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-rw-r--r--cmd/service/help.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/cmd/service/help.c b/cmd/service/help.c
new file mode 100644
index 0000000..4fa9951
--- /dev/null
+++ b/cmd/service/help.c
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#include "servicecmd.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;
+ }
+
+ for (cmd = commands; cmd != NULL; cmd = cmd->next) {
+ if (strcmp(cmd->cmd, argv[1]) != 0)
+ continue;
+
+ print_cmd_usage(cmd->cmd, cmd->usage);
+ fputs("\n\n", stdout);
+
+ help = cmd->l_desc ? cmd->l_desc : 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;
+ }
+
+ fprintf(stderr, "Unknown command '%s'\n\n"
+ "Try `%s help' for a list of available commands\n",
+ argv[1], __progname);
+ return EXIT_FAILURE;
+}
+
+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, print a generic help text and a list of "
+ "available commands.",
+ .run_cmd = cmd_help,
+};
+
+REGISTER_COMMAND(help)