Adding key_indicator that shows the status of 'Caps Lock', 'Num Lock'

and 'Scroll Lock' in i3status output.

.gitignore

@@ -8,3 +8,5 @@ man/i3status.1
 # it is up to you to arrange for it to be ignored by git,
 # e.g. by listing your directory in .git/info/exclude.
 /build
+
+.vscode

i3status.c

@@ -443,6 +443,18 @@ int main(int argc, char *argv[]) {
         CFG_CUSTOM_SEP_BLOCK_WIDTH_OPT,
         CFG_END()};
 
+    cfg_opt_t key_indicator_opts[] = {
+        CFG_STR("format", "%content", CFGF_NONE),
+        CFG_STR("format_bad", "%title - %errno: %error", CFGF_NONE),
+        CFG_STR("path", NULL, CFGF_NONE),
+        CFG_INT("max_characters", 255, 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 read_opts[] = {
         CFG_STR("format", "%content", CFGF_NONE),
         CFG_STR("format_bad", "%title - %errno: %error", CFGF_NONE),
@@ -473,6 +485,7 @@ int main(int argc, char *argv[]) {
         CFG_SEC("load", load_opts, CFGF_NONE),
         CFG_SEC("memory", memory_opts, CFGF_NONE),
         CFG_SEC("cpu_usage", usage_opts, CFGF_NONE),
+        CFG_SEC("key_indicator", key_indicator_opts, CFGF_NONE),
         CFG_SEC("read_file", read_opts, CFGF_TITLE | CFGF_MULTI),
         CFG_END()};
 
@@ -932,6 +945,17 @@ int main(int argc, char *argv[]) {
                 SEC_CLOSE_MAP;
             }
 
+			CASE_SEC("key_indicator") {
+                SEC_OPEN_MAP("key_indicator");
+                key_indicator_ctx_t ctx = {
+                    .json_gen = json_gen,
+                    .buf = buffer,
+					.buflen = sizeof(buffer),
+                };
+                print_key_indicator(&ctx);
+                SEC_CLOSE_MAP;
+            }
+
             CASE_SEC_TITLE("read_file") {
                 SEC_OPEN_MAP("read_file");
                 file_contents_ctx_t ctx = {

include/i3status.h

@@ -424,6 +424,14 @@ typedef struct {
 
 void print_volume(volume_ctx_t *ctx);
 
+typedef struct {
+    yajl_gen json_gen;
+    char *buf;
+	const size_t buflen;
+} key_indicator_ctx_t;
+
+void print_key_indicator(key_indicator_ctx_t *ctx);
+
 bool process_runs(const char *path);
 int volume_pulseaudio(uint32_t sink_idx, const char *sink_name);
 bool description_pulseaudio(uint32_t sink_idx, const char *sink_name, char buffer[MAX_SINK_DESCRIPTION_LEN]);

meson.build

@@ -144,6 +144,7 @@ add_project_arguments('-D_GNU_SOURCE', language: 'c')
 # https://mesonbuild.com/howtox.html#add-math-library-lm-portably
 m_dep = cc.find_library('m', required: false)
 rt_dep = cc.find_library('rt', required: false)
+x_dep = cc.find_library('X11', required: true)
 
 confuse_dep = dependency('libconfuse', method: 'pkg-config')
 yajl_dep = dependency('yajl', method: 'pkg-config')
@@ -170,8 +171,10 @@ i3status_srcs = [
   'src/print_time.c',
   'src/print_volume.c',
   'src/print_wireless_info.c',
+  'src/print_key_indicator.c',
   'src/print_file_contents.c',
   'src/process_runs.c',
+  'src/print_key_indicator.c',
 ]
 
 thread_dep = dependency('threads')
@@ -180,6 +183,7 @@ i3status_deps = [
   thread_dep,
   m_dep,
   rt_dep,
+  x_dep,
   confuse_dep,
   yajl_dep,
   config_h,
@@ -202,7 +206,7 @@ if host_os == 'netbsd'
   i3status_deps += [prop_dep]
 endif
 
-inc = include_directories('include')
+inc = include_directories('include', '/usr/include/')
 
 executable(
   'i3status',

src/print_key_indicator.c

@@ -0,0 +1,46 @@
+
+#include <stdlib.h>
+
+#include <yajl/yajl_gen.h>
+#include <yajl/yajl_version.h>
+
+#include <X11/extensions/XKB.h>
+#include <X11/XKBlib.h>
+
+#include "i3status.h"
+
+#define NUM_INDS 3
+#define STRING_SIZE 6
+
+void print_key_indicator(key_indicator_ctx_t *ctx) {
+	
+	char *outwalk = ctx->buf;
+	char *ind_names[NUM_INDS] = {"Num Lock", "Caps Lock", "Scroll Lock"};
+	char indicator_string[STRING_SIZE];
+	char indicator_chars[3];
+	int i;
+	int ndx = 0;
+		
+	Atom iatoms[NUM_INDS] = {0};
+	Bool state[NUM_INDS] = {0};
+
+	Display *dpy = XOpenDisplay(NULL); 
+
+	for (i = 0; i < NUM_INDS; i++) {
+		iatoms[i] = XInternAtom(dpy, ind_names[i], 0);
+	}
+		
+	for (i = 0; i < NUM_INDS; i++) {
+		XkbGetNamedIndicator(dpy, iatoms[i], &ndx, &state[i], NULL, NULL);
+	}
+
+	indicator_chars[0] = state[0] ? 'N' : 'n';
+	indicator_chars[1] = state[1] ? 'C' : 'c';
+	indicator_chars[2] = state[2] ? 'S' : 's';
+
+	snprintf(indicator_string, STRING_SIZE, "%c %c %c", indicator_chars[0], indicator_chars[1], indicator_chars[2]);
+
+	OUTPUT_FULL_TEXT(indicator_string);
+
+	XCloseDisplay(dpy);
+}