add yajl compat code

Author: stapelberg

Makefile

@@ -35,6 +35,10 @@ endif
 
 CFLAGS+=$(EXTRA_CFLAGS)
 
+# Fallback for libyajl 1 which did not include yajl_version.h. We need
+# YAJL_MAJOR from that file to decide which code path should be used.
+CFLAGS += -idirafter $(TOPDIR)/yajl-fallback
+
 OBJS:=$(wildcard src/*.c *.c)
 OBJS:=$(OBJS:.c=.o)
 

i3status.c

@@ -29,6 +29,7 @@
 #include <locale.h>
 
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 
@@ -346,7 +347,11 @@ int main(int argc, char *argv[]) {
                         || !valid_color(cfg_getstr(cfg_general, "color_separator")))
                die("Bad color format");
 
+#if YAJL_MAJOR >= 2
         yajl_gen json_gen = yajl_gen_alloc(NULL);
+#else
+        yajl_gen json_gen = yajl_gen_alloc(NULL, NULL);
+#endif
 
         if (output_format == O_I3BAR) {
                 /* Initialize the i3bar protocol. See i3/docs/i3bar-protocol
@@ -466,7 +471,11 @@ int main(int argc, char *argv[]) {
                 if (output_format == O_I3BAR) {
                         yajl_gen_array_close(json_gen);
                         const unsigned char *buf;
+#if YAJL_MAJOR >= 2
                         size_t len;
+#else
+                        unsigned int len;
+#endif
                         yajl_gen_get_buf(json_gen, &buf, &len);
                         write(STDOUT_FILENO, buf, len);
                         yajl_gen_clear(json_gen);

include/i3status.h

@@ -7,6 +7,7 @@ enum { O_DZEN2, O_XMOBAR, O_I3BAR, O_NONE } output_format;
 #include <confuse.h>
 #include <time.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 #include <unistd.h>
 #include <string.h>
 

src/print_battery_info.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 

src/print_cpu_temperature.c

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 

src/print_cpu_usage.c

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #ifdef __FreeBSD__
 #include <sys/types.h>

src/print_ddate.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 

src/print_disk_info.c

@@ -11,6 +11,7 @@
 #include <sys/mount.h>
 #endif
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 

src/print_eth_info.c

@@ -8,6 +8,8 @@
 #include <net/if.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"
 

src/print_ipv6_addr.c

@@ -9,6 +9,7 @@
 #include <string.h>
 #include <arpa/inet.h>
 #include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
 
 #include "i3status.h"