Discard MSC_SCAN events

Given that only EV_KEY events are being mapped, without their scancode
counterparts, we just drop all scancode events to avoid having to map
them too, to syncing it with the corresponding mapped keys. This is
expected to be harmless.

README.md

@@ -4,9 +4,7 @@ _Transforming the most useless key **ever** in the most useful one._
 <sub>_For vi/Vim/NeoVim addicts at least_.</sub>
 
 <a href="http://www.catonmat.net/blog/why-vim-uses-hjkl-as-arrow-keys/">
-
-![ADM-3A terminal](http://www.catonmat.net/images/why-vim-uses-hjkl/lsi-adm3a-full-keyboard.jpg)
-
+    <img src="http://www.catonmat.net/images/why-vim-uses-hjkl/lsi-adm3a-full-keyboard.jpg" alt="ADM-3A terminal">
 </a>
 
 ## What is it?
@@ -28,8 +26,8 @@ ESC when pressed alone is quite handy, specially in vi.
 ## Building
 
 ```
-$ git clone git@gitlab.com:interception/linux/tools.git
-$ cd tools
+$ git clone git@gitlab.com:interception/linux/plugins/caps2esc.git
+$ cd caps2esc
 $ mkdir build
 $ cd build
 $ cmake ..
@@ -58,6 +56,12 @@ I'm maintaining an Archlinux package on AUR:
 
 - <https://aur.archlinux.org/packages/interception-caps2esc>
 
+I don't use Ubuntu and recommend Archlinux instead, as it provides the AUR, so I
+don't maintain PPAs. For more information on Ubuntu/Debian installation check
+this:
+
+- <https://askubuntu.com/questions/979359/how-do-i-install-caps2esc>
+
 ## Caveats
 
 As always, there's always a caveat:

caps2esc.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <unistd.h>
 #include <linux/input.h>
 
 // clang-format off
@@ -13,7 +14,8 @@ ctrl_down       = {.type = EV_KEY, .code = KEY_LEFTCTRL, .value = 1},
 capslock_down   = {.type = EV_KEY, .code = KEY_CAPSLOCK, .value = 1},
 esc_repeat      = {.type = EV_KEY, .code = KEY_ESC,      .value = 2},
 ctrl_repeat     = {.type = EV_KEY, .code = KEY_LEFTCTRL, .value = 2},
-capslock_repeat = {.type = EV_KEY, .code = KEY_CAPSLOCK, .value = 2};
+capslock_repeat = {.type = EV_KEY, .code = KEY_CAPSLOCK, .value = 2},
+syn             = {.type = EV_SYN, .code = SYN_REPORT,   .value = 0};
 // clang-format on
 
 int equal(const struct input_event *first, const struct input_event *second) {
@@ -37,6 +39,9 @@ int main(void) {
     setbuf(stdin, NULL), setbuf(stdout, NULL);
 
     while (read_event(&input)) {
+        if (input.type == EV_MSC && input.code == MSC_SCAN)
+            continue;
+
         if (input.type != EV_KEY) {
             write_event(&input);
             continue;
@@ -55,6 +60,8 @@ int main(void) {
                     continue;
                 }
                 write_event(&esc_down);
+                write_event(&syn);
+                usleep(20000);
                 write_event(&esc_up);
                 continue;
             }
@@ -62,6 +69,8 @@ int main(void) {
             if (!esc_give_up && input.value) {
                 esc_give_up = 1;
                 write_event(&ctrl_down);
+                write_event(&syn);
+                usleep(20000);
             }
         } else if (equal(&input, &capslock_down)) {
             capslock_is_down = 1;