argc < %d || argc > %d) {\n" argc_minimum
argc_maximum;
- pr " fprintf (stderr, _(\"%%s should have %%d-%%d
parameter(s)\\n\"), cmd, %d, %d);\n"
- argc_minimum argc_maximum;
+ pr " ret = -2;\n";
);
- pr " fprintf (stderr, _(\"type 'help %%s' for help on
%%s\\n\"), cmd, cmd);\n";
pr " goto out_noargs;\n";
pr " }\n";
@@ -694,10 +679,16 @@ Guestfish will prompt for these separately."
pr "run_action (const char *cmd, size_t argc, char *argv[])\n";
pr "{\n";
pr " const struct command_table *ct;\n";
+ pr " int ret = -1;\n";
pr "\n";
pr " ct = lookup_fish_command (cmd, strlen (cmd));\n";
- pr " if (ct)\n";
- pr " return ct->entry->run (cmd, argc, argv);\n";
+ pr " if (ct) {\n";
+ pr " ret = ct->entry->run (cmd, argc, argv);\n";
+ pr " if (ret == -2) {\n";
+ pr " fprintf (stderr, _(\"usage: %%s\\n\"),
ct->entry->synopsis);\n";
+ pr " fprintf (stderr, _(\"type 'help %%s' for more help on
%%s\\n\"), cmd, cmd);\n";
+ pr " }\n";
+ pr " }\n";
pr " else {\n";
pr " fprintf (stderr, _(\"%%s: unknown command\\n\"), cmd);\n";
pr " if (command_num == 1)\n";
--
1.9.3