Small utility collection for dealing with file archives that have dependencies
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/* SPDX-License-Identifier: ISC */
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include "command.h"
extern char *__progname;
static void pretty_print(const char *str, int padd, int len)
{
int i, brk;
next:
while (isspace(*str) && *str != '\n')
++str;
if (!(*str))
return;
if (*str == '\n') {
fputc('\n', stdout);
++str;
len = padd;
goto next;
}
for (i = 0, brk = 0; str[i]; ++i) {
if (str[i] == '<' || str[i] == '[')
++brk;
if (str[i] == '>' || str[i] == ']')
--brk;
if (!brk && isspace(str[i]))
break;
}
if ((len + i) < 80) {
fwrite(str, 1, i, stdout);
str += i;
len += i;
if ((len + 1) < 80) {
fputc(' ', stdout);
++len;
goto next;
}
}
printf("\n%*s", padd, "");
len = padd;
goto next;
}
static void print_cmd_usage(const char *cmd, const char *usage)
{
int padd;
padd = printf("Usage: %s %s ", __progname, cmd);
if ((strlen(usage) + padd) < 80) {
fputs(usage, stdout);
return;
}
pretty_print(usage, padd, padd);
}
static int cmd_help(int argc, char **argv)
{
const char *help;
command_t *cmd;
if (argc < 2)
usage(EXIT_SUCCESS);
if (argc > 2) {
fprintf(stderr, "Too many arguments\n\n"
"Usage: %s help <command>", __progname);
return EXIT_FAILURE;
}
cmd = command_by_name(argv[1]);
if (cmd == NULL) {
fprintf(stderr, "Unknown command '%s'\n\n"
"Try `%s help' for a list of available commands\n",
argv[1], __progname);
return EXIT_FAILURE;
}
print_cmd_usage(cmd->cmd, cmd->usage);
fputs("\n\n", stdout);
if (cmd->l_desc != NULL) {
fputs(cmd->l_desc, stdout);
} else {
help = cmd->s_desc;
if (islower(*help)) {
fputc(toupper(*(help++)), stdout);
pretty_print(help, 0, 1);
} else {
pretty_print(help, 0, 0);
}
}
fputc('\n', stdout);
return EXIT_SUCCESS;
}
static command_t help = {
.cmd = "help",
.usage = "<command>",
.s_desc = "print a help text for a command",
.l_desc =
"Print a help text for a specified command. If no command is specified,\n"
"a generic help text and a list of available commands is shown.\n",
.run_cmd = cmd_help,
};
REGISTER_COMMAND(help)