Return Composer dependency trees as JSON and detect CLI versions

composer_test.go

@@ -0,0 +1,59 @@
+package managers
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+func TestComposerResolve(t *testing.T) {
+	runner := NewMockRunner()
+	detector := NewDetector(NewTranslator(), runner)
+	detector.Register(embeddedDef(t, "composer"))
+	mgr, err := detector.Detect(t.TempDir(), DetectOptions{Manager: "composer"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := mgr.Resolve(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"composer", "show", "--tree", "--format=json"}
+	if len(runner.Captured) != 1 || !slicesEqual(runner.Captured[0], want) {
+		t.Errorf("commands = %v, want [%v]", runner.Captured, want)
+	}
+}
+
+func TestComposerDetectVersion(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("requires a POSIX shell")
+	}
+	def := embeddedDef(t, "composer")
+	def.Binary = filepath.Join(t.TempDir(), "composer")
+	script := "#!/bin/sh\n[ \"$#\" = 1 ] && [ \"$1\" = --version ] || exit 1\nprintf '%s\\n' \"$COMPOSER_TEST_OUTPUT\"\n"
+	if err := os.WriteFile(def.Binary, []byte(script), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	detector := NewDetector(NewTranslator(), NewMockRunner())
+	tests := []struct {
+		output string
+		want   string
+	}{
+		{"Composer version 2.10.3 2026-08-27 13:34:23", "2.10.3"},
+		{"Composer version 2.10.0-RC2 2026-05-20 11:00:00", "2.10.0-RC2"},
+		{"Composer version 2.11.999-dev+source", "2.11.999-dev+source"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.want, func(t *testing.T) {
+			t.Setenv("COMPOSER_TEST_OUTPUT", tt.output)
+			version, err := detector.DetectVersion(def)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if version != tt.want {
+				t.Errorf("version = %q, want %q", version, tt.want)
+			}
+		})
+	}
+}

definitions/composer.yaml

@@ -16,6 +16,10 @@ detection:
     - composer.json
   priority: 10
 
+version_detection:
+  command: [--version]
+  pattern: '^Composer version (\S+)'
+
 commands:
   init:
     base: [init, -n]
@@ -92,7 +96,7 @@ commands:
 
   resolve:
     base: [show]
-    default_flags: [--tree]
+    default_flags: [--tree, --format=json]
     exit_codes:
       0: success
       1: error