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merge_panel.go
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/
merge_panel.go
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// though this panel is called the merge panel, it's really going to use the main panel. This may change in the future
package main
import (
"bufio"
"bytes"
"io/ioutil"
"math"
"os"
"strings"
"github.com/fatih/color"
"github.com/jesseduffield/gocui"
)
func findConflicts(content string) ([]conflict, error) {
conflicts := make([]conflict, 0)
var newConflict conflict
for i, line := range splitLines(content) {
if line == "<<<<<<< HEAD" || line == "<<<<<<< MERGE_HEAD" || line == "<<<<<<< Updated upstream" {
newConflict = conflict{start: i}
} else if line == "=======" {
newConflict.middle = i
} else if strings.HasPrefix(line, ">>>>>>> ") {
newConflict.end = i
conflicts = append(conflicts, newConflict)
}
}
return conflicts, nil
}
func shiftConflict(conflicts []conflict) (conflict, []conflict) {
return conflicts[0], conflicts[1:]
}
func shouldHighlightLine(index int, conflict conflict, top bool) bool {
return (index >= conflict.start && index <= conflict.middle && top) || (index >= conflict.middle && index <= conflict.end && !top)
}
func coloredConflictFile(content string, conflicts []conflict, conflictIndex int, conflictTop, hasFocus bool) (string, error) {
if len(conflicts) == 0 {
return content, nil
}
conflict, remainingConflicts := shiftConflict(conflicts)
var outputBuffer bytes.Buffer
for i, line := range splitLines(content) {
colourAttr := color.FgWhite
if i == conflict.start || i == conflict.middle || i == conflict.end {
colourAttr = color.FgRed
}
colour := color.New(colourAttr)
if hasFocus && conflictIndex < len(conflicts) && conflicts[conflictIndex] == conflict && shouldHighlightLine(i, conflict, conflictTop) {
colour.Add(color.Bold)
}
if i == conflict.end && len(remainingConflicts) > 0 {
conflict, remainingConflicts = shiftConflict(remainingConflicts)
}
outputBuffer.WriteString(coloredString(line, colour) + "\n")
}
return outputBuffer.String(), nil
}
func handleSelectTop(g *gocui.Gui, v *gocui.View) error {
state.ConflictTop = true
return refreshMergePanel(g)
}
func handleSelectBottom(g *gocui.Gui, v *gocui.View) error {
state.ConflictTop = false
return refreshMergePanel(g)
}
func handleSelectNextConflict(g *gocui.Gui, v *gocui.View) error {
if state.ConflictIndex >= len(state.Conflicts)-1 {
return nil
}
state.ConflictIndex++
return refreshMergePanel(g)
}
func handleSelectPrevConflict(g *gocui.Gui, v *gocui.View) error {
if state.ConflictIndex <= 0 {
return nil
}
state.ConflictIndex--
return refreshMergePanel(g)
}
func isIndexToDelete(i int, conflict conflict, pick string) bool {
return i == conflict.middle ||
i == conflict.start ||
i == conflict.end ||
pick != "both" &&
(pick == "bottom" && i > conflict.start && i < conflict.middle) ||
(pick == "top" && i > conflict.middle && i < conflict.end)
}
func resolveConflict(g *gocui.Gui, conflict conflict, pick string) error {
gitFile, err := getSelectedFile(g)
if err != nil {
return err
}
file, err := os.Open(gitFile.Name)
if err != nil {
return err
}
defer file.Close()
reader := bufio.NewReader(file)
output := ""
for i := 0; true; i++ {
line, err := reader.ReadString('\n')
if err != nil {
break
}
if !isIndexToDelete(i, conflict, pick) {
output += line
}
}
devLog(output)
return ioutil.WriteFile(gitFile.Name, []byte(output), 0644)
}
func pushFileSnapshot(g *gocui.Gui) error {
gitFile, err := getSelectedFile(g)
if err != nil {
return err
}
content, err := catFile(gitFile.Name)
if err != nil {
return err
}
state.EditHistory.Push(content)
return nil
}
func handlePopFileSnapshot(g *gocui.Gui, v *gocui.View) error {
if state.EditHistory.Len() == 0 {
return nil
}
prevContent := state.EditHistory.Pop().(string)
gitFile, err := getSelectedFile(g)
if err != nil {
return err
}
ioutil.WriteFile(gitFile.Name, []byte(prevContent), 0644)
return refreshMergePanel(g)
}
func handlePickHunk(g *gocui.Gui, v *gocui.View) error {
conflict := state.Conflicts[state.ConflictIndex]
pushFileSnapshot(g)
pick := "bottom"
if state.ConflictTop {
pick = "top"
}
err := resolveConflict(g, conflict, pick)
if err != nil {
panic(err)
}
refreshMergePanel(g)
return nil
}
func handlePickBothHunks(g *gocui.Gui, v *gocui.View) error {
conflict := state.Conflicts[state.ConflictIndex]
pushFileSnapshot(g)
err := resolveConflict(g, conflict, "both")
if err != nil {
panic(err)
}
return refreshMergePanel(g)
}
func currentViewName(g *gocui.Gui) string {
currentView := g.CurrentView()
return currentView.Name()
}
func refreshMergePanel(g *gocui.Gui) error {
cat, err := catSelectedFile(g)
if err != nil {
return err
}
state.Conflicts, err = findConflicts(cat)
if err != nil {
return err
}
if len(state.Conflicts) == 0 {
return handleCompleteMerge(g)
} else if state.ConflictIndex > len(state.Conflicts)-1 {
state.ConflictIndex = len(state.Conflicts) - 1
}
hasFocus := currentViewName(g) == "main"
if hasFocus {
renderMergeOptions(g)
}
content, err := coloredConflictFile(cat, state.Conflicts, state.ConflictIndex, state.ConflictTop, hasFocus)
if err != nil {
return err
}
if err := scrollToConflict(g); err != nil {
return err
}
return renderString(g, "main", content)
}
func scrollToConflict(g *gocui.Gui) error {
mainView, err := g.View("main")
if err != nil {
return err
}
if len(state.Conflicts) == 0 {
return nil
}
conflict := state.Conflicts[state.ConflictIndex]
ox, _ := mainView.Origin()
_, height := mainView.Size()
conflictMiddle := (conflict.end + conflict.start) / 2
newOriginY := int(math.Max(0, float64(conflictMiddle-(height/2))))
return mainView.SetOrigin(ox, newOriginY)
}
func switchToMerging(g *gocui.Gui) error {
state.ConflictIndex = 0
state.ConflictTop = true
_, err := g.SetCurrentView("main")
if err != nil {
return err
}
return refreshMergePanel(g)
}
func renderMergeOptions(g *gocui.Gui) error {
return renderOptionsMap(g, map[string]string{
"↑ ↓": "select hunk",
"← →": "navigate conflicts",
"space": "pick hunk",
"b": "pick both hunks",
"z": "undo",
})
}
func handleEscapeMerge(g *gocui.Gui, v *gocui.View) error {
filesView, err := g.View("files")
if err != nil {
return err
}
refreshFiles(g)
return switchFocus(g, v, filesView)
}
func handleCompleteMerge(g *gocui.Gui) error {
filesView, err := g.View("files")
if err != nil {
return err
}
stageSelectedFile(g)
refreshFiles(g)
return switchFocus(g, nil, filesView)
}