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

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* 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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README.md
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@ -529,9 +529,10 @@ See *KEY BINDINGS* section of the man page for details.
### Preview window ### Preview window
When `--preview` option is set, fzf automatically starts an external process with When the `--preview` option is set, fzf automatically starts an external process
the current line as the argument and shows the result in the split window. Your with the current line as the argument and shows the result in the split window.
`$SHELL` is used to execute the command with `$SHELL -c COMMAND`. 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 ```bash
# {} is replaced to the single-quoted string of the focused line # {} 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 Preview window supports ANSI colors, so you can use any program that
syntax-highlights the content of a file. syntax-highlights the content of a file, such as
[Bat](https://github.com/sharkdp/bat) or
- Bat: https://github.com/sharkdp/bat [Highlight](http://www.andre-simon.de/doku/highlight/en/highlight.php):
- Highlight: http://www.andre-simon.de/doku/highlight/en/highlight.php
```bash ```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 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! ** # ** 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 # bat doesn't work with any input other than the list of files
ps -ef | fzf ps -ef | fzf