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package main
import (
"regexp"
"strings"
"gopkg.in/src-d/go-git.v4/plumbing"
)
// context:
// we want to only show 'safe' branches (ones that haven't e.g. been deleted)
// which `git branch -a` gives us, but we also want the recency data that
// git reflog gives us.
// So we get the HEAD, then append get the reflog branches that intersect with
// our safe branches, then add the remaining safe branches, ensuring uniqueness
// along the way
type branchListBuilder struct{}
func newBranchListBuilder() *branchListBuilder {
return &branchListBuilder{}
}
func (b *branchListBuilder) obtainCurrentBranch() Branch {
// I used go-git for this, but that breaks if you've just done a git init,
// even though you're on 'master'
branchName, _ := runDirectCommand("git symbolic-ref --short HEAD")
return Branch{Name: strings.TrimSpace(branchName), Recency: " *"}
}
func (*branchListBuilder) obtainReflogBranches() []Branch {
branches := make([]Branch, 0)
rawString, err := runDirectCommand("git reflog -n100 --pretty='%cr|%gs' --grep-reflog='checkout: moving' HEAD")
if err != nil {
return branches
}
branchLines := splitLines(rawString)
for _, line := range branchLines {
timeNumber, timeUnit, branchName := branchInfoFromLine(line)
timeUnit = abbreviatedTimeUnit(timeUnit)
branch := Branch{Name: branchName, Recency: timeNumber + timeUnit}
branches = append(branches, branch)
}
return branches
}
func (b *branchListBuilder) obtainSafeBranches() []Branch {
branches := make([]Branch, 0)
bIter, err := r.Branches()
if err != nil {
panic(err)
}
err = bIter.ForEach(func(b *plumbing.Reference) error {
name := b.Name().Short()
branches = append(branches, Branch{Name: name})
return nil
})
return branches
}
func (b *branchListBuilder) appendNewBranches(finalBranches, newBranches, existingBranches []Branch, included bool) []Branch {
for _, newBranch := range newBranches {
if included == branchIncluded(newBranch.Name, existingBranches) {
finalBranches = append(finalBranches, newBranch)
}
}
return finalBranches
}
func (b *branchListBuilder) build() []Branch {
branches := make([]Branch, 0)
head := b.obtainCurrentBranch()
safeBranches := b.obtainSafeBranches()
if len(safeBranches) == 0 {
return append(branches, head)
}
reflogBranches := b.obtainReflogBranches()
reflogBranches = uniqueByName(append([]Branch{head}, reflogBranches...))
branches = b.appendNewBranches(branches, reflogBranches, safeBranches, true)
branches = b.appendNewBranches(branches, safeBranches, branches, false)
return branches
}
func uniqueByName(branches []Branch) []Branch {
finalBranches := make([]Branch, 0)
for _, branch := range branches {
if branchIncluded(branch.Name, finalBranches) {
continue
}
finalBranches = append(finalBranches, branch)
}
return finalBranches
}
// A line will have the form '10 days ago master' so we need to strip out the
// useful information from that into timeNumber, timeUnit, and branchName
func branchInfoFromLine(line string) (string, string, string) {
r := regexp.MustCompile("\\|.*\\s")
line = r.ReplaceAllString(line, " ")
words := strings.Split(line, " ")
return words[0], words[1], words[3]
}
func abbreviatedTimeUnit(timeUnit string) string {
r := regexp.MustCompile("s$")
timeUnit = r.ReplaceAllString(timeUnit, "")
timeUnitMap := map[string]string{
"hour": "h",
"minute": "m",
"second": "s",
"week": "w",
"year": "y",
"day": "d",
"month": "m",
}
return timeUnitMap[timeUnit]
}
|
