1 files changed, 107 insertions, 0 deletions
diff --git a/tools/lint/cmd_help.c b/tools/lint/cmd_help.c
new file mode 100644
index 0000000..a1ee3f6
--- /dev/null
+++ b/tools/lint/cmd_help.c
@@ -0,0 +1,107 @@
+/**
+ * @file cmd_help.c
+ * @author Adam Piecek <piecek@cesnet.cz>
+ * @brief 'help' command of the libyang's yanglint tool.
+ *
+ * Copyright (c) 2023-2023 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#define _GNU_SOURCE
+
+#include "cmd.h"
+
+#include <getopt.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "libyang.h"
+
+#include "common.h"
+#include "yl_opt.h"
+
+void
+cmd_help_help(void)
+{
+    printf("Usage: help [cmd ...]\n");
+}
+
+int
+cmd_help_opt(struct yl_opt *yo, const char *cmdline, char ***posv, int *posc)
+{
+    int rc = 0, argc = 0;
+    int opt, opt_index;
+    struct option options[] = {
+        {"help", no_argument, NULL, 'h'},
+        {NULL, 0, NULL, 0}
+    };
+
+    if ((rc = parse_cmdline(cmdline, &argc, &yo->argv))) {
+        return rc;
+    }
+
+    while ((opt = getopt_long(argc, yo->argv, commands[CMD_HELP].optstring, options, &opt_index)) != -1) {
+        if (opt == 'h') {
+            cmd_help_help();
+            return 1;
+        } else {
+            YLMSG_E("Unknown option.");
+            return 1;
+        }
+    }
+
+    *posv = &yo->argv[optind];
+    *posc = argc - optind;
+
+    return rc;
+}
+
+static void
+print_generic_help(void)
+{
+    printf("Available commands:\n");
+    for (uint16_t i = 0; commands[i].name; i++) {
+        if (commands[i].helpstring != NULL) {
+            printf("  %-15s %s\n", commands[i].name, commands[i].helpstring);
+        }
+    }
+}
+
+int
+cmd_help_exec(struct ly_ctx **ctx, struct yl_opt *yo, const char *posv)
+{
+    (void)ctx, (void)yo;
+
+    if (!posv) {
+        print_generic_help();
+    } else {
+        /* print specific help for the selected command(s) */
+
+        int8_t match = 0;
+
+        /* get the command of the specified name */
+        for (uint16_t i = 0; commands[i].name; i++) {
+            if (strcmp(posv, commands[i].name) == 0) {
+                match = 1;
+                if (commands[i].help_func != NULL) {
+                    commands[i].help_func();
+                } else {
+                    printf("%s: %s\n", posv, commands[i].helpstring);
+                }
+                break;
+            }
+        }
+        if (!match) {
+            /* if unknown command specified, print the list of commands */
+            printf("Unknown command \'%s\'\n", posv);
+            print_generic_help();
+        }
+    }
+
+    return 0;
+}