// DisplayView renders the view to the screen
func (v *View) DisplayView() {
-
- // The character number of the character in the top left of the screen
+ // The charNum we are currently displaying
+ // starts at the start of the viewport
charNum := Loc{0, v.Topline}
// Convert the length of buffer to a string, and get the length of the string
// We are going to have to offset by that amount
maxLineLength := len(strconv.Itoa(v.Buf.NumLines))
- // + 1 for the little space after the line number
+
if settings["ruler"] == true {
+ // + 1 for the little space after the line number
v.lineNumOffset = maxLineLength + 1
} else {
v.lineNumOffset = 0
}
- highlightStyle := defStyle
+ // We need to add to the line offset if there are gutter messages
var hasGutterMessages bool
for _, v := range v.messages {
if len(v) > 0 {
v.lineNumOffset++
}
- for lineN := 0; lineN < v.height; lineN++ {
- x := v.x
+ // These represent the current screen coordinates
+ screenX, screenY := 0, 0
+
+ highlightStyle := defStyle
+
+ // ViewLine is the current line from the top of the viewport
+ for viewLine := 0; viewLine < v.height; viewLine++ {
+ screenY = v.y + viewLine
+ screenX = v.x
+
+ // This is the current line number of the buffer that we are drawing
+ curLineN := viewLine + v.Topline
+
if v.x != 0 {
// Draw the split divider
- v.drawCell(x, lineN+v.y, ' ', nil, defStyle.Reverse(true))
- x++
+ v.drawCell(screenX, screenY, ' ', nil, defStyle.Reverse(true))
+ screenX++
}
- // If the buffer is smaller than the view height
- if lineN+v.Topline >= v.Buf.NumLines {
- // We have to clear all this space
- for i := x; i < v.x+v.width; i++ {
- v.drawCell(i, lineN+v.y, ' ', nil, defStyle)
+
+ // If the buffer is smaller than the view height we have to clear all this space
+ if curLineN >= v.Buf.NumLines {
+ for i := screenX; i < v.x+v.width; i++ {
+ v.drawCell(i, screenY, ' ', nil, defStyle)
}
continue
}
- line := v.Buf.Line(lineN + v.Topline)
+ line := v.Buf.Line(curLineN)
+ // If there are gutter messages we need to display the '>>' symbol here
if hasGutterMessages {
+ // msgOnLine stores whether or not there is a gutter message on this line in particular
msgOnLine := false
for k := range v.messages {
for _, msg := range v.messages[k] {
- if msg.lineNum == lineN+v.Topline {
+ if msg.lineNum == curLineN {
msgOnLine = true
gutterStyle := defStyle
switch msg.kind {
gutterStyle = style
}
}
- v.drawCell(x, lineN+v.y, '>', nil, gutterStyle)
- x++
- v.drawCell(x, lineN+v.y, '>', nil, gutterStyle)
- x++
- if v.Cursor.Y == lineN+v.Topline {
+ v.drawCell(screenX, screenY, '>', nil, gutterStyle)
+ screenX++
+ v.drawCell(screenX, screenY, '>', nil, gutterStyle)
+ screenX++
+ if v.Cursor.Y == curLineN {
messenger.Message(msg.msg)
messenger.gutterMessage = true
}
}
}
}
+ // If there is no message on this line we just display an empty offset
if !msgOnLine {
- v.drawCell(x, lineN+v.y, ' ', nil, defStyle)
- x++
- v.drawCell(x, lineN+v.y, ' ', nil, defStyle)
- x++
- if v.Cursor.Y == lineN+v.Topline && messenger.gutterMessage {
+ v.drawCell(screenX, screenY, ' ', nil, defStyle)
+ screenX++
+ v.drawCell(screenX, screenY, ' ', nil, defStyle)
+ screenX++
+ if v.Cursor.Y == curLineN && messenger.gutterMessage {
messenger.Reset()
messenger.gutterMessage = false
}
}
}
- // Write the line number
- lineNumStyle := defStyle
- if style, ok := colorscheme["line-number"]; ok {
- lineNumStyle = style
- }
- // Write the spaces before the line number if necessary
- var lineNum string
if settings["ruler"] == true {
- lineNum = strconv.Itoa(lineN + v.Topline + 1)
+ // Write the line number
+ lineNumStyle := defStyle
+ if style, ok := colorscheme["line-number"]; ok {
+ lineNumStyle = style
+ }
+
+ lineNum := strconv.Itoa(curLineN + 1)
+
+ // Write the spaces before the line number if necessary
for i := 0; i < maxLineLength-len(lineNum); i++ {
- v.drawCell(x, lineN+v.y, ' ', nil, lineNumStyle)
- x++
+ v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
+ screenX++
}
// Write the actual line number
for _, ch := range lineNum {
- v.drawCell(x, lineN+v.y, ch, nil, lineNumStyle)
- x++
+ v.drawCell(screenX, screenY, ch, nil, lineNumStyle)
+ screenX++
}
- if settings["ruler"] == true {
- // Write the extra space
