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docs(ADVANCED.md): Add fzf example switching ripgrep/fzf with single hotkey (#3590)

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@ -1,8 +1,8 @@
Advanced fzf examples
======================
* *Last update: 2023/12/29*
* *Requires fzf 0.45.0 or above*
* *Last update: 2024/01/20*
* *Requires fzf 0.46.0 or above*
---
@ -22,6 +22,7 @@ Advanced fzf examples
* [Using fzf as interactive Ripgrep launcher](#using-fzf-as-interactive-ripgrep-launcher)
* [Switching to fzf-only search mode](#switching-to-fzf-only-search-mode)
* [Switching between Ripgrep mode and fzf mode](#switching-between-ripgrep-mode-and-fzf-mode)
* [Switching between Ripgrep mode and fzf mode using a single key binding](#switching-between-ripgrep-mode-and-fzf-mode-using-a-single-key-binding)
* [Log tailing](#log-tailing)
* [Key bindings for git objects](#key-bindings-for-git-objects)
* [Files listed in `git status`](#files-listed-in-git-status)
@ -467,6 +468,41 @@ INITIAL_QUERY="${*:-}"
[0.30.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0300
[0.36.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0360
### Switching between Ripgrep mode and fzf mode using a single key binding
In contrast to the previous version, we use just one hotkey to toggle between
ripgrep and fzf mode. This is achieved by using the `$FZF_PROMPT` as a state
within the `transform` action, a feature introduced in [fzf 0.45.0][0.45.0]. A
more detailed explanation of this feature can be found in a previous section -
[Toggling with a single keybinding](#toggling-with-a-single-key-binding).
[0.45.0]: https://github.com/junegunn/fzf/blob/master/CHANGELOG.md#0450
When using the `transform` action, the placeholder (`\{q}`) should be escaped to
prevent immediate evaluation.
```sh
#!/usr/bin/env bash
# Switch between Ripgrep mode and fzf filtering mode (CTRL-T)
rm -f /tmp/rg-fzf-{r,f}
RG_PREFIX="rg --column --line-number --no-heading --color=always --smart-case "
INITIAL_QUERY="${*:-}"
: | fzf --ansi --disabled --query "$INITIAL_QUERY" \
--bind "start:reload:$RG_PREFIX {q}" \
--bind "change:reload:sleep 0.1; $RG_PREFIX {q} || true" \
--bind 'ctrl-t:transform:[[ ! $FZF_PROMPT =~ ripgrep ]] &&
echo "rebind(change)+change-prompt(1. ripgrep> )+disable-search+transform-query:echo \{q} > /tmp/rg-fzf-f; cat /tmp/rg-fzf-r" ||
echo "unbind(change)+change-prompt(2. fzf> )+enable-search+transform-query:echo \{q} > /tmp/rg-fzf-r; cat /tmp/rg-fzf-f"' \
--color "hl:-1:underline,hl+:-1:underline:reverse" \
--prompt '1. ripgrep> ' \
--delimiter : \
--header 'CTRL-T: Switch between ripgrep/fzf' \
--preview 'bat --color=always {1} --highlight-line {2}' \
--preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
--bind 'enter:become(vim {1} +{2})'
```
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