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 UserPrefs for more details.

As of version 0.5, the user may specify custom key bindings in their .haskeline file.

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
Return	finish the line entry
Backspace	delete the character left of the cursor
Delete	delete the character right of the cursor
[printable char]	insert a character
Up/down arrow	move backwards/forwards in the command history
Tab	run tab completion
^L	clear the screen
^R	search backwards in history
^S	search forwards in history
[kill]	delete until the start of the line

Emacs-specific bindings

^A	move to the start of the line
^E	move to the end of the line
^B	move left one character
^F	move right one char
^_ or ^X^U	undo
^D	delete the character to the right of the cursor
	^D is treated as an EOF if the input line is empty and the last character pressed was not also ^D.
M-F	move forwards one word
M-B	move backward one word
M-W	delete backwards one "big word"
M-Backspace	delete backwards one word
M-D	delete forwards one word
^K	delete until the end of the line

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
I	enter insert mode at the start of the line
a	enter insert mode after the current character
A	enter insert mode at end of the line
s	delete the char under the cursor and enter insert mode
S	clear the line and enter insert mode
r	replace one character
R	replace many characters
u	undo
. or ^R	redo
[n][movement]	do a movement, repeated n times
[n]d[movement]	delete the characters the movement would move past
[n]c[movement]	delete the characters the movement would move past, and enter insert mode
[n]x	delete the character under the cursor (repeated n times)
dd	delete the whole line
cc	delete the whole line and enter insertmode

The movement commands are:

h	left one character
l	right one character
[space]	right one character
w	right one word
b	left one word
W	right one bigword
B	left one bigword
0	move to the start of the line
$	move to the end of the line