codefmt

Formatting files through the IntelliJ IDE/OpenIDE

This project runs inside a live IntelliJ IDEA instance reachable through the MCP Steroid tools. The IDE's own formatter (ReformatCodeProcessor) applies the project's configured code style — the same result a developer gets from Code → Reformat Code. Driving it through the IDE (rather than an external CLI formatter) means the style always matches what the team sees, and the IDE's VFS/PSI/index caches stay consistent after the edit.

Prerequisites

1. Load the MCP Steroid tools if they aren't already available — their schemas are deferred in Claude Code: ToolSearch("steroid list projects execute code") then use steroid_list_projects and steroid_execute_code.
2. Get the routing key: call steroid_list_projects and take the project_name (the opaque key, e.g. spring-petclinic-ipvczgii), not the human-readable name. Every steroid_execute_code call needs this key.
3. Run all formatting code with modal: "smart_non_modal" (the default). It commits documents and refreshes the VFS around your script, which is exactly what formatting needs.

Choosing the recipe

The user wants to format…	Use
One file named by path or class name	Single file
A specific block / line range in a file	Code block
Every uncommitted / changed file	All uncommitted files → run the bundled script
Several named files at once	A group of named files

Always report back what actually changed — run git diff --stat <paths> after formatting. It's normal and correct for a reformat to produce no diff when the file already conforms to the code style; say so plainly rather than implying work was done.

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1. Single file by name

Script: scripts/format-single-file.kts.

To run it: read the script, edit the name / pathSuffix placeholders at the top to point at the target file, then pass the body as the code argument to steroid_execute_code. Drop the OptimizeImportsProcessor line for non-JVM files.

2. Code block (line range)

Script: scripts/format-code-block.kts.

To run it: read the script, edit the name / startLine / endLine placeholders, then pass the body as the code argument to steroid_execute_code. If the user pasted a snippet rather than a line range, build the TextRange from indexOf(snippet) instead — see the header comment in the script.

3. All uncommitted files

This is a bundled, validated script: scripts/format-uncommitted.kts.

To run it: read the script file and pass its body as the code argument to steroid_execute_code (project_name = the routing key, modal: "smart_non_modal"). It's self-contained — no arguments needed. Afterward, run git status --porcelain / git diff --stat to show the user the result.

Adjust the FORMATTABLE extension set at the top of the script if the user wants a narrower or wider net (e.g. only java).

4. A group of named files

Script: scripts/format-file-group.kts.

To run it: read the script, edit the requested list to the target files, then pass the body as the code argument to steroid_execute_code.