- v.drawCell(x, lineN+v.y, ' ', nil, lineNumStyle)
- x++
- }
+ // Write the extra space
+ v.drawCell(screenX, screenY, ' ', nil, lineNumStyle)
+ screenX++
}
- // Write the line
+
+ // Now we actually draw the line
for colN, ch := range line {
lineStyle := defStyle
if settings["syntax"].(bool) {
// Syntax highlighting is enabled
- highlightStyle = v.matches[lineN][colN]
+ highlightStyle = v.matches[viewLine][colN]
}
if v.Cursor.HasSelection() &&
(charNum.GreaterEqual(v.Cursor.CurSelection[0]) && charNum.LessThan(v.Cursor.CurSelection[1]) ||
charNum.LessThan(v.Cursor.CurSelection[0]) && charNum.GreaterEqual(v.Cursor.CurSelection[1])) {
-
+ // The current character is selected
lineStyle = defStyle.Reverse(true)
if style, ok := colorscheme["selection"]; ok {
lineStyle = highlightStyle
}
- if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
+ // We need to display the background of the linestyle with the correct color if cursorline is enabled
+ // and this is the current view and there is no selection on this line and the cursor is on this line
+ if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
if style, ok := colorscheme["cursor-line"]; ok {
fg, _, _ := style.Decompose()
lineStyle = lineStyle.Background(fg)
}
if ch == '\t' {
+ // If the character we are displaying is a tab, we need to do a bunch of special things
+
+ // First the user may have configured an `indent-char` to be displayed to show that this
+ // is a tab character
lineIndentStyle := defStyle
if style, ok := colorscheme["indent-char"]; ok {
lineIndentStyle = style
lineIndentStyle = style
}
}
- if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
+ if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
if style, ok := colorscheme["cursor-line"]; ok {
fg, _, _ := style.Decompose()
lineIndentStyle = lineIndentStyle.Background(fg)
}
}
+ // Here we get the indent char
indentChar := []rune(settings["indentchar"].(string))
- if x-v.leftCol >= v.lineNumOffset {
- v.drawCell(x-v.leftCol, lineN+v.y, indentChar[0], nil, lineIndentStyle)
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX-v.leftCol, screenY, indentChar[0], nil, lineIndentStyle)
}
+ // Now the tab has to be displayed as a bunch of spaces
tabSize := int(settings["tabsize"].(float64))
for i := 0; i < tabSize-1; i++ {
- x++
- if x-v.leftCol >= v.lineNumOffset {
- v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, lineStyle)
+ screenX++
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX-v.leftCol, screenY, ' ', nil, lineStyle)
}
}
} else if runewidth.RuneWidth(ch) > 1 {
- if x-v.leftCol >= v.lineNumOffset {
- v.drawCell(x-v.leftCol, lineN+v.y, ch, nil, lineStyle)
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX, screenY, ch, nil, lineStyle)
}
for i := 0; i < runewidth.RuneWidth(ch)-1; i++ {
- x++
- if x-v.leftCol >= v.lineNumOffset {
- v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, lineStyle)
+ screenX++
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX-v.leftCol, screenY, '<', nil, lineStyle)
}
}
} else {
- if x-v.leftCol >= v.lineNumOffset {
- v.drawCell(x-v.leftCol, lineN+v.y, ch, nil, lineStyle)
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX-v.leftCol, screenY, ch, nil, lineStyle)
}
}
charNum = charNum.Move(1, v.Buf)
- x++
+ screenX++
}
// Here we are at a newline
if style, ok := colorscheme["selection"]; ok {
selectStyle = style
}
- v.drawCell(x-v.leftCol, lineN+v.y, ' ', nil, selectStyle)
- x++
+ v.drawCell(screenX, screenY, ' ', nil, selectStyle)
+ screenX++
}
charNum = charNum.Move(1, v.Buf)
- for i := 0; i < v.width-((x-v.x)-v.leftCol); i++ {
+ for i := 0; i < v.width; i++ {
lineStyle := defStyle
- if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == lineN+v.Topline {
+ if settings["cursorline"].(bool) && tabs[curTab].curView == v.Num && !v.Cursor.HasSelection() && v.Cursor.Y == curLineN {
if style, ok := colorscheme["cursor-line"]; ok {
fg, _, _ := style.Decompose()
lineStyle = lineStyle.Background(fg)
}
}
- if !(x-v.leftCol < v.lineNumOffset) {
- v.drawCell(x+i, lineN+v.y, ' ', nil, lineStyle)
+ if screenX-v.x-v.leftCol >= v.lineNumOffset {
+ v.drawCell(screenX-v.leftCol+i, screenY, ' ', nil, lineStyle)
}
}
}
projects / micro.git / blobdiff