feat(hectic C): json api

package/c/hmpl/main.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "chectic.h"
+#include "cjson/cJSON.h"
+#include "hmpl.h"
+
+int main(int argc, char *argv[]) {
+  init_logger();
+  raise_info("start");
+
+  Arena arena = arena_init(1024 * 1024);
+  Arena arena_for_jsons = arena_init(1024 * 1024);
+  init_cjson_with_arenas(&arena_for_jsons);
+
+  raise_info("read the arguments");
+  char *text = NULL;
+
+  const char *json_input = (argc > 1 ? argv[1] : "{}");
+  cJSON *context = cJSON_Parse(json_input);
+
+  if (!context) {
+      fprintf(stderr, "Error parsing JSON\n");
+      return 1;
+  }
+
+  if (argc > 2) {
+    text = arena_strdup(&arena, argv[2]);
+  } else if (!isatty(fileno(stdin))) {
+    size_t size = 0;
+    char *heap_text = NULL;
+    ssize_t len = getdelim(&heap_text, &size, '\0', stdin);
+    if (len < 0) {
+      perror("read stdin");
+      cJSON_Delete(context);
+      return 1;
+    }
+    text = arena_strdup(&arena, heap_text);
+    free(heap_text);  // free temporary heap allocation
+  } else {
+    text = arena_strdup(&arena, "");
+  }
+
+  render_template_with_arena(&arena, &text, context);
+  printf("%s", text);
+
+  arena_free(&arena);
+  cJSON_Delete(context);
+  return 0;
+}