mkRandGeo.c in h3-3.5.0

- old
+ new
@@ -15,49 +15,54 @@
  */
 /** @file
  * @brief generates random lat/lon pairs and bins them at the specified
  * resolution
  *
- *  usage: `mkRandGeo numPoints resolution`
+ *  See `mkRandGeo --help` for usage.
  *
  *  The program generates `numPoints` random lat/lon coordinates and outputs
  *  them along with the corresponding H3Index at the specified `resolution`.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
-#include "baseCells.h"
-#include "h3Index.h"
+#include "args.h"
 #include "utility.h"
 
-void randomGeo(GeoCoord* g) {
-    static int init = 0;
-    if (!init) {
-        srand((unsigned int)time(0));
-        init = 1;
-    }
-
-    g->lat = H3_EXPORT(degsToRads)(
-        (((float)rand() / (float)(RAND_MAX)) * 180.0) - 90.0);
-    g->lon = H3_EXPORT(degsToRads)((float)rand() / (float)(RAND_MAX)) * 360.0;
-}
-
 int main(int argc, char* argv[]) {
-    // check command line args
-    if (argc > 3) {
-        fprintf(stderr, "usage: %s numPoints resolution\n", argv[0]);
-        exit(1);
-    }
-
+    int res = 0;
     int numPoints = 0;
-    if (!sscanf(argv[1], "%d", &numPoints))
-        error("numPoints must be an integer");
 
-    int res = 0;
-    if (!sscanf(argv[2], "%d", &res)) error("resolution must be an integer");
+    Arg helpArg = ARG_HELP;
+    Arg numPointsArg = {
+        .names = {"-n", "--num-points"},
+        .required = true,
+        .scanFormat = "%d",
+        .valueName = "num",
+        .value = &numPoints,
+        .helpText = "Number of random lat/lon pairs to generate."};
+    Arg resArg = {.names = {"-r", "--resolution"},
+                  .required = true,
+                  .scanFormat = "%d",
+                  .valueName = "res",
+                  .value = &res,
+                  .helpText = "Resolution, 0-15 inclusive."};
 
-    if (res > MAX_H3_RES) error("specified resolution exceeds max resolution");
+    Arg* args[] = {&helpArg, &numPointsArg, &resArg};
+    const int numArgs = 3;
+    const char* helpText =
+        "Generates random lat/lon pairs and indexes them at the specified "
+        "resolution.";
+
+    if (parseArgs(argc, argv, numArgs, args, &helpArg, helpText)) {
+        return helpArg.found ? 0 : 1;
+    }
+
+    if (res > MAX_H3_RES) {
+        printHelp(stderr, argv[0], helpText, numArgs, args,
+                  "Resolution exceeds maximum resolution.", NULL);
+        return 1;
+    }
 
     for (int i = 0; i < numPoints; i++) {
         GeoCoord g;
         randomGeo(&g);
 