From: Michael Buch
Adding a new keymap component that will
indicate the current keyboard layout (language)
and variant if any was set. I use the
standard X11 XKB APIs to retrieve and parse
the xkb_symbols set with setxkbmap.
---
Makefile| 2 +-
components/keymap.c | 96 +
config.def.h| 2 +
slstatus.h | 6 +--
4 files changed, 102 insertions(+), 4 deletions(-)
create mode 100644 components/keymap.c
diff --git a/Makefile b/Makefile
index 8e18969..c7b9d0c 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,6 @@ include config.mk
REQ = util
COM =\
- components/backlight\
components/battery\
components/cpu\
components/datetime\
@@ -15,6 +14,7 @@ COM =\
components/hostname\
components/ip\
components/kernel_release\
+ components/keymap\
components/keyboard_indicators\
components/load_avg\
components/netspeeds\
diff --git a/components/keymap.c b/components/keymap.c
new file mode 100644
index 000..67d605e
--- /dev/null
+++ b/components/keymap.c
@@ -0,0 +1,96 @@
+/* See LICENSE file for copyright and license details. */
+#include
+#include
+#include
+#include
+
+#include "../util.h"
+
+#define LAYOUT_MAX 256
+
+/* Given a token (sym) from the xkb_symbols string
+ * check whether it is a valid layout/variant. The
+ * EXCLUDES array contains invalid layouts/variants
+ * that are part of the xkb rules config.
+ */
+int
+IsLayoutOrVariant(char *sym)
+{
+ static const char* EXCLUDES[] = { "evdev", "inet", "pc", "base" };
+
+ size_t i;
+ for (i = 0; i < sizeof(EXCLUDES)/sizeof(EXCLUDES[0]); ++i)
+ if (strstr(sym, EXCLUDES[i]))
+ return 0;
+
+ return 1;
+}
+
+/* Given a xkb_symbols string (syms) retrieve
+ * and populate the provided layout and variant
+ * strings
+ */
+void
+GetKeyLayout(char *syms, char layout[], int groupNum)
+{
+ char *token,
+*copy,
+*delims = "+:";
+ int group = 0;
+
+ copy = strdup(syms);
+ token = strtok(copy, delims);
+ while (token != NULL && group <= groupNum) {
+ /* Ignore :2,:3,:4 which represent additional layout
+* groups
+*/
+ if (IsLayoutOrVariant(token)
+ && !(strlen(token) == 1 && isdigit(token[0]))) {
+ strncpy (layout, token, LAYOUT_MAX);
+ group++;
+ }
+
+ token = strtok(NULL,delims);
+ }
+}
+
+const char *
+keymap(void)
+{
+ static char layout[LAYOUT_MAX];
+
+ Display *dpy;
+ char *symbols = NULL;
+ XkbDescRec* desc = NULL;
+
+ memset(layout, '\0', LAYOUT_MAX);
+
+ if (!(dpy = XOpenDisplay(NULL))) {
+ warn("XOpenDisplay: Failed to open display");
+ return NULL;
+ }
+
+ desc = XkbAllocKeyboard();
+ if (!desc) {
+ warn("XkbGetNames: failed to get XkbSymbolsNameMask keyboard
component");
+ XCloseDisplay(dpy);
+ return NULL;
+ }
+
+ XkbGetNames(dpy, XkbSymbolsNameMask, desc);
+ if (desc->names) {
+ XkbStateRec state;
+ XkbGetState(dpy, XkbUseCoreKbd, &state);
+
+ symbols = XGetAtomName(dpy, desc->names->symbols);
+ GetKeyLayout(symbols, layout, state.group);
+ XFree(symbols);
+ } else {
+ warn("XkbGetNames: failed to retrieve symbols for keys");
+ return NULL;
+ }
+
+ XkbFreeKeyboard(desc, XkbSymbolsNameMask, 1);
+ XCloseDisplay(dpy);
+ return layout;
+}
diff --git a/config.def.h b/config.def.h
index 45320a3..33da6a4 100644
--- a/config.def.h
+++ b/config.def.h
@@ -34,6 +34,8 @@ static const char unknown_str[] = "n/a";
* ipv6 IPv6 addressinterface name (eth0)
* kernel_release `uname -r` NULL
* keyboard_indicators caps/num lock indicatorsNULL
+ * keymap layout (variant) of current NULL
+ * keyboard
* load_avg load averageNULL
* netspeed_rx receive network speed interface name (wlan0)
* netspeed_tx transfer network speed interface name (wlan0)
diff --git a/slstatus.h b/slstatus.h
index a18b881..079a8db 100644
--- a/slstatus.h
+++ b/slstatus.h
@@ -1,8 +1,5 @@
/* See LICENSE file for copyright and license details. */
-/* backlight */
-const char *backlight_perc(const char *);
-
/* battery */
const char *battery_perc(const char *);
const char *battery_state(const char *);
@@ -37,6 +34,9 @@ const char *kernel_release(void);
/* keyboard_indicators */
const char *keyboard_indicators(void);
+/* keymap */
+const char *keymap(void);
+
/* load_avg */
const char *load_avg(const c
