From 9a88f7da453eadc72d8f333700dbd80777feecd1 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@tele2.at>
Date: Sun, 25 Feb 2018 14:33:19 +0100
Subject: Initial commit

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
---
 servicecmd/help.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 servicecmd/help.c

(limited to 'servicecmd/help.c')

diff --git a/servicecmd/help.c b/servicecmd/help.c
new file mode 100644
index 0000000..6cd816e
--- /dev/null
+++ b/servicecmd/help.c
@@ -0,0 +1,112 @@
+#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)
-- 
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