[MarvinJWendt]

Requested by Marvin · project thread

Before: go.mod said go 1.15. Area and the package-level helpers shared unguarded state, and every Area used the global cursor, so Area.WithWriter also redirected cursor.SetTarget's cursor. On Windows, every writer needed a real console Fd(). Area.Down clamped to the wrong value. The Windows newline conversion turned \r\n into \r\r\n. cursor_test_linux.go was compiled into the library on Linux because of its file name. The tests ran in parallel while they changed global state.

After: go 1.27.0, with golang.org/x/sys as the only dependency. Cursor and Area are safe for concurrent use, and each Area owns its cursor. Cursor, Area and SetTarget work with any io.Writer. go vet, go test -race ./... and golangci-lint (Linux, Windows, macOS) pass. pterm's test suite also passes against this branch. There was no committed go.work, so there was nothing to remove.

How: Every Area method locks a mutex that NewArea creates. A zero-value Area falls back to a package-level lock. The helpers guard autoheight with a mutex. Cursor writes ANSI sequences on every platform. On Windows it uses the console API (through golang.org/x/sys/windows) only when the writer is a console that cannot turn on virtual terminal processing. The tests use in-memory buffers, and new tests cover concurrent use.

Breaking changes:

• Requires Go 1.27.
• SetTarget, Cursor.WithWriter and Area.WithWriter take an io.Writer instead of a cursor.Writer. Existing callers still compile. The cursor.Writer type remains.
• Area.WithWriter returns an Area with its own cursor and lock, and no longer changes the global cursor.
• On legacy Windows consoles, ClearLine now clears the whole line and Clear clears from the cursor to the end of the line, the same as the ANSI behavior.

🤖 Generated with Claude Code

https://claude.ai/code/session_011Dno7CsMx2fSzNx5ZTm7RL

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Generated by Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 75.20661% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.44%. Comparing base (93d4a5c) to head (d3d20f3).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
cursor.go	52.00%	3 Missing and 9 partials ⚠️
area.go	83.82%	11 Missing ⚠️
console_other.go	28.57%	5 Missing ⚠️
utils.go	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #26       +/-   ##
==========================================
+ Coverage   5.41%   75.44%   +70.03%     
==========================================
  Files          6        4        -2     
  Lines        240      167       -73     
==========================================
+ Hits          13      126      +113     
+ Misses       227       32      -195     
- Partials       0        9        +9     

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