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