keymapper.conf

# define some aliases
Alt   = AltLeft
AltGr = AltRight
Win   = Meta

# immediately forward common modifier keys (also used as mouse modifiers)
Shift   >> Shift
Control >> Control
Alt     >> Alt

# define a virtual "boss" key, which can be toggled using the scroll-lock key
# when the boss key is "pressed", the keyboard should be intuitively useable
Boss = Virtual1
ScrollLock >> Boss

# add mappings in context which is active when boss key is not pressed
[modifier="!Boss"]
  # map Capslock to Backspace
  Control{CapsLock} >> CapsLock
  CapsLock          >> Backspace

  # define an additional modifier "Ext" (angular bracket key on some keyboards)
  Ext = IntlBackslash

  # the Ext modifier alone should have no effect
  Ext >>

  # map Ext-S/D/F to Alt/Shift/Control
  Ext{S}               >> AltLeft
  Ext{D}               >> Shift
  Ext{F}               >> Control
  Ext{A}               >> AltLeft   # also map A because of S/D rollover

  # Ext-W and the navigation keys should step in/out/over during debugging
  Ext{W{L}}            >> debug_step_into
  Ext{W{J}}            >> debug_step_out
  Ext{W{K}}            >> debug_step_over
  Ext{W{Any}}          >>

  # map Ext-I/J/K/L to cursor keys...
  Ext{I}               >> ArrowUp
  Ext{K}               >> ArrowDown
  Ext{J}               >> ArrowLeft
  Ext{L}               >> ArrowRight
  Ext{U}               >> cursor_home
  Ext{O}               >> cursor_end
  Ext{Y}               >> PageUp
  Ext{H}               >> PageDown

  Ext{Semicolon}       >> Backspace
  Ext{Q}               >> navigate_escape
  Ext{Space}           >> Space
  Ext{M}               >> Enter

  Ext{X}               >> Control{X}
  Ext{C}               >> Control{C}
  Ext{V}               >> edit_paste
  Ext{E}               >> Control{F}
  (Ext Shift){Z}       >> edit_redo
  Ext{Z}               >> Control{Y}

  Ext{Comma}           >> navigate_back
  Ext{Period}          >> navigate_fore
  Ext{T}               >> open_file
  Ext{G}               >> go_to_definition
  Ext{BracketRight}    >> AudioVolumeUp
  Ext{BracketLeft}     >> AudioVolumeDown
  Ext{R}               >> Delete
  Ext{B}               >> build

  # map Ext-number keys to function keys
  Ext{1}               >> F1
  Ext{2}               >> edit_rename
  Ext{3}               >> F3
  Ext{4}               >> F4
  Ext{5}               >> F5
  Ext{6}               >> F6
  Ext{7}               >> F7
  Ext{8}               >> F8
  Ext{9}               >> F9
  Ext{0}               >> F10
  Ext{Minus}           >> F11
  Ext{Equal}           >> F12

  # the Ext modifier together with other keys should have no effect
  Ext{Any}             >>

  # add some Windows-key commands
  Win{C}               >> open_terminal
  Win{Q}               >> close_window
  Win{A}               >> lower_window
  Win{Tab}             >> next_tab
  (Win Shift){Tab}     >> prev_tab
  (Win Control Alt){S} >> suspend_machine
  (Win Control Alt){P} >> poweroff_machine
  (Win Control Alt){R} >> reboot_machine

  # pass other Windows key combinations unmapped
  Win{Any}             >> Win{Any}

  # colemak layout mapping (on german layout)
  AltGr{I}             >> !AltGr BracketLeft      # ü
  AltGr{A}             >> !AltGr Quote            # ä
  AltGr{Semicolon}     >> !AltGr Semicolon        # ö
  AltGr{D}             >> !AltGr Minus            # ß
  AltGr{Backquote}     >> !AltGr Shift{Backquote} # °

  E                    >> F
  R                    >> P
  T                    >> G
  Y                    >> J
  U                    >> L
  I                    >> U
  O                    >> Z
  Z                    >> Y
  Shift{P}             >> Period
  P                    >> Shift{Comma}
  S                    >> R
  D                    >> S
  F                    >> T
  G                    >> D
  J                    >> N
  K                    >> E
  L                    >> I
  Semicolon            >> O
  N                    >> K

