Implement pretty-printing option in Json.

Telodendria itself doesn't use it, but the json CLI tool does.

TODO.txt

@@ -20,15 +20,17 @@ Milestone: v0.3.0
     [ ] HttpClient man page
     [ ] Uri man page
     [ ] Test on other platforms
-[ ] Option to pretty-print Json
+[~] Option to pretty-print Json
+    [ ] Document JsonEncode() and JsonEncodeValue()
+[ ] Update man page for td
 
 [~] Simple command line tool to make matrix requests
     [x] Built on HTTP client API
     [ ] http man page
 [~] Simple command line tool for working with JSON
-    - Like a simpler version of jq
+    [x] Should pretty-print Json
-    - Should pretty-print Json
+    [ ] Query fields for use in shell scripts.
-    - Should be able to query fields for use in shell scripts.
+    [ ] json man page
 
 [ ] Move configuration to database
     [ ] Initial configuration

src/CanonicalJson.c

@@ -74,7 +74,7 @@ CanonicalJsonEncodeValue(JsonValue * value, FILE * out)
             fputc(']', out);
             break;
         default:
-            JsonEncodeValue(value, out);
+            JsonEncodeValue(value, out, JSON_DEFAULT);
             break;
     }
 }

src/Db.c

@@ -752,7 +752,7 @@ DbUnlock(Db * db, DbRef * ref)
         return 0;
     }
 
-    JsonEncode(ref->json, ref->fp);
+    JsonEncode(ref->json, ref->fp, JSON_DEFAULT);
 
     fflush(ref->fp);
     fclose(ref->fp);

src/Json.c

@@ -561,7 +561,7 @@ JsonDecodeString(FILE * in)
 }
 
 void
-JsonEncodeValue(JsonValue * value, FILE * out)
+JsonEncodeValue(JsonValue * value, FILE * out, int level)
 {
     size_t i;
     size_t len;
@@ -570,23 +570,30 @@ JsonEncodeValue(JsonValue * value, FILE * out)
     switch (value->type)
     {
         case JSON_OBJECT:
-            JsonEncode(value->as.object, out);
+            JsonEncode(value->as.object, out, level >= 0 ? level : level);
             break;
         case JSON_ARRAY:
             arr = value->as.array;
             len = ArraySize(arr);
 
             fputc('[', out);
-
             for (i = 0; i < len; i++)
             {
-                JsonEncodeValue(ArrayGet(arr, i), out);
+                if (level >= 0)
+                {
+                    fprintf(out, "\n%*s", level + 2, "");
+                }
+                JsonEncodeValue(ArrayGet(arr, i), out, level >= 0 ? level + 2 : level);
                 if (i < len - 1)
                 {
                     fputc(',', out);
                 }
             }
 
+            if (level >= 0)
+            {
+                fprintf(out, "\n%*s", level, "");
+            }
             fputc(']', out);
             break;
         case JSON_STRING:
@@ -617,7 +624,7 @@ JsonEncodeValue(JsonValue * value, FILE * out)
 }
 
 int
-JsonEncode(HashMap * object, FILE * out)
+JsonEncode(HashMap * object, FILE * out, int level)
 {
     size_t index;
     size_t count;
@@ -636,22 +643,46 @@ JsonEncode(HashMap * object, FILE * out)
     }
 
     fputc('{', out);
+    if (level >= 0)
+    {
+        fputc('\n', out);
+    }
 
     index = 0;
     while (HashMapIterate(object, &key, (void **) &value))
     {
+        if (level >= 0)
+        {
+            fprintf(out, "%*s", level + 2, "");
+        }
+
         JsonEncodeString(key, out);
+
         fputc(':', out);
-        JsonEncodeValue(value, out);
+        if (level >= 0)
+        {
+            fputc(' ', out);
+        }
+
+        JsonEncodeValue(value, out, level >= 0 ? level + 2 : level);
 
         if (index < count - 1)
         {
             fputc(',', out);
         }
 
+        if (level >= 0)
+        {
+            fputc('\n', out);
+        }
+
         index++;
     }
 
+    if (level >= 0)
+    {
+        fprintf(out, "%*s", level, "");
+    }
     fputc('}', out);
 
     return 1;

src/Matrix.c

@@ -130,7 +130,7 @@ MatrixHttpHandler(HttpServerContext * context, void *argp)
 
         stream = HttpStream(context);
 
-        JsonEncode(response, stream);
+        JsonEncode(response, stream, JSON_DEFAULT);
         JsonFree(response);
 
         fprintf(stream, "\n");

src/include/Json.h

@@ -31,6 +31,9 @@
 #include <stdio.h>
 #include <stddef.h>
 
+#define JSON_DEFAULT -1
+#define JSON_PRETTY 0
+
 typedef enum JsonType
 {
     JSON_NULL,
@@ -96,10 +99,10 @@ extern void
  JsonEncodeString(const char *, FILE *);
 
 extern void
- JsonEncodeValue(JsonValue * value, FILE * out);
+ JsonEncodeValue(JsonValue * value, FILE * out, int);
 
 extern int
- JsonEncode(HashMap *, FILE *);
+ JsonEncode(HashMap *, FILE *, int);
 
 extern HashMap *
  JsonDecode(FILE *);

tools/src/json.c

@@ -38,7 +38,7 @@ main(int argc, char **argv)
         return 1;
     }
 
-    JsonEncode(json, stdout);
+    JsonEncode(json, stdout, JSON_PRETTY);
     printf("\n");
 
     return 0;