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ADVANCED.md: Add toggling example with `transform` and `{fzf:prompt}`
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ADVANCED.md
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ADVANCED.md
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Advanced fzf examples
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======================
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* *Last update: 2023/05/26*
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* *Requires fzf 0.41.0 or above*
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* *Last update: 2023/12/29*
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* *Requires fzf 0.45.0 or above*
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---
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* [Dynamic reloading of the list](#dynamic-reloading-of-the-list)
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* [Updating the list of processes by pressing CTRL-R](#updating-the-list-of-processes-by-pressing-ctrl-r)
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* [Toggling between data sources](#toggling-between-data-sources)
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* [Toggling with a single key binding](#toggling-with-a-single-key-binding)
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* [Ripgrep integration](#ripgrep-integration)
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* [Using fzf as the secondary filter](#using-fzf-as-the-secondary-filter)
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* [Using fzf as interactive Ripgrep launcher](#using-fzf-as-interactive-ripgrep-launcher)
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@ -208,6 +209,30 @@ find * | fzf --prompt 'All> ' \
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![image](https://user-images.githubusercontent.com/700826/113465072-46321c00-946c-11eb-9b6f-cda3951df579.png)
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### Toggling with a single key binding
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The above example uses two different key bindings to toggle between two modes,
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but can we just use a single key binding?
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To make a key binding behave differently each time it is pressed, we need:
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1. a way to store the current state. i.e. "which mode are we in?"
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2. and a way to dynamically perform different actions depending on the state.
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The following example shows how to 1. store the current mode in the prompt
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string, 2. and use this information (`{fzf:prompt}`) to determine which
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actions to perform using the `transform` action.
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```sh
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fd --type file |
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fzf --prompt 'Files> ' \
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--header 'CTRL-T: Switch between Files/Directories' \
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--bind 'ctrl-t:transform:[[ ! {fzf:prompt} =~ Files ]] &&
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echo "change-prompt(Files> )+reload(fd --type file)" ||
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echo "change-prompt(Directories> )+reload(fd --type directory)"' \
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--preview '[[ {fzf:prompt} =~ Files ]] && bat --color=always {} || tree -C {}'
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```
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Ripgrep integration
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-------------------
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