gosmartkeyboard/docs/RawCapture.html

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<h1>Raw Capture<a id="c25"></a></h1>
<p>This tool captures keyboard input from /dev/input/eventX and pipes it to the fifo accordingly.</p>
<p>An escape sequence of <code>qkeyboard</code> (QWERTY) will exit the program, but this can be changed via a command line argument.</p>
<h2>1. Why<a id="s25:0"></a></h2>
<p>This mode is especially useful for workflows with a lot of keyboard shortcuts or use of modifier keys, for example i3wm.</p>
<p>Generally a user would be in this mode when not typing extensively.</p>
<h1>Entrypoint<a id="c26"></a></h1>
<div class="code-block">
<span class="block-header">
<strong class="block-title"><em><a id="-tools-rawcapture-rawcapture.py-block-89" href="#-tools-rawcapture-rawcapture.py-block-89">/tools/rawcapture/rawcapture.py</a></em></strong></span>
<pre class="prettyprint"><code class="">#!/usr/bin/python3
# This tool adapted from https://github.com/whizse/exclusive-keyboard-access by Sven Arvidsson
import os
import sys
import evdev
import traceback
import queue
import threading
# Docs http://python-evdev.readthedocs.io/en/latest/tutorial.html
device = ""
fifo = os.getenv("KEYBOARD_FIFO", "")
if not fifo:
print("KEYBOARD_FIFO not set, exiting.")
exit(0)
try:
dev_path = sys.argv[1]
try:
device = evdev.InputDevice(dev_path)
except PermissionError:
print("Insufficent permission to read, run me as root!")
exit(0)
except IndexError:
foundDev = []
allDev = [evdev.InputDevice(dev) for dev in evdev.list_devices()]
if len(allDev) == 0:
print("No devices found, run me as root!")
exit(0)
print("Found the following USB input devices: ")
count = 0
for device in allDev:
if "usb" in device.phys:
count += 1
foundDev.append(device)
print(str(count) + ". " + device.name, device.fn)
print("Select a device (1 to %s)" % str(len(foundDev)), end=" ")
i = int(input())
i -= 1
device = foundDev[i]
print("Using device " + device.fn)
print("Grabbing device for exclusive access.")
device.grab()
write_queue = queue.Queue()
def write_loop():
backlog = []
while True:
try:
while backlog:
with open(fifo, "w") as f:
f.write(backlog.pop(0))
data = write_queue.get()
with open(fifo, "w") as f:
f.write(data)
except Exception as e:
print("Error writing to fifo: " + str(e))
traceback.print_exc()
backlog
write_thread = threading.Thread(target=write_loop, daemon=True)
write_thread.start()
KEYMAP = {
1: "ESC",
2: "1",
3: "2",
4: "3",
5: "4",
6: "5",
7: "6",
8: "7",
9: "8",
10: "9",
11: "0",
12: "-",
13: "=",
14: "BS",
15: "TAB",
16: "Q",
17: "W",
18: "E",
19: "R",
20: "T",
21: "Y",
22: "U",
23: "I",
24: "O",
25: "P",
26: "[",
27: "]",
28: "ENTER",
29: "L_CTRL",
30: "A",
31: "S",
32: "D",
33: "F",
34: "G",
35: "H",
36: "J",
37: "K",
38: "L",
39: ";",
40: "'",
41: "`",
42: "L_SHIFT",
43: "\\",
44: "Z",
45: "X",
46: "C",
47: "V",
48: "B",
49: "N",
50: "M",
51: ",",
52: ".",
53: "/",
54: "R_SHIFT",
55: "*",
56: "L_ALT",
57: "SPACE",
58: "CAPS_LOCK",
59: "F1",
60: "F2",
61: "F3",
62: "F4",
63: "F5",
64: "F6",
65: "F7",
66: "F8",
67: "F9",
68: "F10",
69: "NUM_LOCK",
70: "SCROLL_LOCK",
71: "HOME",
72: "UP_8",
73: "PGUP_9",
74: "-",
75: "LEFT_4",
76: "5",
77: "RT_ARROW_6",
78: "+",
79: "END_1",
80: "DOWN",
81: "PGDN_3",
82: "INS",
83: "DEL",
84: "",
85: "",
86: "",
87: "F11",
88: "F12",
89: "",
90: "",
91: "",
92: "",
93: "",
94: "",
95: "",
96: "R_ENTER",
97: "R_CTRL",
98: "/",
99: "PRT_SCR",
100: "R_ALT",
101: "",
102: "HOME",
103: "UP",
104: "PGUP",
105: "LEFT",
106: "RIGHT",
107: "END",
108: "DOWN",
109: "PGDN",
110: "INSERT",
111: "DEL",
112: "",
113: "",
114: "",
115: "",
116: "",
117: "",
118: "",
119: "PAUSE",
120: "",
121: "",
122: "",
123: "",
124: "",
125: "SUPER"
}
key_str = ""
log = []
quit_str = "QKEYBOARD"
quit_list = []
for c in quit_str:
for k, v in KEYMAP.items():
if v == c:
quit_list.append(k)
break
def quit_if_necessry(log):
if len(log) &gt; len(quit_list):
log.pop(0)
if log == quit_list:
print("Quitting...")
raise SystemExit
try:
for event in device.read_loop():
if event.type == evdev.ecodes.EV_KEY:
if event:
print(event)
#e_code = event.code - 1
e_code = event.code
try:
key_str = KEYMAP[e_code]
except KeyError:
print("Unknown key: " + str(e_code))
if event.value == 1:
key_str = "{KEYDWN}" + key_str
log.append(e_code)
quit_if_necessry(log)
elif event.value == 0:
key_str = "{KEYUP}" + key_str
elif event.value == 2:
key_str = "{KEYHLD}" + key_str
else:
print("Unknown value: " + str(event.value))
continue
write_queue.put(key_str)
sys.stdout.flush()
except (KeyboardInterrupt, SystemExit, OSError):
print(traceback.format_exc())
device.ungrab()
print("\rGoodbye!")
exit(0)
</code></pre>
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