tree f186077564033852cc9784fd23bb19968ec4d405
parent a7b4d4c4bb72efd2ec20c9f30d5c1e6f09cee3d2
author Dmitri Shuralyov <dmitshur@golang.org> 1557954804 -0400
committer Dmitri Shuralyov <dmitshur@golang.org> 1557959344 +0000

playground: format go.mod files; fix paths in formatting errors

Previously, handleFmt applied gofmt/goimports formatting to .go files
only. This change makes it apply formatting to go.mod files as well.
The cmd/go/internal/modfile package (well, a non-internal copy thereof)
is used to perform the go.mod file formatting.

Add test cases for error messages, and fix some cases where the paths
weren't accurate.

Detect when the error was returned by format.Source and needs to be
prefixed by using the fixImports variable instead of checking for the
presence of the prefix. This makes the code simpler and more readable.

Replace old fs.m[f] usage with fs.Data(f) in fmt.go and txtar_test.go.

Updates golang/go#32040
Updates golang/go#31944

Change-Id: Iefef7337f962914817558bcf0c622a952160ac44
Reviewed-on: https://go-review.googlesource.com/c/playground/+/177421
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>