feat: improve unmatched logic

Separates global excludes processing from `Formatter.Wants`. This removes redundant processing of global excludes in each `Formatter.Wants` call.

If a file has been globally excluded, we do not emit an `on-unmatched` log message. This should help reduce as reported in #317.

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

cli/cli.go

@@ -3,11 +3,12 @@ package cli
 import (
 	"os"
 
+	"github.com/gobwas/glob"
+
 	"git.numtide.com/numtide/treefmt/format"
 	"git.numtide.com/numtide/treefmt/walk"
 	"github.com/alecthomas/kong"
 	"github.com/charmbracelet/log"
-	"github.com/gobwas/glob"
 )
 
 func New() *Format {
@@ -36,8 +37,8 @@ type Format struct {
 
 	CpuProfile string `optional:"" help:"The file into which a cpu profile will be written."`
 
-	excludes   []glob.Glob
+	formatters     map[string]*format.Formatter
-	formatters map[string]*format.Formatter
+	globalExcludes []glob.Glob
 
 	filesCh     chan *walk.File
 	processedCh chan *walk.File

cli/format.go

@@ -97,7 +97,7 @@ func (f *Format) Run() (err error) {
 	}
 
 	// compile global exclude globs
-	if f.excludes, err = format.CompileGlobs(cfg.Global.Excludes); err != nil {
+	if f.globalExcludes, err = format.CompileGlobs(cfg.Global.Excludes); err != nil {
 		return fmt.Errorf("failed to compile global excludes: %w", err)
 	}
 
@@ -105,7 +105,7 @@ func (f *Format) Run() (err error) {
 	f.formatters = make(map[string]*format.Formatter)
 
 	for name, formatterCfg := range cfg.Formatters {
-		formatter, err := format.NewFormatter(name, f.TreeRoot, formatterCfg, f.excludes)
+		formatter, err := format.NewFormatter(name, f.TreeRoot, formatterCfg)
 
 		if errors.Is(err, format.ErrCommandNotFound) && f.AllowMissingFormatter {
 			log.Debugf("formatter command not found: %v", name)
@@ -390,7 +390,15 @@ func (f *Format) applyFormatters(ctx context.Context) func() error {
 		// iterate the files channel
 		for file := range f.filesCh {
 
-			// determine a list of formatters that are interested in file
+			// first check if this file has been globally excluded
+			if format.PathMatches(file.RelPath, f.globalExcludes) {
+				log.Debugf("path matched global excludes: %s", file.RelPath)
+				// mark it as processed and continue to the next
+				f.processedCh <- file
+				continue
+			}
+
+			// check if any formatters are interested in this file
 			var matches []*format.Formatter
 			for _, formatter := range f.formatters {
 				if formatter.Wants(file) {
@@ -398,11 +406,13 @@ func (f *Format) applyFormatters(ctx context.Context) func() error {
 				}
 			}
 
+			// see if any formatters matched
 			if len(matches) == 0 {
 				if f.OnUnmatched == log.FatalLevel {
-					return fmt.Errorf("no formatter for path: %s", file.Path)
+					return fmt.Errorf("no formatter for path: %s", file.RelPath)
 				}
-				log.Logf(f.OnUnmatched, "no formatter for path: %s", file.Path)
+				log.Logf(f.OnUnmatched, "no formatter for path: %s", file.RelPath)
+				// mark it as processed and continue to the next
 				f.processedCh <- file
 			} else {
 				// record the match

cli/format_test.go

@@ -39,21 +39,22 @@ func TestOnUnmatched(t *testing.T) {
 	paths := []string{
 		"go/go.mod",
 		"haskell/haskell.cabal",
-		"haskell/treefmt.toml",
 		"html/scripts/.gitkeep",
-		"nixpkgs.toml",
 		"python/requirements.txt",
-		"rust/Cargo.toml",
+		// these should not be reported as they're in the global excludes
-		"touch.toml",
+		// - "nixpkgs.toml"
-		"treefmt.toml",
+		// - "touch.toml"
+		// - "treefmt.toml"
+		// - "rust/Cargo.toml"
+		// - "haskell/treefmt.toml"
 	}
 
 	out, err := cmd(t, "-C", tempDir, "--allow-missing-formatter", "--on-unmatched", "fatal")
-	as.ErrorContains(err, fmt.Sprintf("no formatter for path: %s/%s", tempDir, paths[0]))
+	as.ErrorContains(err, fmt.Sprintf("no formatter for path: %s", paths[0]))
 
 	checkOutput := func(level string, output []byte) {
 		for _, p := range paths {
-			as.Contains(string(output), fmt.Sprintf("%s format: no formatter for path: %s/%s", level, tempDir, p))
+			as.Contains(string(output), fmt.Sprintf("%s format: no formatter for path: %s", level, p))
 		}
 	}
 

config/config_test.go

@@ -14,6 +14,8 @@ func TestReadConfigFile(t *testing.T) {
 
 	as.NotNil(cfg)
 
+	as.Equal([]string{"*.toml"}, cfg.Global.Excludes)
+
 	// python
 	python, ok := cfg.Formatters["python"]
 	as.True(ok, "python formatter not found")

format/formatter.go

@@ -100,7 +100,6 @@ func NewFormatter(
 	name string,
 	treeRoot string,
 	cfg *config.Formatter,
-	globalExcludes []glob.Glob,
 ) (*Formatter, error) {
 	var err error
 
@@ -136,7 +135,6 @@ func NewFormatter(
 	if err != nil {
 		return nil, fmt.Errorf("failed to compile formatter '%v' excludes: %w", f.name, err)
 	}
-	f.excludes = append(f.excludes, globalExcludes...)
 
 	return &f, nil
 }

nix/treefmt.nix

@@ -22,33 +22,32 @@
         statix.enable = true;
       };
 
-      settings.formatter = {
+      settings = {
-        deadnix = {
+        global.excludes = [
-          priority = 1;
+          "LICENSE"
-        };
+          # let's not mess with the test folder
+          "test/**"
+          # unsupported extensions
+          "*.{gif,png,svg,tape,mts,lock,mod,sum,toml,env,envrc,gitignore}"
+        ];
 
-        statix = {
+        formatter = {
-          priority = 2;
+          deadnix = {
-        };
+            priority = 1;
+          };
 
-        alejandra = {
+          statix = {
-          priority = 3;
+            priority = 2;
-        };
+          };
 
-        prettier = {
+          alejandra = {
-          options = ["--tab-width" "4"];
+            priority = 3;
-          includes = [
+          };
-            "*.css"
+
-            "*.html"
+          prettier = {
-            "*.js"
+            options = ["--tab-width" "4"];
-            "*.json"
+            includes = ["*.{css,html,js,json,jsx,md,mdx,scss,ts,yaml}"];
-            "*.jsx"
+          };
-            "*.md"
-            "*.mdx"
-            "*.scss"
-            "*.ts"
-            "*.yaml"
-          ];
         };
       };
     };

test/examples/treefmt.toml

@@ -1,5 +1,8 @@
 # One CLI to format the code tree - https://git.numtide.com/numtide/treefmt
 
+[global]
+excludes = ["*.toml"]
+
 [formatter.python]
 command = "black"
 includes = ["*.py"]