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Deduplicate findReadmeFile() (#22177)
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This code was copy-pasted at some point. Revisit it to reunify it.

~~Doing that then encouraged simplifying the types of a couple of
related functions.~~

~~As a follow-up, move two helper functions, `isReadmeFile()` and
`isReadmeFileExtension()`, intimately tied to `findReadmeFile()`, in as
package-private.~~

Signed-off-by: Nick Guenther <nick.guenther@polymtl.ca>
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@kousu
kousu authored Feb 12, 2023
1 parent b0f1872 commit e1aca7c
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Showing 2 changed files with 78 additions and 98 deletions.
9 changes: 9 additions & 0 deletions modules/git/tree_entry.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,15 @@ func (te *TreeEntry) FollowLinks() (*TreeEntry, error) {
return entry, nil
}

// returns the subtree, or nil if this is not a tree
func (te *TreeEntry) Tree() *Tree {
t, err := te.ptree.repo.getTree(te.ID)
if err != nil {
return nil
}
return t
}

// GetSubJumpablePathName return the full path of subdirectory jumpable ( contains only one directory )
func (te *TreeEntry) GetSubJumpablePathName() string {
if te.IsSubModule() || !te.IsDir() {
Expand Down
167 changes: 69 additions & 98 deletions routers/web/repo/view.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -56,35 +56,54 @@ type namedBlob struct {
blob *git.Blob
}

// locate a README for a tree in one of the supported paths.
//
// entries is passed to reduce calls to ListEntries(), so
// this has precondition:
//
// entries == ctx.Repo.Commit.SubTree(ctx.Repo.TreePath).ListEntries()
//
// FIXME: There has to be a more efficient way of doing this
func getReadmeFileFromPath(ctx *context.Context, commit *git.Commit, treePath string) (*namedBlob, error) {
tree, err := commit.SubTree(treePath)
if err != nil {
return nil, err
}

entries, err := tree.ListEntries()
if err != nil {
return nil, err
}

func findReadmeFileInEntries(ctx *context.Context, entries []*git.TreeEntry) (*namedBlob, error) {
// Create a list of extensions in priority order
// 1. Markdown files - with and without localisation - e.g. README.en-us.md or README.md
// 2. Txt files - e.g. README.txt
// 3. No extension - e.g. README
exts := append(localizedExtensions(".md", ctx.Language()), ".txt", "") // sorted by priority
extCount := len(exts)
readmeFiles := make([]*namedBlob, extCount+1)

docsEntries := make([]*git.TreeEntry, 3) // (one of docs/, .gitea/ or .github/)
for _, entry := range entries {
if entry.IsDir() {
// as a special case for the top-level repo introduction README,
// fall back to subfolders, looking for e.g. docs/README.md, .gitea/README.zh-CN.txt, .github/README.txt, ...
// (note that docsEntries is ignored unless we are at the root)
lowerName := strings.ToLower(entry.Name())
switch lowerName {
case "docs":
if entry.Name() == "docs" || docsEntries[0] == nil {
docsEntries[0] = entry
}
case ".gitea":
if entry.Name() == ".gitea" || docsEntries[1] == nil {
docsEntries[1] = entry
}
case ".github":
if entry.Name() == ".github" || docsEntries[2] == nil {
docsEntries[2] = entry
}
}
continue
}
if i, ok := markup.IsReadmeFileExtension(entry.Name(), exts...); ok {
log.Debug("Potential readme file: %s", entry.Name())
if readmeFiles[i] == nil || base.NaturalSortLess(readmeFiles[i].name, entry.Blob().Name()) {
name := entry.Name()
isSymlink := entry.IsLink()
target := entry
if isSymlink {
var err error
target, err = entry.FollowLinks()
if err != nil && !git.IsErrBadLink(err) {
return nil, err
Expand All @@ -107,6 +126,33 @@ func getReadmeFileFromPath(ctx *context.Context, commit *git.Commit, treePath st
break
}
}

