Key Bindings
Haskeline provides a line-editing user interface with many interactivity commands. Currently the user may choose either Emacs or Vi style bindings by editing the ~/.haskeline file; see System.Console.Haskeline.Prefs for more details.
Definitions:
- ^A: Control-A
- M-A: Option-A
- [printable char]: Any Unicode printable character (Data.Char.isPrint returns True)
- [kill]: the console's 'kill' character (usually ^U)
Commands shared by both bindings
| Left/right arrow | move the cursor left/right by one character
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| Return | finish the line entry
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| Backspace | delete the character left of the cursor
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| Delete | delete the character right of the cursor
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| [printable char] | insert a character
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| Up/down arrow | move backwards/forwards in the command history
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| Tab | run tab completion
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| ^L | clear the screen
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| ^R | search backwards in history
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| ^S | search forwards in history
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| [kill] | delete until the start of the line
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Emacs-specific bindings
| ^A | move to the start of the line
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| ^E | move to the end of the line
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| ^B | move left one character
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| ^F | move right one char
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| ^_ or ^X^U | undo
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| ^D | delete the character to the right of the cursor
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| | ^D is treated as an EOF if the input line is empty and the last character pressed was not also ^D.
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| M-F | move forwards one word
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| M-B | move backward one word
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| M-W | delete backwards one "big word"
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| M-Backspace | delete backwards one word
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| M-D | delete forwards one word
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| ^K | delete until the end of the line
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Vi-specific bindings
The Vi bindings start in "insert mode" allowing all of the shared commands listed above. If ^D is typed when the line is empty, it is treated as an EOF; otherwise, it is ignored. Pressing ESCAPE enters the "command mode" which provides all of the shared commands except
for [printable char] and Tab, allowing instead the following commands:
| i | enter insert mode
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| I | enter insert mode at the start of the line
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| a | enter insert mode after the current character
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| A | enter insert mode at end of the line
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| s | delete the char under the cursor and enter insert mode
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| S | clear the line and enter insert mode
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| r | replace one character
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| R | replace many characters
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| u | undo
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| . or ^R | redo
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| [n][movement] | do a movement, repeated n times
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| [n]d[movement] | delete the characters the movement would move past
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| [n]c[movement] | delete the characters the movement would move past, and enter insert mode
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| [n]x | delete the character under the cursor (repeated n times)
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| dd | delete the whole line
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| cc | delete the whole line and enter insertmode
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The movement commands are:
| h | left one character
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| l | right one character
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| [space] | right one character
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| w | right one word
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| b | left one word
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| W | right one bigword
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| B | left one bigword
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| 0 | move to the start of the line
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| $ | move to the end of the line
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