Install ComfyUI.
Install ComfyUI-Manager
Look up this extension in ComfyUI-Manager. If you are installing manually, clone this repository under ComfyUI/custom_nodes.
Restart ComfyUI.

Features

PromptPresetSelector node

Inputs

syntax (str), default to {% | %} — defines the opening tag, separator, and closing tag as a single field, space-separated
preset_index (int), 0-based, default to 0 — loops both ways within range
preset_name (combo) — dynamic dropdown, active when preset_names is filled
preset_names (str), optional — comma-separated list of preset names. Ex: neutral, happy, sad. If fewer names than presets, remaining are auto-named (preset_2, preset_3...). If more, extra names are ignored.
text (str), multiline textarea supporting preset blocks
cleanup (bool), default to True

Outputs

text (str) — the formatted text, with preset blocks resolved
preset_index (int) — the selected index
preset_count (int) — the number of presets found across blocks

Usage

Include preset blocks in your text using the syntax defined in the syntax field. Each block holds options separated by the separator. Depending on preset_index, the matching option is injected and the block markers are removed.

This is {% an example | a text | another text %} for {% the PromptPresetSelector | the README | %}

preset_index = 0 -> This is an example for the PromptPresetSelector
preset_index = 1 -> This is a text for the README
preset_index = 2 -> This is another text for

Empty presets are allowed — the block is simply replaced by an empty string.

Custom syntax

The syntax field allows changing the opening tag, separator and closing tag. Format is always open_tag separator close_tag, space-separated.

<< / >>

Would match blocks like << option_a / option_b >>.

Validation

The node runs the following checks and stops the workflow on error:

syntax must contain exactly 3 space-separated parts
open_tag and close_tag must be different
All preset blocks in text must have the same number of options
preset_index must be within range

Cleanup

When cleanup is enabled, the following are removed from the output:

Spaces before commas
Double or empty commas
Empty lines

Web — PromptPresetSelector editor

The text widget is replaced by a contentEditable div that provides syntax highlighting:

Tags and separators are highlighted in orange
The active preset is shown in full brightness
Inactive presets are grayed out
Colors are displayed when the field loses focus, and revert to plain text while editing
Highlighting updates live when syntax, preset_index or preset_name are changed

When preset_names is filled, preset_index is replaced by a dynamic dropdown (preset_name) built from the comma-separated names. The dropdown resets to the first preset when activated.

TODO

Add a field to easily concatenate text at the end of the output
Add color even when in edit mode
Wildcard mode for presets (randomly selected, index to -1 or -2?)