Make bindings configurable from alacritty.yml

Bindings were previously hardcoded within input.rs; adding, removing, or
changing a binding required a recompile! Now, bindings may be declared
in alacritty.yml. Even better, bindings are live-reloaded when
alacritty.yml is changed!

One unexpected benefit of this change was that all of the special casing
in input.rs has disappeared.

Conversely, config.rs has gained complexity for all of the
deserialization logic.

Resolves #3.

1 files changed, 91 insertions, 0 deletions

diff --git a/alacritty.yml b/alacritty.yml
index 5f1f4359..97914968 100644
--- a/alacritty.yml
+++ b/alacritty.yml
@@ -85,3 +85,94 @@ colors:
 #     magenta: '0x6c71c4'
 #     cyan:    '0x93a1a1'
 #     white:   '0xfdf6e3'
+
+# Key bindings
+#
+# Each binding is defined as an object with some properties. Most of the
+# properties are optional. All of the alphabetical keys should have a letter for
+# the `key` value such as `V`. Function keys are probably what you would expect
+# as well (F1, F2, ..). The number keys above the main keyboard are encoded as
+# `Key1`, `Key2`, etc. Keys on the number pad are encoded `Number1`, `Number2`,
+# etc.  These all match the glutin::VirtualKeyCode variants.
+#
+# Possible values for `mods`
+# `Command`, `Super` refer to the super/command/windows key
+# `Control` for the control key
+# `Shift` for the Shift key
+# `Alt` and `Option` refer to alt/option
+#
+# mods may be combined with a `|`. For example, requiring control and shift
+# looks like:
+#
+# mods: Control|Shift
+#
+# The parser is currently quite sensitive to whitespace and capitalization -
+# capitalization must match exactly, and piped items must not have whitespace
+# around them.
+#
+# Either an `action` or `chars` field must be present. `chars` writes the
+# specified string every time that binding is activated. These should generally
+# be escape sequences, but they can be configured to send arbitrary strings of
+# bytes. Possible values of `action` include `Paste` and `PasteSelection`.
+key_bindings:
+  - { key: V,        mods: Command, action: Paste                        }
+  - { key: Home,                    chars: "\x1b[H",   mode: ~AppCursor  }
+  - { key: Home,                    chars: "\x1b[1~",  mode: AppCursor   }
+  - { key: End,                     chars: "\x1b[F",   mode: ~AppCursor  }
+  - { key: End,                     chars: "\x1b[4~",  mode: AppCursor   }
+  - { key: PageUp,                  chars: "\x1b[5~"                     }
+  - { key: PageDown,                chars: "\x1b[6~"                     }
+  - { key: Left,     mods: Shift,   chars: "\x1b[1;2D"                   }
+  - { key: Left,     mods: Control, chars: "\x1b[1;5D"                   }
+  - { key: Left,     mods: Alt,     chars: "\x1b[1;3D"                   }
+  - { key: Left,                    chars: "\x1b[D",   mode: ~AppCursor  }
+  - { key: Left,                    chars: "\x1bOD",   mode: AppCursor   }
+  - { key: Right,    mods: Shift,   chars: "\x1b[1;2C"                   }
+  - { key: Right,    mods: Control, chars: "\x1b[1;5C"                   }
+  - { key: Right,    mods: Alt,     chars: "\x1b[1;3C"                   }
+  - { key: Right,                   chars: "\x1b[C",   mode: ~AppCursor  }
+  - { key: Right,                   chars: "\x1bOC",   mode: AppCursor   }
+  - { key: Up,       mods: Shift,   chars: "\x1b[1;2A"                   }
+  - { key: Up,       mods: Control, chars: "\x1b[1;5A"                   }
+  - { key: Up,       mods: Alt,     chars: "\x1b[1;3A"                   }
+  - { key: Up,                      chars: "\x1b[A",   mode: ~AppCursor  }
+  - { key: Up,                      chars: "\x1bOA",   mode: AppCursor   }
+  - { key: Down,     mods: Shift,   chars: "\x1b[1;2B"                   }
+  - { key: Down,     mods: Control, chars: "\x1b[1;5B"                   }
+  - { key: Down,     mods: Alt,     chars: "\x1b[1;3B"                   }
+  - { key: Down,                    chars: "\x1b[B",   mode: ~AppCursor  }
+  - { key: Down,                    chars: "\x1bOB",   mode: AppCursor   }
+  - { key: F1,                      chars: "\x1bOP"                      }
+  - { key: F2,                      chars: "\x1bOQ"                      }
+  - { key: F3,                      chars: "\x1bOR"                      }
+  - { key: F4,                      chars: "\x1bOS"                      }
+  - { key: F5,                      chars: "\x1b[15~"                    }
+  - { key: F6,                      chars: "\x1b[17~"                    }
+  - { key: F7,                      chars: "\x1b[18~"                    }
+  - { key: F8,                      chars: "\x1b[19~"                    }
+  - { key: F9,                      chars: "\x1b[20~"                    }
+  - { key: F10,                     chars: "\x1b[21~"                    }
+  - { key: F11,                     chars: "\x1b[23~"                    }
+  - { key: F12,                     chars: "\x1b[24~"                    }
+  - { key: Back,                    chars: "\x7f"                        }
+  - { key: Delete,                  chars: "\x1b[3~",  mode: AppKeypad   }
+  - { key: Delete,                  chars: "\x1b[P",   mode: ~AppKeypad  }
+
+# Mouse bindings
+#
+# Currently doesn't support modifiers. Both the `mouse` and `action` fields must
+# be specified.
+#
+# Values for `mouse`:
+# - Middle
+# - Left
+# - Right
+# - Numeric identifier such as `5`
+#
+# Values for `action`:
+# - Paste
+# - PasteSelection
+# - Copy (TODO)
+mouse:
+  - { mouse: Middle, action: PasteSelection }
+