i3 - improved tiling WM

commands.c yajl macros allow NULL

Patch status: needinfo

Patch by Tony Crisci

To apply this patch, use:
curl http://cr.i3wm.org/patch/552/raw.patch | git am

b/src/commands.c

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@@ -16,21 +16,25 @@
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 #include "shmlog.h"
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 // Macros to make the YAJL API a bit easier to use.
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-#define y(x, ...) yajl_gen_ ## x (cmd_output->json_gen, ##__VA_ARGS__)
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-#define ystr(str) yajl_gen_string(cmd_output->json_gen, (unsigned char*)str, strlen(str))
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+#define y(x, ...) (cmd_output != NULL ? yajl_gen_ ## x (cmd_output->json_gen, ##__VA_ARGS__) : 0)
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+#define ystr(str) (cmd_output != NULL ? yajl_gen_string(cmd_output->json_gen, (unsigned char*)str, strlen(str)) : 0)
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 #define ysuccess(success) do { \
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-    y(map_open); \
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-    ystr("success"); \
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-    y(bool, success); \
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-    y(map_close); \
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+    if (cmd_output->json_gen != NULL) { \
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+        y(map_open); \
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+        ystr("success"); \
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+        y(bool, success); \
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+        y(map_close); \
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+    } \
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 } while (0)
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 #define yerror(message) do { \
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-    y(map_open); \
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-    ystr("success"); \
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-    y(bool, false); \
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-    ystr("error"); \
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-    ystr(message); \
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-    y(map_close); \
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+    if (cmd_output->json_gen != NULL) { \
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+        y(map_open); \
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+        ystr("success"); \
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+        y(bool, false); \
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+        ystr("error"); \
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+        ystr(message); \
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+        y(map_close); \
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+    } \
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 } while (0)
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 /** When the command did not include match criteria (!), we use the currently