Generate iTerm Key Mappings with Python

itermkeymap.py

#!/usr/bin/env python3

import json
import string

prefix_key = "b" # My prefix key in tmux is Ctrl-B
prefix_hex = "02" # The hex code that iTerm sends (corresponds to Ctrl-B)

keys_upper = string.ascii_uppercase + r'!@#$%^&*()_+{}:"|<>?~'
keys_lower = string.ascii_lowercase + r"1234567890-=[];'\,./`"
keys_exclude = "xcvq" # Don't override cut, copy, paste, and quit shortcuts


mod = {"cmd": "100000",
       "cmd+ctrl": "140000",
       "option": "80000",
}

keys_all = "".join(sorted(set(keys_upper +
                              keys_lower).difference(keys_exclude)))

mappings = {}

# Cmd+<KEY> becomes Prefix <KEY>
# Cmd+Ctrl+<KEY> becomes Prefix Shift+<KEY>
for send_key in keys_all:

    send_hex = send_key.encode("utf-8").hex()

    if send_key in keys_upper:
        press_key = keys_lower[keys_upper.index(send_key)]
        press_mod = mod["cmd+ctrl"] # Command+Ctrl modifier
    else:
        press_key = send_key
        press_mod = mod["cmd"] # Command modifier

    press_hex = press_key.encode("utf-8").hex()

    mappings[f"0x{press_hex}-0x{press_mod}"] = {
            "Version": 1,
            "Action": 11, # Corresponds to "Send Hex Codes" action
            "Text": f"0x{prefix_hex} 0x{send_hex}", # Hex codes to send
            "Label": f"C-{prefix_key} {send_key}" # Nice for debugging
    }

# Option+<KEY> becomes Prefix Ctrl+<KEY>
# Generate Option+A through Option+Z
for i, send_key in enumerate(string.ascii_lowercase, start=1):
    send_hex = hex(i) # returns 0x01 for a, 0x02 for b, etc.

    press_mod = mod["option"] # Option modifier
    press_hex = send_key.encode("utf-8").hex()

    mappings[f"0x{press_hex}-0x{press_mod}"] = {
            "Version": 1,
            "Action": 11, # Corresponds to "Send Hex Codes" action
            "Text": f"0x{prefix_hex} {send_hex}", # Hex codes to send
            "Label": f"C-{prefix_key} C-{send_key}" # Nice for debugging
    }

result = {"Key Mappings": mappings}
print(json.dumps(result, indent=4))