Add keyboard led indicator.

Makefile.am

@@ -30,6 +30,8 @@ AM_CPPFLAGS = \
 i3status_CFLAGS = \
 	$(AM_CFLAGS) \
 	$(CONFUSE_CFLAGS) \
+	$(X11_CFLAGS) \
+	$(XKBFILE_CFLAGS) \
 	$(YAJL_CFLAGS) \
 	$(PULSE_CFLAGS) \
 	$(NLGENL_CFLAGS) \
@@ -42,6 +44,8 @@ i3status_CPPFLAGS = \
 
 i3status_LDADD = \
 	$(CONFUSE_LIBS) \
+	$(X11_LIBS) \
+	$(XKBFILE_CFLAGS) \
 	$(YAJL_LIBS) \
 	$(PULSE_LIBS) \
 	$(NLGENL_LIBS) \
@@ -73,6 +77,7 @@ i3status_SOURCES = \
 	src/print_volume.c \
 	src/print_wireless_info.c \
 	src/print_file_contents.c \
+	src/print_keyboard_status.c \
 	src/process_runs.c
 
 if PULSE

configure.ac

@@ -78,6 +78,8 @@ AC_SEARCH_LIBS([shm_open], [rt])
 AC_CANONICAL_HOST
 
 PKG_CHECK_MODULES([CONFUSE], [libconfuse])
+PKG_CHECK_MODULES([X11], [x11])
+PKG_CHECK_MODULES([XKBFILE], [xkbfile])
 PKG_CHECK_MODULES([YAJL], [yajl])
 
 AC_ARG_ENABLE(pulseaudio,

i3status.c

@@ -258,6 +258,15 @@ int main(int argc, char *argv[]) {
         CFG_STR("markup", "none", CFGF_NONE),
         CFG_END()};
 
+    cfg_opt_t keyboard_opts[] = {
+        CFG_STR("format", "%C,%N", CFGF_NONE),
+        CFG_CUSTOM_ALIGN_OPT,
+        CFG_CUSTOM_COLOR_OPTS,
+        CFG_CUSTOM_MIN_WIDTH_OPT,
+        CFG_CUSTOM_SEPARATOR_OPT,
+        CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
+        CFG_END()};
+
     cfg_opt_t run_watch_opts[] = {
         CFG_STR("pidfile", NULL, CFGF_NONE),
         CFG_STR("format", "%title: %status", CFGF_NONE),
@@ -473,6 +482,7 @@ int main(int argc, char *argv[]) {
         CFG_SEC("memory", memory_opts, CFGF_NONE),
         CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
         CFG_SEC("read_file", read_opts, CFGF_TITLE | CFGF_MULTI),
+        CFG_SEC("keyboard_status", keyboard_opts, CFGF_NONE),
         CFG_END()};
 
     char *configfile = NULL;
@@ -673,6 +683,12 @@ int main(int argc, char *argv[]) {
                 SEC_CLOSE_MAP;
             }
 
+            CASE_SEC("keyboard_status") {
+                SEC_OPEN_MAP("keyboard_status");
+                print_keyboard_status(json_gen, buffer, cfg_getstr(sec, "format"));
+                SEC_CLOSE_MAP;
+            }
+
             CASE_SEC_TITLE("wireless") {
                 SEC_OPEN_MAP("wireless");
                 const char *interface = NULL;

i3status.conf

@@ -12,6 +12,7 @@ general {
 }
 
 order += "ipv6"
+order += "keyboard_status"
 order += "wireless _first_"
 order += "ethernet _first_"
 order += "battery all"
@@ -51,3 +52,7 @@ memory {
 tztime local {
         format = "%Y-%m-%d %H:%M:%S"
 }
+
+keyboard_status {
+  format = "CAPS:%C NUM:%N"
+}

include/i3status.h

@@ -192,6 +192,7 @@ char *resolve_tilde(const char *path);
 void *scalloc(size_t size);
 char *sstrdup(const char *str);
 
+void print_keyboard_status(yajl_gen json_gen, char *buffer, const char *format);
 /* src/output.c */
 void print_separator(const char *separator);
 char *color(const char *colorstr);

src/print_keyboard_status.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <X11/XKBlib.h>
+#include <X11/extensions/XKBrules.h>
+
+#include "i3status.h"
+
+#define STRING_SIZE 20
+
+void print_keyboard_status(yajl_gen json_gen, char *buffer, const char *format) {
+
+  char *outwalk = buffer;
+  char caps_lock = 0;
+  char num_lock = 0;
+  char string_caps_lock[STRING_SIZE];
+  char string_num_lock[STRING_SIZE];
+
+  Display *display = XOpenDisplay(getenv("DISPLAY"));
+  XKeyboardState keyboard_state;
+  XGetKeyboardControl(display, &keyboard_state);
+
+  if (display) {
+    caps_lock = keyboard_state.led_mask & 0x1;
+    num_lock = keyboard_state.led_mask & 0x2;
+    XCloseDisplay(display);
+  }
+
+  snprintf(string_caps_lock, STRING_SIZE, "%s", caps_lock ? "ON" : "OFF");
+  snprintf(string_num_lock, STRING_SIZE, "%s", num_lock ? "ON" : "OFF");
+
+  placeholder_t placeholders[] = {
+    {.name = "%C", .value = string_caps_lock},
+    {.name = "%N", .value = string_num_lock}};
+
+  const size_t num = sizeof(placeholders) / sizeof(placeholder_t);
+  buffer = format_placeholders(format, &placeholders[0], num);
+  OUTPUT_FULL_TEXT(buffer);
+  free(buffer);
+}