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lazygit/pkg/gui/lbl/state.go
2022-05-07 16:02:04 +10:00

206 lines
4.8 KiB
Go

package lbl
import (
"github.com/jesseduffield/lazygit/pkg/commands/patch"
"github.com/sirupsen/logrus"
)
// State represents the current state of the line-by-line context i.e. when
// you're staging a file line-by-line or you're building a patch from an existing commit
// this struct holds the info about the diff you're interacting with and what's currently selected.
type State struct {
selectedLineIdx int
rangeStartLineIdx int
diff string
patchParser *patch.PatchParser
selectMode selectMode
}
// these represent what select mode we're in
type selectMode int
const (
LINE selectMode = iota
RANGE
HUNK
)
func NewState(diff string, selectedLineIdx int, oldState *State, log *logrus.Entry) *State {
patchParser := patch.NewPatchParser(log, diff)
if len(patchParser.StageableLines) == 0 {
return nil
}
rangeStartLineIdx := 0
if oldState != nil {
rangeStartLineIdx = oldState.rangeStartLineIdx
}
selectMode := LINE
// if we have clicked from the outside to focus the main view we'll pass in a non-negative line index so that we can instantly select that line
if selectedLineIdx >= 0 {
selectMode = RANGE
rangeStartLineIdx = selectedLineIdx
} else if oldState != nil {
// if we previously had a selectMode of RANGE, we want that to now be line again
if oldState.selectMode == HUNK {
selectMode = HUNK
}
selectedLineIdx = patchParser.GetNextStageableLineIndex(oldState.selectedLineIdx)
} else {
selectedLineIdx = patchParser.StageableLines[0]
}
return &State{
patchParser: patchParser,
selectedLineIdx: selectedLineIdx,
selectMode: selectMode,
rangeStartLineIdx: rangeStartLineIdx,
diff: diff,
}
}
func (s *State) GetSelectedLineIdx() int {
return s.selectedLineIdx
}
func (s *State) GetDiff() string {
return s.diff
}
func (s *State) ToggleSelectHunk() {
if s.selectMode == HUNK {
s.selectMode = LINE
} else {
s.selectMode = HUNK
}
}
func (s *State) ToggleSelectRange() {
if s.selectMode == RANGE {
s.selectMode = LINE
} else {
s.selectMode = RANGE
s.rangeStartLineIdx = s.selectedLineIdx
}
}
func (s *State) SelectingHunk() bool {
return s.selectMode == HUNK
}
func (s *State) SelectingRange() bool {
return s.selectMode == RANGE
}
func (s *State) SelectingLine() bool {
return s.selectMode == LINE
}
func (s *State) SetLineSelectMode() {
s.selectMode = LINE
}
func (s *State) SelectLine(newSelectedLineIdx int) {
if newSelectedLineIdx < 0 {
newSelectedLineIdx = 0
} else if newSelectedLineIdx > len(s.patchParser.PatchLines)-1 {
newSelectedLineIdx = len(s.patchParser.PatchLines) - 1
}
s.selectedLineIdx = newSelectedLineIdx
}
func (s *State) SelectNewLineForRange(newSelectedLineIdx int) {
s.rangeStartLineIdx = newSelectedLineIdx
s.selectMode = RANGE
s.SelectLine(newSelectedLineIdx)
}
func (s *State) CycleSelection(forward bool) {
if s.SelectingHunk() {
s.CycleHunk(forward)
} else {
s.CycleLine(forward)
}
}
func (s *State) CycleHunk(forward bool) {
change := 1
if !forward {
change = -1
}
newHunk := s.patchParser.GetHunkContainingLine(s.selectedLineIdx, change)
s.selectedLineIdx = s.patchParser.GetNextStageableLineIndex(newHunk.FirstLineIdx)
}
func (s *State) CycleLine(forward bool) {
change := 1
if !forward {
change = -1
}
s.SelectLine(s.selectedLineIdx + change)
}
func (s *State) CurrentHunk() *patch.PatchHunk {
return s.patchParser.GetHunkContainingLine(s.selectedLineIdx, 0)
}
func (s *State) SelectedRange() (int, int) {
switch s.selectMode {
case HUNK:
hunk := s.CurrentHunk()
return hunk.FirstLineIdx, hunk.LastLineIdx()
case RANGE:
if s.rangeStartLineIdx > s.selectedLineIdx {
return s.selectedLineIdx, s.rangeStartLineIdx
} else {
return s.rangeStartLineIdx, s.selectedLineIdx
}
case LINE:
return s.selectedLineIdx, s.selectedLineIdx
default:
// should never happen
return 0, 0
}
}
func (s *State) CurrentLineNumber() int {
return s.CurrentHunk().LineNumberOfLine(s.selectedLineIdx)
}
func (s *State) AdjustSelectedLineIdx(change int) {
s.SelectLine(s.selectedLineIdx + change)
}
func (s *State) RenderForLineIndices(includedLineIndices []int) string {
firstLineIdx, lastLineIdx := s.SelectedRange()
return s.patchParser.Render(firstLineIdx, lastLineIdx, includedLineIndices)
}
func (s *State) PlainRenderSelected() string {
firstLineIdx, lastLineIdx := s.SelectedRange()
return s.patchParser.PlainRenderLines(firstLineIdx, lastLineIdx)
}
func (s *State) SelectBottom() {
s.SetLineSelectMode()
s.SelectLine(len(s.patchParser.PatchLines) - 1)
}
func (s *State) SelectTop() {
s.SetLineSelectMode()
s.SelectLine(0)
}
func (s *State) CalculateOrigin(currentOrigin int, bufferHeight int) int {
firstLineIdx, lastLineIdx := s.SelectedRange()
return calculateOrigin(currentOrigin, bufferHeight, firstLineIdx, lastLineIdx, s.GetSelectedLineIdx(), s.selectMode)
}