Allow customizing --ghost color via '--color ghost'

Examples:

  # Dimmed red
  fzf --ghost booya --color ghost:red

  # Regular red
  fzf --ghost booya --color ghost:red:regular

Close #4398

man/man1/fzf.1

@@ -272,6 +272,7 @@ color mappings. Each entry is separated by a comma and/or whitespaces.
     \fBcurrent\-hl (hl+)      \fRHighlighted substrings (current line)
     \fBalt\-bg                \fRAlternate background color to create striped lines
     \fBquery (input\-fg)      \fRQuery string
+      \fBghost               \fRGhost text (\fB\-\-ghost\fR, \fBdim\fR applied by default)
       \fBdisabled            \fRQuery string when search is disabled (\fB\-\-disabled\fR)
     \fBinfo                  \fRInfo line (match counters)
     \fBborder                \fRBorder around the window (\fB\-\-border\fR and \fB\-\-preview\fR)

src/options.go

@@ -1282,6 +1282,8 @@ func parseTheme(defaultTheme *tui.ColorTheme, str string) (*tui.ColorTheme, erro
 			switch components[0] {
 			case "query", "input", "input-fg":
 				mergeAttr(&theme.Input)
+			case "ghost":
+				mergeAttr(&theme.Ghost)
 			case "disabled":
 				mergeAttr(&theme.Disabled)
 			case "fg":

src/terminal.go

@@ -2386,7 +2386,7 @@ func (t *Terminal) printPrompt() {
 
 	before, after := t.updatePromptOffset()
 	if len(before) == 0 && len(after) == 0 && len(t.ghost) > 0 {
-		w.CPrint(tui.ColInput.WithAttr(tui.Dim), t.ghost)
+		w.CPrint(tui.ColGhost, t.ghost)
 		return
 	}
 

src/tui/tui.go

@@ -329,6 +329,7 @@ func (p ColorPair) MergeNonDefault(other ColorPair) ColorPair {
 type ColorTheme struct {
 	Colored          bool
 	Input            ColorAttr
+	Ghost            ColorAttr
 	Disabled         ColorAttr
 	Fg               ColorAttr
 	Bg               ColorAttr
@@ -701,6 +702,7 @@ var (
 	ColNormal               ColorPair
 	ColInput                ColorPair
 	ColDisabled             ColorPair
+	ColGhost                ColorPair
 	ColMatch                ColorPair
 	ColCursor               ColorPair
 	ColCursorEmpty          ColorPair
@@ -760,6 +762,7 @@ func EmptyTheme() *ColorTheme {
 		BorderLabel:      ColorAttr{colUndefined, AttrUndefined},
 		ListLabel:        ColorAttr{colUndefined, AttrUndefined},
 		ListBorder:       ColorAttr{colUndefined, AttrUndefined},
+		Ghost:            ColorAttr{colUndefined, Dim},
 		Disabled:         ColorAttr{colUndefined, AttrUndefined},
 		PreviewFg:        ColorAttr{colUndefined, AttrUndefined},
 		PreviewBg:        ColorAttr{colUndefined, AttrUndefined},
@@ -804,6 +807,7 @@ func NoColorTheme() *ColorTheme {
 		Header:           ColorAttr{colDefault, AttrUndefined},
 		Border:           ColorAttr{colDefault, AttrUndefined},
 		BorderLabel:      ColorAttr{colDefault, AttrUndefined},
+		Ghost:            ColorAttr{colDefault, Dim},
 		Disabled:         ColorAttr{colDefault, AttrUndefined},
 		PreviewFg:        ColorAttr{colDefault, AttrUndefined},
 		PreviewBg:        ColorAttr{colDefault, AttrUndefined},
@@ -850,6 +854,7 @@ func init() {
 		Header:           ColorAttr{colCyan, AttrUndefined},
 		Border:           ColorAttr{colBlack, AttrUndefined},
 		BorderLabel:      ColorAttr{colWhite, AttrUndefined},
+		Ghost:            ColorAttr{colUndefined, Dim},
 		Disabled:         ColorAttr{colUndefined, AttrUndefined},
 		PreviewFg:        ColorAttr{colUndefined, AttrUndefined},
 		PreviewBg:        ColorAttr{colUndefined, AttrUndefined},
@@ -890,6 +895,7 @@ func init() {
 		Header:           ColorAttr{109, AttrUndefined},
 		Border:           ColorAttr{59, AttrUndefined},
 		BorderLabel:      ColorAttr{145, AttrUndefined},
+		Ghost:            ColorAttr{colUndefined, Dim},
 		Disabled:         ColorAttr{colUndefined, AttrUndefined},
 		PreviewFg:        ColorAttr{colUndefined, AttrUndefined},
 		PreviewBg:        ColorAttr{colUndefined, AttrUndefined},
@@ -930,6 +936,7 @@ func init() {
 		Header:           ColorAttr{31, AttrUndefined},
 		Border:           ColorAttr{145, AttrUndefined},
 		BorderLabel:      ColorAttr{59, AttrUndefined},
+		Ghost:            ColorAttr{colUndefined, Dim},
 		Disabled:         ColorAttr{colUndefined, AttrUndefined},
 		PreviewFg:        ColorAttr{colUndefined, AttrUndefined},
 		PreviewBg:        ColorAttr{colUndefined, AttrUndefined},
@@ -995,6 +1002,7 @@ func InitTheme(theme *ColorTheme, baseTheme *ColorTheme, forceBlack bool, hasInp
 	theme.SelectedFg = o(theme.ListFg, theme.SelectedFg)
 	theme.SelectedBg = o(theme.ListBg, theme.SelectedBg)
 	theme.SelectedMatch = o(theme.Match, theme.SelectedMatch)
+	theme.Ghost = o(theme.Input, theme.Ghost)
 	theme.Disabled = o(theme.Input, theme.Disabled)
 	theme.Gutter = o(theme.DarkBg, theme.Gutter)
 	theme.PreviewFg = o(theme.Fg, theme.PreviewFg)
@@ -1051,6 +1059,7 @@ func initPalette(theme *ColorTheme) {
 	ColNormal = pair(theme.ListFg, theme.ListBg)
 	ColSelected = pair(theme.SelectedFg, theme.SelectedBg)
 	ColInput = pair(theme.Input, theme.InputBg)
+	ColGhost = pair(theme.Ghost, theme.InputBg)
 	ColDisabled = pair(theme.Disabled, theme.InputBg)
 	ColMatch = pair(theme.Match, theme.ListBg)
 	ColSelectedMatch = pair(theme.SelectedMatch, theme.SelectedBg)