README: Use --line-range instead of head in bat example (#2064)

* Use --line-range instead of head in bat example

* README: extend preview section
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Janek 2020-06-04 04:57:01 +02:00 committed by GitHub
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@ -529,9 +529,10 @@ See *KEY BINDINGS* section of the man page for details.
### Preview window
When `--preview` option is set, fzf automatically starts an external process with
the current line as the argument and shows the result in the split window. Your
`$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
When the `--preview` option is set, fzf automatically starts an external process
with the current line as the argument and shows the result in the split window.
Your `$SHELL` is used to execute the command with `$SHELL -c COMMAND`.
The window can be scrolled using the mouse or custom key bindings.
```bash
# {} is replaced to the single-quoted string of the focused line
@ -547,13 +548,12 @@ fzf --preview 'head -100 {}'
```
Preview window supports ANSI colors, so you can use any program that
syntax-highlights the content of a file.
- Bat: https://github.com/sharkdp/bat
- Highlight: http://www.andre-simon.de/doku/highlight/en/highlight.php
syntax-highlights the content of a file, such as
[Bat](https://github.com/sharkdp/bat) or
[Highlight](http://www.andre-simon.de/doku/highlight/en/highlight.php):
```bash
fzf --preview 'bat --style=numbers --color=always {} | head -500'
fzf --preview 'bat --style=numbers --color=always --line-range :500 {}'
```
You can customize the size, position, and border of the preview window using
@ -582,7 +582,7 @@ not a good idea to add `--preview` option to your `$FZF_DEFAULT_OPTS`**.
# *********************
# ** DO NOT DO THIS! **
# *********************
export FZF_DEFAULT_OPTS='--preview "bat --style=numbers --color=always {} | head -500"'
export FZF_DEFAULT_OPTS='--preview "bat --style=numbers --color=always --line-range :500 {}"'
# bat doesn't work with any input other than the list of files
ps -ef | fzf