1 files changed, 95 insertions, 0 deletions
diff --git a/options.c b/options.c
new file mode 100644
index 0000000..2619602
--- /dev/null
+++ b/options.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "options.h"
+
+
+struct options parse_options(int argc, char **argv) {
+  size_t filters_cap = 32, filters_len = 0;
+  struct filter_rule *filters = malloc(filters_cap * sizeof(struct filter_rule));
+
+  size_t cachetags_cap = 32, cachetags_len = 0;
+  char **cachetags = malloc(cachetags_cap * sizeof(char*));
+
+  char *rootpath = NULL;
+
+  int print_depth = 1;
+
+  bool debug = false;
+
+  for (int i = 1; i < argc; i++) {
+    if (argv[i][0] != '-') {
+      if (rootpath) {
+        fprintf(stderr, "Multiple root paths given\n");
+        exit(1);
+      }
+      rootpath = strdup(argv[i]);
+
+    } else if (strcmp(argv[i], "--exclude") == 0) {
+      if (i + 1 >= argc) {
+        fprintf(stderr, "'--exclude' takes an argument\n");
+        exit(1);
+      }
+
+      if (filters_len >= filters_cap) {
+        filters_cap *= 2;
+        filters = realloc(filters, filters_cap * sizeof(struct filter_rule));
+      }
+      struct filter_rule rule = parse_exclude_rule(argv[i+1]);
+      filters[filters_len++] = rule;
+
+      i++;
+
+    } else if (strcmp(argv[i], "--exclude-if-present") == 0) {
+      if (i + 1 >= argc) {
+        fprintf(stderr, "'--exclude-if-present' takes an argument\n");
+        exit(1);
+      }
+
+      if (cachetags_len >= cachetags_cap) {
+        cachetags_cap *= 2;
+        cachetags = realloc(cachetags, cachetags_cap * sizeof(char*));
+      }
+      cachetags[cachetags_len++] = strdup(argv[i+1]);
+
+      i++;
+
+    } else if (strcmp(argv[i], "-d") == 0) {
+      if (i + 1 >= argc) {
+        fprintf(stderr, "'-d' takes an argument\n");
+        exit(1);
+      }
+
+      char *endp;
+      print_depth = strtol(argv[i+1], &endp, 10);
+      if (!*argv[i+1] || *endp) {
+        fprintf(stderr, "Invalid argument to '-d': '%s'\n", argv[i+1]);
+        exit(1);
+      }
+
+      i++;
+
+    } else if (strcmp(argv[i], "--debug") == 0) {
+      debug = true;
+
+    } else {
+      fprintf(stderr, "Unrecognised argument: '%s'\n", argv[i]);
+      exit(1);
+    }
+  }
+
+  if (rootpath == NULL) {
+    fprintf(stderr, "No root path provided\n");
+    exit(1);
+  }
+
+  return (struct options){
+    .nfilters = filters_len,
+    .filters = filters,
+    .ncachetags = cachetags_len,
+    .cachetags = cachetags,
+    .rootpath = rootpath,
+    .print_depth = print_depth,
+    .debug = debug,
+  };
+}