add path shortening algorithm in case the current file browser path doesn't fit in the title

Author: markusressel

internal/ui/file_browser/file_browser.go

@@ -485,7 +485,22 @@ func (fileBrowser *FileBrowserComponent) SetSelectedSnapshot(snapshot *data.Snap
 
 func (fileBrowser *FileBrowserComponent) Refresh() {
 	fileBrowser.showMessage(status_message.NewInfoStatusMessage("Refreshing..."))
-	title := fmt.Sprintf("Path: %s", fileBrowser.path)
+
+	_, _, width, _ := fileBrowser.tableContainer.GetLayout().GetRect()
+	if width == 0 {
+		width = 80
+	}
+	// title is " Path: Path: <path> "
+	// theme.CreateTitleText adds 2 spaces.
+	// Box adds borders (2 chars).
+	// "Path: " is 6 chars.
+	// So available is width - 2 (borders) - 2 (spaces) - 6 (prefix) = width - 10.
+	maxWidth := width - 10
+	if maxWidth < 20 {
+		maxWidth = 20
+	}
+
+	title := fmt.Sprintf("Path: %s", fileBrowser.truncatePath(fileBrowser.path, maxWidth))
 	fileBrowser.tableContainer.SetTitle(title)
 
 	entries, err := fileBrowser.computeTableEntries()
@@ -499,6 +514,48 @@ func (fileBrowser *FileBrowserComponent) Refresh() {
 	fileBrowser.showMessage(status_message.NewInfoStatusMessage(""))
 }
 
+func (fileBrowser *FileBrowserComponent) truncatePath(path string, maxWidth int) string {
+	if len([]rune(path)) <= maxWidth {
+		return path
+	}
+
+	separator := string(os.PathSeparator)
+	parts := strings.Split(path, separator)
+
+	if len(parts) <= 1 {
+		runes := []rune(path)
+		if len(runes) > maxWidth && maxWidth > 3 {
+			return "..." + string(runes[len(runes)-maxWidth+3:])
+		}
+		return path
+	}
+
+	// Try shortening parts from left to right, except the last one
+	for i := 0; i < len(parts)-1; i++ {
+		if parts[i] == "" || parts[i] == "." || parts[i] == ".." {
+			continue
+		}
+
+		runes := []rune(parts[i])
+		if len(runes) > 1 {
+			parts[i] = string(runes[0]) + "…"
+			newPath := strings.Join(parts, separator)
+			if len([]rune(newPath)) <= maxWidth {
+				return newPath
+			}
+		}
+	}
+
+	// If still too long, truncate the resulting path with ellipsis at the beginning
+	finalPath := strings.Join(parts, separator)
+	finalRunes := []rune(finalPath)
+	if len(finalRunes) > maxWidth && maxWidth > 3 {
+		return "..." + string(finalRunes[len(finalRunes)-maxWidth+3:])
+	}
+
+	return finalPath
+}
+
 func (fileBrowser *FileBrowserComponent) selectFileEntry(newSelection *data.FileBrowserEntry) {
 	if fileBrowser.GetSelection() == newSelection || (fileBrowser.GetSelection() != nil && newSelection != nil && fileBrowser.GetSelection().GetRealPath() == newSelection.GetRealPath()) {
 		return

internal/ui/file_browser/file_browser_path_test.go

@@ -0,0 +1,63 @@
+package file_browser
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestTruncatePath(t *testing.T) {
+	fb := &FileBrowserComponent{}
+	sep := string(os.PathSeparator)
+
+	tests := []struct {
+		name     string
+		path     string
+		maxWidth int
+		want     string
+	}{
+		{
+			name:     "Short path, no truncation",
+			path:     "/home/user",
+			maxWidth: 20,
+			want:     "/home/user",
+		},
+		{
+			name:     "Long path, shorten components",
+			path:     "/home/markus/projects/zfs-file-history",
+			maxWidth: 25,
+			want:     "...m…/p…/zfs-file-history",
+		},
+		{
+			name:     "Very long path, shorten components and ellipsis",
+			path:     "/home/markus/projects/zfs-file-history",
+			maxWidth: 15,
+			want:     "...file-history",
+		},
+		{
+			name:     "Long path, shortening fits exactly",
+			path:     "/home/markus/projects/zfs-file-history",
+			maxWidth: 26,
+			want:     "/h…/m…/p…/zfs-file-history",
+		},
+		{
+			name:     "Path with empty components (leading slash)",
+			path:     "/a/b/c/d/e/f/g/h",
+			maxWidth: 10,
+			want:     "...e/f/g/h",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// replace / with os.PathSeparator in test cases for cross-platform
+			path := strings.ReplaceAll(tt.path, "/", sep)
+			want := strings.ReplaceAll(tt.want, "/", sep)
+
+			got := fb.truncatePath(path, tt.maxWidth)
+			if got != want {
+				t.Errorf("truncatePath() = %v, want %v", got, want)
+			}
+		})
+	}
+}