tldr/pages/common/sg.md

21 lines
701 B
Markdown

# sg
> Ast-grep is a tool for code structural search, lint, and rewriting.
> More information: <https://ast-grep.github.io/guide/introduction.html>.
- Scan for possible queries using interactive mode:
`sg scan --interactive`
- Rewrite code in the current directory using patterns:
`sg run --pattern '{{foo}}' --rewrite '{{bar}}' --lang {{python}}`
- Visualize possible changes without applying them:
`sg run --pattern '{{useState<number>($A)}}' --rewrite '{{useState($A)}}' --lang {{typescript}}`
- Output results as JSON, extract information using `jq` and interactively view it using `jless`:
`sg run --pattern '{{Some($A)}}' --rewrite '{{None}}' --json | jq '{{.[].replacement}}' | jless`