  Shift{Quote}         >> Shift{2}
  Quote                >> Shift{Backslash}
  Shift{Period}        >> Shift{IntlBackslash}
  Shift{Comma}         >> !Shift IntlBackslash
  Shift{BracketLeft}   >> !Shift AltGr{7}
  BracketLeft          >> AltGr{8}
  Shift{BracketRight}  >> !Shift AltGr{0}
  BracketRight         >> AltGr{9}
  Shift{Backquote}     >> Equal Space
  Backquote            >> AltGr{BracketRight}
  Shift{2}             >> !Shift AltGr{Q}
  Shift{3}             >> !Shift Backslash
  Shift{6}             >> !Shift Backquote Space
  Shift{7}             >> Shift{6}
  Shift{8}             >> BracketRight
  Shift{9}             >> Shift{8}
  Shift{0}             >> Shift{9}
  Minus                >> Slash
  Shift{Equal}         >> !Shift BracketRight
  Equal                >> Shift{0}
  Shift{Backslash}     >> !Shift AltGr{IntlBackslash}
  Backslash            >> AltGr{Minus}
  Shift{Slash}         >> Shift{Minus}
  Slash                >> Shift{7}

  # default mappings for abstract commands
  close_window         >> !Win Alt{F4}
  navigate_escape      >> Escape
  cursor_home          >> !Control Home
  cursor_end           >> !Control End
  open_file            >> Control{O}
  navigate_back        >> Alt{ArrowLeft}
  navigate_fore        >> Alt{ArrowRight}
  next_tab             >> !Win Control{PageUp}
  prev_tab             >> !Win Control{PageDown}
  edit_paste           >> Control{V}
  edit_redo            >> !Shift Control{Z}
  build                >> Control{B}
  debug_step_over      >> F10
  debug_step_into      >> F11
  debug_step_out       >> Shift{F11}
  edit_rename          >> F2

# system/application specific mappings for abstract commands
[system="Linux"]
  suspend_machine      >> (Win Control Alt){S}
  poweroff_machine     >> (Win Control Alt){P}
  reboot_machine       >> (Win Control Alt){R}
  lower_window         >> !Win (Alt Shift){PageDown}
  open_terminal        >> Win{C}

[system="Linux" class="Thunar"]
  cursor_home          >> Backspace
  cursor_end           >> Enter
  open_terminal        >> !Win (Shift Control){C}

[system="Linux" class="tilix"]
  close_window         >> !Win (Shift Control){W}
  edit_paste           >> (Shift Control){V}
  open_terminal        >> !Win ContextMenu ^ Enter

[system="Windows"]
  suspend_machine      >> !Control !Alt Win{X} ^ R E
  poweroff_machine     >> !Control !Alt Win{X} ^ R R
  reboot_machine       >> !Control !Alt Win{X} ^ R N
  lower_window         >> !Win Alt{Escape}
  open_terminal        >> Win{R} ^ C M D Enter

[system="Windows" class="CabinetWClass"] # Windows Explorer
  open_terminal        >> F4 ^ Control{A} C M D Enter

[title="Mozilla Firefox"]
  open_file            >> Control{K}
  navigate_escape      >> Escape Control{F} Escape
  go_to_definition     >> Shift{Backslash}

[title="Chromium"]
  open_file            >> Control{L}
  navigate_escape      >> Control{L} F6

[title="Qt Creator"]
  open_file            >> Control{K}
  go_to_definition     >> F2
  edit_redo            >> (Control Shift){Y}
  edit_rename          >> (Control Shift){R}

[title=/Code - OSS|Visual Studio Code/]
  go_to_definition     >> F12
  navigate_back        >> (Control Alt){Slash}
  navigate_fore        >> (Control Shift){Slash}
  build                >> (Control Shift){B}

[title="Visual Studio"]
  go_to_definition     >> F12
  navigate_back        >> Control{Slash}
  navigate_fore        >> (Control Shift){Slash}
  build                >> (Control Shift){B}

[title="Geany"]
  go_to_definition     >> (Control Shift){T}