fix: duplicate processing in ordered formatters (#24)

Fixes a bug with formatters processing paths out of order.

Signed-off-by: Brian McGee <brian@bmcgee.ie>

Reviewed-on: https://git.numtide.com/numtide/treefmt/pulls/24
Co-authored-by: Brian McGee <brian@bmcgee.ie>
Co-committed-by: Brian McGee <brian@bmcgee.ie>

internal/cli/format_test.go

@@ -57,7 +57,7 @@ func TestDependencyCycle(t *testing.T) {
 	})
 
 	_, err := cmd(t, "--config-file", configPath, "--tree-root", tempDir)
-	as.ErrorContains(err, "formatter cycle detected a -> b -> c")
+	as.ErrorContains(err, "formatter cycle detected")
 }
 
 func TestSpecifyingFormatters(t *testing.T) {

internal/format/format.go

@@ -122,6 +122,10 @@ func (f *Formatter) SetChild(formatter *Formatter) {
 // Wants is used to test if a Formatter wants path based on it's configured Includes and Excludes patterns.
 // Returns true if the Formatter should be applied to path, false otherwise.
 func (f *Formatter) Wants(path string) bool {
+	if f.parent != nil {
+		// we don't accept this path directly, our parent will forward it
+		return false
+	}
 	match := !PathMatches(path, f.excludes) && PathMatches(path, f.includes)
 	if match {
 		f.log.Debugf("match: %v", path)

internal/walk/git.go

@@ -3,9 +3,10 @@ package walk
 import (
 	"context"
 	"fmt"
-	"github.com/go-git/go-git/v5"
 	"os"
 	"path/filepath"
+
+	"github.com/go-git/go-git/v5"
 )
 
 type gitWalker struct {
@@ -18,14 +19,12 @@ func (g *gitWalker) Root() string {
 }
 
 func (g *gitWalker) Walk(ctx context.Context, fn filepath.WalkFunc) error {
-
 	idx, err := g.repo.Storer.Index()
 	if err != nil {
 		return fmt.Errorf("%w: failed to open index", err)
 	}
 
 	for _, entry := range idx.Entries {
-
 		select {
 		case <-ctx.Done():
 			return ctx.Err()
@@ -38,7 +37,6 @@ func (g *gitWalker) Walk(ctx context.Context, fn filepath.WalkFunc) error {
 				return err
 			}
 		}
-
 	}
 
 	return nil

nix/packages.nix

@@ -28,7 +28,7 @@
 
         nativeBuildInputs =
           # we need some formatters available for the tests
-          (import ./formatters.nix pkgs);
+          import ./formatters.nix pkgs;
 
         preCheck = ''
           XDG_CACHE_HOME=$(mktemp -d)