List generic pressed modifiers on failure

i3lock.c

@@ -59,8 +59,7 @@ static bool beep = false;
 bool debug_mode = false;
 static bool dpms = false;
 bool unlock_indicator = true;
-bool capslock_active = false;
-bool numlock_active = false;
+char *modifier_string = NULL;
 static bool dont_fork = false;
 struct ev_loop *main_loop;
 static struct ev_timer *clear_pam_wrong_timeout;
@@ -219,6 +218,12 @@ static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {
     unlock_state = STATE_STARTED;
     redraw_screen();
 
+    /* Clear modifier string. */
+    if (modifier_string != NULL) {
+        free(modifier_string);
+        modifier_string = NULL;
+    }
+
     /* Now free this timeout. */
     STOP_TIMER(clear_pam_wrong_timeout);
 }
@@ -281,8 +286,38 @@ static void input_done(void) {
 
     /* Get state of Caps and Num lock modifiers, to be displayed in
      * STATE_PAM_WRONG state */
-    capslock_active = xkb_state_mod_name_is_active(xkb_state, XKB_MOD_NAME_CAPS, XKB_STATE_MODS_EFFECTIVE);
-    numlock_active = xkb_state_mod_name_is_active(xkb_state, XKB_MOD_NAME_NUM, XKB_STATE_MODS_EFFECTIVE);
+    xkb_mod_index_t idx, num_mods;
+    const char *mod_name;
+
+    num_mods = xkb_keymap_num_mods(xkb_keymap);
+
+    for (idx = 0; idx < num_mods; idx++) {
+        if (!xkb_state_mod_index_is_active(xkb_state, idx, XKB_STATE_MODS_EFFECTIVE))
+            continue;
+
+        mod_name = xkb_keymap_mod_get_name(xkb_keymap, idx);
+        if (mod_name == NULL)
+            continue;
+
+        /* Replace certain xkb names with nicer, human-readable ones. */
+        if (strcmp(mod_name, XKB_MOD_NAME_CAPS) == 0)
+            mod_name = "Caps Lock";
+        else if (strcmp(mod_name, XKB_MOD_NAME_ALT) == 0)
+            mod_name = "Alt";
+        else if (strcmp(mod_name, XKB_MOD_NAME_NUM) == 0)
+            mod_name = "Num Lock";
+        else if (strcmp(mod_name, XKB_MOD_NAME_LOGO) == 0)
+            mod_name = "Win";
+
+        char *tmp;
+        if (modifier_string == NULL) {
+            if (asprintf(&tmp, "%s", mod_name) != -1)
+                modifier_string = tmp;
+        } else if (asprintf(&tmp, "%s, %s", modifier_string, mod_name) != -1) {
+            free(modifier_string);
+            modifier_string = tmp;
+        }
+    }
 
     pam_state = STATE_PAM_WRONG;
     failed_attempts += 1;

unlock_indicator.c

@@ -45,9 +45,8 @@ extern uint32_t last_resolution[2];
 /* Whether the unlock indicator is enabled (defaults to true). */
 extern bool unlock_indicator;
 
-/* Whether the capslock and numlock mods are active or not. */
-extern bool capslock_active;
-extern bool numlock_active;
+/* List of pressed modifiers, or NULL if none are pressed. */
+extern char *modifier_string;
 
 /* A Cairo surface containing the specified image (-i), if any. */
 extern cairo_surface_t *img;
@@ -234,27 +233,19 @@ xcb_pixmap_t draw_image(uint32_t *resolution) {
             cairo_close_path(ctx);
         }
 
-        if (pam_state == STATE_PAM_WRONG && (capslock_active || numlock_active)) {
+        if (pam_state == STATE_PAM_WRONG && (modifier_string != NULL)) {
             cairo_text_extents_t extents;
             double x, y;
-            char *lock_text = NULL;
 
-            if (asprintf(&lock_text, "%s%s%s locked",
-                        capslock_active ? "Caps" : "",
-                        capslock_active && numlock_active ? ", " : "",
-                        numlock_active ? "Num" : "") != -1) {
-                cairo_set_font_size(ctx, 14.0);
+            cairo_set_font_size(ctx, 14.0);
 
-                cairo_text_extents(ctx, lock_text, &extents);
-                x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
-                y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing) + 28.0;
-
-                cairo_move_to(ctx, x, y);
-                cairo_show_text(ctx, lock_text);
-                cairo_close_path(ctx);
+            cairo_text_extents(ctx, modifier_string, &extents);
+            x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
+            y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing) + 28.0;
 
-                free(lock_text);
-            }
+            cairo_move_to(ctx, x, y);
+            cairo_show_text(ctx, modifier_string);
+            cairo_close_path(ctx);
         }
 
         /* After the user pressed any valid key or the backspace key, we