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Add support for preview window header

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Fix #2373

  # Display top 3 lines as the fixed header
  fzf --preview 'bat --style=header,grid --color=always {}' --preview-window '~3'
This commit is contained in:
Junegunn Choi
2021-03-12 19:51:28 +09:00
parent 7310370a31
commit 4c4c6e626e
5 changed files with 87 additions and 29 deletions
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44
src/terminal.go
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@@ -1295,18 +1295,37 @@ func (t *Terminal) renderPreviewSpinner() {
}
}
func (t *Terminal) renderPreviewText(unchanged bool) {
maxWidth := t.pwindow.Width()
lineNo := -t.previewer.offset
height := t.pwindow.Height()
func (t *Terminal) renderPreviewArea(unchanged bool) {
if unchanged {
t.pwindow.MoveAndClear(0, 0)
t.pwindow.MoveAndClear(0, 0) // Clear scroll offset display
} else {
t.previewed.filled = false
t.pwindow.Erase()
}
height := t.pwindow.Height()
header := []string{}
body := t.previewer.lines
headerLines := t.previewOpts.headerLines
// Do not enable preview header lines if it's value is too large
if headerLines > 0 && headerLines < util.Min(len(body), height) {
header = t.previewer.lines[0:headerLines]
body = t.previewer.lines[headerLines:]
// Always redraw header
t.renderPreviewText(height, header, 0, false)
t.pwindow.MoveAndClear(t.pwindow.Y(), 0)
}
t.renderPreviewText(height, body, -t.previewer.offset+headerLines, unchanged)
if !unchanged {
t.pwindow.FinishFill()
}
}
func (t *Terminal) renderPreviewText(height int, lines []string, lineNo int, unchanged bool) {
maxWidth := t.pwindow.Width()
var ansi *ansiState
for _, line := range t.previewer.lines {
for _, line := range lines {
var lbg tui.Color = -1
if ansi != nil {
ansi.lbg = -1
@@ -1354,9 +1373,6 @@ func (t *Terminal) renderPreviewText(unchanged bool) {
}
lineNo++
}
if !unchanged {
t.pwindow.FinishFill()
}
}
func (t *Terminal) printPreview() {
@@ -1369,7 +1385,7 @@ func (t *Terminal) printPreview() {
t.previewer.version == t.previewed.version &&
t.previewer.offset == t.previewed.offset
t.previewer.scrollable = t.previewer.offset > 0 || numLines > height
t.renderPreviewText(unchanged)
t.renderPreviewArea(unchanged)
t.renderPreviewSpinner()
t.previewed.numLines = numLines
t.previewed.version = t.previewer.version
@@ -1382,7 +1398,7 @@ func (t *Terminal) printPreviewDelayed() {
}
t.previewer.scrollable = false
t.renderPreviewText(true)
t.renderPreviewArea(true)
message := t.trimMessage("Loading ..", t.pwindow.Width())
pos := t.pwindow.Width() - len(message)
@@ -1929,7 +1945,7 @@ func (t *Terminal) Loop() {
cmd := util.ExecCommand(command, true)
if pwindow != nil {
height := pwindow.Height()
initialOffset = util.Max(0, t.evaluateScrollOffset(items, height))
initialOffset = util.Max(0, t.evaluateScrollOffset(items, util.Max(0, height-t.previewOpts.headerLines)))
env := os.Environ()
lines := fmt.Sprintf("LINES=%d", height)
columns := fmt.Sprintf("COLUMNS=%d", pwindow.Width())
@@ -2132,7 +2148,7 @@ func (t *Terminal) Loop() {
if t.previewer.following {
t.previewer.offset = len(t.previewer.lines) - t.pwindow.Height()
} else if result.offset >= 0 {
t.previewer.offset = util.Constrain(result.offset, 0, len(t.previewer.lines)-1)
t.previewer.offset = util.Constrain(result.offset, t.previewOpts.headerLines, len(t.previewer.lines)-1)
}
t.printPreview()
case reqPreviewRefresh:
@@ -2205,7 +2221,7 @@ func (t *Terminal) Loop() {
if t.previewOpts.cycle {
newOffset = (newOffset + numLines) % numLines
}
newOffset = util.Constrain(newOffset, 0, numLines-1)
newOffset = util.Constrain(newOffset, t.previewOpts.headerLines, numLines-1)
if t.previewer.offset != newOffset {
t.previewer.offset = newOffset
req(reqPreviewRefresh)