Add argsv0.4.0

- add color arg
- add lines arg

1 files changed, 64 insertions, 0 deletions

diff --git a/src/lib/arg.c b/src/lib/arg.c
new file mode 100644
index 0000000..6178156
--- /dev/null
+++ b/src/lib/arg.c
@@ -0,0 +1,64 @@
+#include "arg.h"
+#include "util.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct config conf;
+void argerr(char *r, char *arg) {
+  fprintf(stderr, "lat: %s '%s'\n", r, arg);
+  exit(EXIT_FAILURE);
+}
+
+void parselongarg(char *arg) {
+  if (strcmp(arg, "--color") == 0) {
+    conf.color = !conf.color;
+    return;
+  }
+
+  if (strcmp(arg, "--lines") == 0) {
+    conf.lines = !conf.lines;
+    return;
+  }
+
+  argerr("unrecognized arg", arg);
+}
+
+void parseshortarg(char *arg) {
+  size_t i = 1;
+  while (arg[i] != '\0') {
+    char c = arg[i];
+    switch (c) {
+    case 'c':
+      conf.color = !conf.color;
+      break;
+    case 'n':
+      conf.lines = !conf.lines;
+      break;
+    default:
+      argerr("unrecognized flag", &c);
+      break;
+    }
+    i++;
+  }
+}
+
+int parseargs(int argc, char *argv[]) {
+  int i;
+  for (i = 1; i < argc; i++) { // offset for argv[0]
+    char *arg = argv[i];
+
+    if (arg[0] == '-') {
+      if (arg[1] == '-') {
+        parselongarg(arg);
+        continue;
+      }
+
+      parseshortarg(arg);
+    } else {
+      return i;
+    }
+  }
+
+  return i;
+}