Implement actual arg parsing

calathea.c

@@ -5,6 +5,7 @@
 #include <dirent.h>
 #include <math.h>
 #include <ctype.h>
+#include <argp.h>
 #include <cmark.h>
 
 // Structure defining the content and metadata of a single page
@@ -217,40 +218,43 @@ char * substitute_string(char dest[], char sub[], char *start, char *end) {
   return compiled;
 }
 
-int main(int argc, char *argv[]) {
-  char pagesLocation[256] = "./pages";
-  int initialInboundCapacity = 2;
-  char templateFileName[256] = "./template.html";
-  char outputDirectoryName[256] = "./build";
+static struct argp_option options[] = {
+  { "src", 's', "dir", 0, "Source directory of pages", 0 },
+  { "template", 't', "file", 0, "Template file path", 0 },
+  { "output", 'o', "dir", 0, "Output directory", 0 },
+  { 0 }
+};
 
-  /*** Argument Parsing ***/
-  for (int i = 1; i < argc; i++) {
-    if (strcmp(argv[i], "--pages") == 0) {
-      // We only want to do this if a directory was actually supplied
-      if (i + 1 < argc) {
-        i++;
-        strcpy(pagesLocation, argv[i]);
-      }
-    } else if (strcmp(argv[i], "--template") == 0) {
-      if (i + 1 < argc) {
-        i++;
-        strcpy(templateFileName, argv[i]);
-      }
-    } else if (strcmp(argv[i], "--output-dir") == 0) {
-      if (i + 1 < argc) {
-        i++;
-        strcpy(outputDirectoryName, argv[i]);
-      }
-    } else if (strcmp(argv[i], "--incoming-cap") == 0) {
-      if (i + 1 < argc) {
-        i++;
-        initialInboundCapacity = atoi(argv[i]);
-      }
-    } else {
-      printf("Unknown argument: %s\n", argv[i]);
+static char *pagesLocation = "./pages";
+static char *templateFileName = "./template.html";
+static char *outputDirectoryName = "./build";
+
+static int parse_opt(int key, char *arg, struct argp_state *state) {
+  switch (key) {
+    case 's': {
+      pagesLocation = arg;
+      break;
+    }
+    case 't': {
+      templateFileName = arg;
+      break;
+    }
+    case 'o': {
+      outputDirectoryName = arg;
+      break;
     }
   }
 
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  int initialInboundCapacity = 2;
+
+  struct argp argp = {options, parse_opt, 0, 0 };
+
+  argp_parse(&argp, argc, argv, 0, 0, 0);
+
   char *templateContent = read_file(templateFileName);
 
   if (templateContent == NULL) {