1 files changed, 131 insertions, 0 deletions
diff --git a/src/options.c b/src/options.c
new file mode 100644
index 0000000..848eaf5
--- /dev/null
+++ b/src/options.c
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+/* Copyright 2025 Thorsten Töpper
+ *
+ * options - 
+ *
+ * vim:ts=4:sw=4:expandtab
+ */
+#include <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include <stdbool.h>
+
+
+#include "output.h"
+#include "options.h"
+
+
+
+
+
+/* === GLOBAL VARIABLES === */
+struct option long_options[] = {
+    { "reverse-sort", no_argument, 0, 0 },
+    { "show-hidden-entries", no_argument, 0, 0 },
+    { "sort-by", required_argument, 0, 0 },
+    { "long-timestamp", no_argument, 0, 0 },
+    { 0, 0, 0, 0 }
+};
+bool option_sort_reverse_order = false;
+enum esort_type option_sort_type = SORT_BY_SIZE;
+bool option_show_hidden_entries = false;
+bool option_timestamp_long = false;
+
+
+
+/* === IMPLEMENTATION === */
+
+void usage(char *executable) {
+    fprintf(stderr, "Call: %s OPTIONS path_to_open\n", executable);
+    fprintf(stderr, "\nOPTIONS are\n");
+    /* long name, short name, optional argument, explanation */
+    fprintf(stderr, " %-25s %2s %10s %s\n", "--long-timestamp", "-t", "",
+            "Print timestamp in long form yyyymmdd HH:MM:SS ZONE");
+    fprintf(stderr, " %-25s %2s %10s %s\n", "--reverse-sort", "", "",
+            "Sort reversed");
+    fprintf(stderr, " %-25s %2s %10s %s\n", "--show-hidden-entries", "-v", "",
+            "Show hidden entries in the directory");
+    fprintf(stderr, " %-25s %2s %10s %s\n", "--sort-by", "", "size|time",
+            "Sort either by time or size");
+}
+
+
+void set_option(const char *option_name, char *option_argument) {
+
+    DBGTRC("DEBUG: called with option_name '%s' and option_argument '%s'\n",
+            option_name, option_argument);
+
+    if (option_name == NULL)
+        return;
+
+    /* options WITHOUT arguments */
+    if (strcmp(option_name, "show-hidden-entries") == 0) {
+        option_show_hidden_entries = true;
+        return;
+    }
+
+    if (strcmp(option_name, "long-timestamp") == 0) {
+        option_timestamp_long = true;
+        return;
+    }
+
+    if (strcmp("reverse-sort", option_name) == 0) {
+        option_sort_reverse_order = true;
+        return;
+    }
+
+    /* options WITH arguments */
+    if (option_argument == NULL || option_argument[0] == '\0') {
+        LOGERR("ERROR: option_name %s with missing option_argument\n",
+                option_name);
+        return;
+    }
+
+    if (strcmp(option_name, "sort-by") == 0) {
+        if (strncmp("size", option_argument, 4) == 0) {
+            option_sort_type = SORT_BY_SIZE;
+        } else if (strncmp("time", option_argument, 4) == 0) {
+            option_sort_type = SORT_BY_TIME;
+        } else {
+            LOGERR("WARNING: '%s' is an invalig argument for %s\n",
+                    option_argument, option_name);
+        }
+        return;
+    }
+
+    LOGERR("ERROR: Option '%s' not recognized\n.", option_name);
+}
+
+int parse_arguments(int argc, char **argv) {
+    int c = 0, index;
+
+    while(1) {
+        index = 0;
+        c = getopt_long(argc, argv, "tv", long_options, &index);
+
+        if (c == -1) {
+            break;
+        }
+
+        switch (c) {
+            case 0:
+                set_option(long_options[index].name, optarg);
+                break;
+            case 't':
+                option_timestamp_long = true;
+                break;
+            case 'v':
+                option_show_hidden_entries = true;
+                break;
+            case '?':
+                break;
+            default:
+                LOGERR("ERROR: unrecognized option 0x%02X '%c'\n", c, c);
+                break;
+        }
+    }
+
+    return optind;
+}
+