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diff.go
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package diff
import (
"bufio"
"errors"
"fmt"
"io"
"net/http"
"strings"
"syscall"
"github.com/MakeNowJust/heredoc"
"github.com/cli/cli/v2/api"
"github.com/cli/cli/v2/internal/ghinstance"
"github.com/cli/cli/v2/internal/ghrepo"
"github.com/cli/cli/v2/pkg/cmd/pr/shared"
"github.com/cli/cli/v2/pkg/cmdutil"
"github.com/cli/cli/v2/pkg/iostreams"
"github.com/spf13/cobra"
)
type DiffOptions struct {
HttpClient func() (*http.Client, error)
IO *iostreams.IOStreams
Finder shared.PRFinder
SelectorArg string
UseColor bool
Patch bool
}
func NewCmdDiff(f *cmdutil.Factory, runF func(*DiffOptions) error) *cobra.Command {
opts := &DiffOptions{
IO: f.IOStreams,
HttpClient: f.HttpClient,
}
var colorFlag string
cmd := &cobra.Command{
Use: "diff [<number> | <url> | <branch>]",
Short: "View changes in a pull request",
Long: heredoc.Doc(`
View changes in a pull request.
Without an argument, the pull request that belongs to the current branch
is selected.
`),
Args: cobra.MaximumNArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
opts.Finder = shared.NewFinder(f)
if repoOverride, _ := cmd.Flags().GetString("repo"); repoOverride != "" && len(args) == 0 {
return cmdutil.FlagErrorf("argument required when using the `--repo` flag")
}
if len(args) > 0 {
opts.SelectorArg = args[0]
}
switch colorFlag {
case "always":
opts.UseColor = true
case "auto":
opts.UseColor = opts.IO.ColorEnabled()
case "never":
opts.UseColor = false
default:
return cmdutil.FlagErrorf("the value for `--color` must be one of \"auto\", \"always\", or \"never\"")
}
if runF != nil {
return runF(opts)
}
return diffRun(opts)
},
}
cmd.Flags().StringVar(&colorFlag, "color", "auto", "Use color in diff output: {always|never|auto}")
cmd.Flags().BoolVar(&opts.Patch, "patch", false, "Display diff in patch format")
return cmd
}
func diffRun(opts *DiffOptions) error {
findOptions := shared.FindOptions{
Selector: opts.SelectorArg,
Fields: []string{"number"},
}
pr, baseRepo, err := opts.Finder.Find(findOptions)
if err != nil {
return err
}
httpClient, err := opts.HttpClient()
if err != nil {
return err
}
diff, err := fetchDiff(httpClient, baseRepo, pr.Number, opts.Patch)
if err != nil {
return fmt.Errorf("could not find pull request diff: %w", err)
}
defer diff.Close()
err = opts.IO.StartPager()
if err != nil {
return err
}
defer opts.IO.StopPager()
if !opts.UseColor {
_, err = io.Copy(opts.IO.Out, diff)
if errors.Is(err, syscall.EPIPE) {
return nil
}
return err
}
return colorDiffLines(opts.IO.Out, diff)
}
func fetchDiff(httpClient *http.Client, baseRepo ghrepo.Interface, prNumber int, asPatch bool) (io.ReadCloser, error) {
url := fmt.Sprintf(
"%srepos/%s/pulls/%d",
ghinstance.RESTPrefix(baseRepo.RepoHost()),
ghrepo.FullName(baseRepo),
prNumber,
)
acceptType := "application/vnd.github.v3.diff"
if asPatch {
acceptType = "application/vnd.github.v3.patch"
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.Header.Set("Accept", acceptType)
resp, err := httpClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, api.HandleHTTPError(resp)
}
return resp.Body, nil
}
const lineBufferSize = 4096
var (
colorHeader = []byte("\x1b[1;38m")
colorAddition = []byte("\x1b[32m")
colorRemoval = []byte("\x1b[31m")
colorReset = []byte("\x1b[m")
)
func colorDiffLines(w io.Writer, r io.Reader) error {
diffLines := bufio.NewReaderSize(r, lineBufferSize)
wasPrefix := false
needsReset := false
for {
diffLine, isPrefix, err := diffLines.ReadLine()
if err != nil {
if errors.Is(err, io.EOF) {
break
}
return fmt.Errorf("error reading pull request diff: %w", err)
}
var color []byte
if !wasPrefix {
if isHeaderLine(diffLine) {
color = colorHeader
} else if isAdditionLine(diffLine) {
color = colorAddition
} else if isRemovalLine(diffLine) {
color = colorRemoval
}
}
if color != nil {
if _, err := w.Write(color); err != nil {
return err
}
needsReset = true
}
if _, err := w.Write(diffLine); err != nil {
return err
}
if !isPrefix {
if needsReset {
if _, err := w.Write(colorReset); err != nil {
return err
}
needsReset = false
}
if _, err := w.Write([]byte{'\n'}); err != nil {
return err
}
}
wasPrefix = isPrefix
}
return nil
}
var diffHeaderPrefixes = []string{"+++", "---", "diff", "index"}
func isHeaderLine(l []byte) bool {
dl := string(l)
for _, p := range diffHeaderPrefixes {
if strings.HasPrefix(dl, p) {
return true
}
}
return false
}
func isAdditionLine(l []byte) bool {
return len(l) > 0 && l[0] == '+'
}
func isRemovalLine(l []byte) bool {
return len(l) > 0 && l[0] == '-'
}