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Improve preview window update events

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- Update preview window even if there is no match for the query string
  if any of the placeholder expressions evaluates to a non-empty string.
- Also, if the command template contains {q}, preview window will be
  updated if the query string changes even though the focus remains on
  the same item.

An example:

    git log --oneline --color=always |
       fzf --reverse --ansi --preview \
       '[ -n {1} ] && git show --color=always {1} || git show --color=always {q}'

Close #1307
This commit is contained in:
Junegunn Choi
2018-06-10 01:40:22 +09:00
parent af87650bc4
commit 2c26f02f5c
3 changed files with 67 additions and 8 deletions
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man/man1/fzf.1
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@@ -291,6 +291,9 @@ from the replacement string. To preserve the whitespace, use the \fBs\fR flag.
Also, \fB{q}\fR is replaced to the current query string.
Note that you can escape a placeholder pattern by prepending a backslash.
Preview window will be updated even when there is no match for the current
query if any of the placeholder expressions evaluates to a non-empty string.
.RE
.TP
.BI "--preview-window=" "[POSITION][:SIZE[%]][:wrap][:hidden]"