[haskeline] #84: Vi mode breaks compatibility with readline: missing commands

[haskeline]

#84: Vi mode breaks compatibility with readline: missing commands
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Reporter:  jdanbrown  |        Owner:       
    Type:  defect     |       Status:  new  
Priority:  major      |    Milestone:  0.6.2
 Version:  0.6        |   Resolution:       
Keywords:             |  
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Changes (by jdanbrown):

  * summary:  Vi mode noticeably not backward compatible with readline =>
              Vi mode breaks compatibility with readline:
              missing commands

Old description:

> Thank you for implementing vi line editing—but please also finish the
> implementation!
>
> 1. libreadline has an extensive set of vi commands that most replacement
> libraries fail to match. Here are just a few command-mode keys that I
> notice don't work:
>
>   j - previous line in history[[BR]]
>   k - next line in history[[BR]]
>   e - end of word[[BR]]
>   E - end of bigword[[BR]]
>   f - find character[[BR]]
>   F - find character (backward)[[BR]]
>   t - find character-1[[BR]]
>   T - find character-1 (backward)[[BR]]
>   D - delete rest of line[[BR]]
>   C - change rest of line (delete, then enter insert mode)[[BR]]
>   !^ - go to first non-whitespace character in line[[BR]]
>   p - paste (pos+1)[[BR]]
>   P - paste[[BR]]
>   !^D - enter, when line is not empty[[BR]]
>   % - jump to matching brace: () {} [][[BR]]
>   . - repeat previous command[[BR]]
>   X - delete previous character
>
> 2. Using up/down in command mode puts the cursor at the end of the line,
> whereas readline puts it at the beginning of the line. I'm not sure
> whether one is more convenient or correct, but UI consistency is more
> important here and every other program I encounter uses libreadline.
>
> 3. Both vim and libreadline handle 'cw' specially: instead of deleting
> the sequence of text moved through by the 'w' movement command—the rest
> of the word and any trailing whitespace—it only deletes the rest of the
> word. So 'cw'/'ce' and 'cW'/'cE' are synonymous even though 'dw'/'de' and
> 'dW'/'dE' aren't.

New description:

 libreadline includes an extensive set of vi commands that most replacement
 libraries fail to match. I started a wiki page to keep track of the ones
 I've noticed missing in haskeline: ViModeCompatibility.

Comment:

 Split into one wiki page and two new tickets.

-- 
Ticket URL: <http://trac.haskell.org/haskeline/ticket/84#comment:11>
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