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Add the help command.

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This commit is contained in:
Jef Driesen 2015-12-28 15:36:29 +01:00
parent 57a54f824c
commit 38c9ebc74e
4 changed files with 170 additions and 27 deletions
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1
examples/Makefile.am
View File

@ -9,5 +9,6 @@ dctool_SOURCES = \
common.c \
dctool.h \
dctool.c \
dctool_help.c \
utils.h \
utils.c

83
examples/dctool.c
View File

@ -48,6 +48,7 @@
#endif
static const dctool_command_t *g_commands[] = {
&dctool_help,
NULL
};
@ -70,6 +71,51 @@ dctool_command_find (const char *name)
return g_commands[i];
}
void
dctool_command_showhelp (const dctool_command_t *command)
{
if (command == NULL) {
unsigned int maxlength = 0;
for (size_t i = 0; g_commands[i] != NULL; ++i) {
unsigned int length = strlen (g_commands[i]->name);
if (length > maxlength)
maxlength = length;
}
printf (
"A simple command line interface for the libdivecomputer library\n"
"\n"
"Usage:\n"
" dctool [options] <command> [<args>]\n"
"\n"
"Options:\n"
#ifdef HAVE_GETOPT_LONG
" -h, --help Show help message\n"
" -d, --device <device> Device name\n"
" -f, --family <family> Device family type\n"
" -m, --model <model> Device model number\n"
" -l, --logfile <logfile> Logfile\n"
" -q, --quiet Quiet mode\n"
" -v, --verbose Verbose mode\n"
#else
" -h Show help message\n"
" -d <device> Device name\n"
" -f <family> Family type\n"
" -m <model> Model number\n"
" -l <logfile> Logfile\n"
" -q Quiet mode\n"
" -v Verbose mode\n"
#endif
"\n"
"Available commands:\n");
for (size_t i = 0; g_commands[i] != NULL; ++i) {
printf (" %-*s%s\n", maxlength + 3, g_commands[i]->name, g_commands[i]->description);
}
printf ("\nSee 'dctool help <command>' for more information on a specific command.\n\n");
} else {
printf ("%s\n\n%s\n", command->description, command->usage);
}
}
int
dctool_cancel_cb (void *userdata)
{
@ -165,34 +211,17 @@ main (int argc, char *argv[])
argv += optind;
optind = RESET;
// Show help message.
// Translate the help option into a command.
char *argv_help[] = {(char *) "help", NULL, NULL};
if (help || argv[0] == NULL) {
printf (
"A simple command line interface for the libdivecomputer library\n"
"\n"
"Usage:\n"
" dctool [options] <command> [<args>]\n"
"\n"
"Options:\n"
#ifdef HAVE_GETOPT_LONG
" -h, --help Show help message\n"
" -d, --device <device> Device name\n"
" -f, --family <family> Device family type\n"
" -m, --model <model> Device model number\n"
" -l, --logfile <logfile> Logfile\n"
" -q, --quiet Quiet mode\n"
" -v, --verbose Verbose mode\n"
#else
" -h Show help message\n"
" -d <device> Device name\n"
" -f <family> Family type\n"
" -m <model> Model number\n"
" -l <logfile> Logfile\n"
" -q Quiet mode\n"
" -v Verbose mode\n"
#endif
"\n");
return EXIT_SUCCESS;
if (argv[0]) {
argv_help[1] = argv[0];
argv = argv_help;
argc = 2;
} else {
argv = argv_help;
argc = 1;
}
}
// Try to find the command.

8
examples/dctool.h
View File

@ -42,6 +42,14 @@ typedef struct dctool_command_t {
const char *usage;
} dctool_command_t;
extern const dctool_command_t dctool_help;
const dctool_command_t *
dctool_command_find (const char *name);
void
dctool_command_showhelp (const dctool_command_t *command);
int
dctool_cancel_cb (void *userdata);

105
examples/dctool_help.c Normal file
View File

@ -0,0 +1,105 @@
/*
* libdivecomputer
*
* Copyright (C) 2015 Jef Driesen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <libdivecomputer/context.h>
#include <libdivecomputer/descriptor.h>
#include "dctool.h"
#include "utils.h"
static int
dctool_help_run (int argc, char *argv[], dc_context_t *context, dc_descriptor_t *descriptor)
{
// Default option values.
unsigned int help = 0;
// Parse the command-line options.
int opt = 0;
const char *optstring = "h";
#ifdef HAVE_GETOPT_LONG
struct option options[] = {
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0 }
};
while ((opt = getopt_long (argc, argv, optstring, options, NULL)) != -1) {
#else
while ((opt = getopt (argc, argv, optstring)) != -1) {
#endif
switch (opt) {
case 'h':
help = 1;
break;
default:
return EXIT_FAILURE;
}
}
argc -= optind;
argv += optind;
// Show help message.
if (help) {
dctool_command_showhelp (&dctool_help);
return EXIT_SUCCESS;
}
// Try to find the command.
const dctool_command_t *command = NULL;
if (argv[0] != NULL) {
command = dctool_command_find (argv[0]);
if (command == NULL) {
message ("Unknown command %s.\n", argv[0]);
return EXIT_FAILURE;
}
}
// Show help message for the command.
dctool_command_showhelp (command);
return EXIT_SUCCESS;
}
const dctool_command_t dctool_help = {
dctool_help_run,
DCTOOL_CONFIG_NONE,
"help",
"Show basic help instructions",
"Usage:\n"
" dctool help [options] [<command>]\n"
"\n"
"Options:\n"
#ifdef HAVE_GETOPT_LONG
" -h, --help Show help message\n"
#else
" -h Show help message\n"
#endif
};