feat(tui): interactive diff view with unified/side-by-side/plain modes

cmd/mxcli/cmd_tui.go

@@ -59,6 +59,7 @@ Example:
 
 		m := tui.NewApp(mxcliPath, projectPath)
 		p := tea.NewProgram(m, tea.WithAltScreen(), tea.WithMouseCellMotion())
+		m.StartWatcher(p)
 		if _, err := p.Run(); err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 			os.Exit(1)

cmd/mxcli/docker/build.go

@@ -90,7 +90,7 @@ func Build(opts BuildOptions) error {
 	// Step 4: Pre-build check
 	if !opts.SkipCheck {
 		fmt.Fprintln(w, "Checking project for errors...")
-		mxPath, err := resolveMx(opts.MxBuildPath)
+		mxPath, err := ResolveMx(opts.MxBuildPath)
 		if err != nil {
 			fmt.Fprintf(w, "  Skipping check: %v\n", err)
 		} else {

cmd/mxcli/docker/check.go

@@ -39,7 +39,7 @@ func Check(opts CheckOptions) error {
 	}
 
 	// Resolve mx binary
-	mxPath, err := resolveMx(opts.MxBuildPath)
+	mxPath, err := ResolveMx(opts.MxBuildPath)
 	if err != nil {
 		return err
 	}
@@ -67,9 +67,9 @@ func mxBinaryName() string {
 	return "mx"
 }
 
-// resolveMx finds the mx executable.
+// ResolveMx finds the mx executable.
 // Priority: derive from mxbuild path > PATH lookup.
-func resolveMx(mxbuildPath string) (string, error) {
+func ResolveMx(mxbuildPath string) (string, error) {
 	if mxbuildPath != "" {
 		// Resolve mxbuild first to handle directory paths
 		resolvedMxBuild, err := resolveMxBuild(mxbuildPath)
@@ -102,5 +102,16 @@ func resolveMx(mxbuildPath string) (string, error) {
 		return p, nil
 	}
 
+	// Try cached mxbuild installations (~/.mxcli/mxbuild/*/modeler/mx).
+	// NOTE: lexicographic sort is imperfect for versions (e.g. "9.x" > "10.x"),
+	// but this is a fallback-of-last-resort — in practice users typically have
+	// only one mxbuild version installed.
+	if home, err := os.UserHomeDir(); err == nil {
+		matches, _ := filepath.Glob(filepath.Join(home, ".mxcli", "mxbuild", "*", "modeler", mxBinaryName()))
+		if len(matches) > 0 {
+			return matches[len(matches)-1], nil
+		}
+	}
+
 	return "", fmt.Errorf("mx not found; specify --mxbuild-path pointing to Mendix installation directory")
 }