if ctx.Repo.TreePath == "" && readmeFile == nil {
for _, subTreeEntry := range docsEntries {
if subTreeEntry == nil {
continue
}
subTree := subTreeEntry.Tree()
if subTree == nil {
// this should be impossible; if subTreeEntry exists so should this.
continue
}
var err error
childEntries, err := subTree.ListEntries()
if err != nil {
return nil, err
}
readmeFile, err = findReadmeFileInEntries(ctx, childEntries)
if err != nil && !git.IsErrNotExist(err) {
return nil, err
}
if readmeFile != nil {
readmeFile.name = subTreeEntry.Name() + "/" + readmeFile.name
break
}
}
}

return readmeFile, nil
}

Expand All @@ -127,12 +173,20 @@ func renderDirectory(ctx *context.Context, treeLink string) {
ctx.Data["CanUploadFile"] = setting.Repository.Upload.Enabled && !ctx.Repo.Repository.IsArchived
}

readmeFile, readmeTreelink := findReadmeFile(ctx, entries, treeLink)
if ctx.Written() || readmeFile == nil {
if ctx.Written() {
return
}

readmeFile, err := findReadmeFileInEntries(ctx, entries)
if err != nil {
ctx.ServerError("findReadmeFileInEntries", err)
return
}
if readmeFile == nil {
return
}

renderReadmeFile(ctx, readmeFile, readmeTreelink)
renderReadmeFile(ctx, readmeFile, treeLink)
}

// localizedExtensions prepends the provided language code with and without a
Expand All @@ -157,89 +211,6 @@ func localizedExtensions(ext, languageCode string) (localizedExts []string) {
return []string{lowerLangCode + ext, ext}
}

func findReadmeFile(ctx *context.Context, entries git.Entries, treeLink string) (*namedBlob, string) {
// Create a list of extensions in priority order
// 1. Markdown files - with and without localisation - e.g. README.en-us.md or README.md
// 2. Txt files - e.g. README.txt
// 3. No extension - e.g. README
exts := append(localizedExtensions(".md", ctx.Language()), ".txt", "") // sorted by priority
extCount := len(exts)
readmeFiles := make([]*namedBlob, extCount+1)

docsEntries := make([]*git.TreeEntry, 3) // (one of docs/, .gitea/ or .github/)
for _, entry := range entries {
if entry.IsDir() {
lowerName := strings.ToLower(entry.Name())
switch lowerName {
case "docs":
if entry.Name() == "docs" || docsEntries[0] == nil {
docsEntries[0] = entry
}
case ".gitea":
if entry.Name() == ".gitea" || docsEntries[1] == nil {
docsEntries[1] = entry
}
case ".github":
if entry.Name() == ".github" || docsEntries[2] == nil {
docsEntries[2] = entry
}
}
continue
}

if i, ok := markup.IsReadmeFileExtension(entry.Name(), exts...); ok {
log.Debug("Potential readme file: %s", entry.Name())
name := entry.Name()
isSymlink := entry.IsLink()
target := entry
if isSymlink {
var err error
target, err = entry.FollowLinks()
if err != nil && !git.IsErrBadLink(err) {
ctx.ServerError("FollowLinks", err)
return nil, ""
}
}
if target != nil && (target.IsExecutable() || target.IsRegular()) {
readmeFiles[i] = &namedBlob{
name,
isSymlink,
target.Blob(),
}
}
}
}

var readmeFile *namedBlob
readmeTreelink := treeLink
for _, f := range readmeFiles {
if f != nil {
readmeFile = f
break
}
}

if ctx.Repo.TreePath == "" && readmeFile == nil {
for _, entry := range docsEntries {
if entry == nil {
continue
}
var err error
readmeFile, err = getReadmeFileFromPath(ctx, ctx.Repo.Commit, entry.GetSubJumpablePathName())
if err != nil {
ctx.ServerError("getReadmeFileFromPath", err)
return nil, ""
}
if readmeFile != nil {
readmeFile.name = entry.Name() + "/" + readmeFile.name
readmeTreelink = treeLink + "/" + util.PathEscapeSegments(entry.GetSubJumpablePathName())
break
}
}
}
return readmeFile, readmeTreelink
}

type fileInfo struct {
isTextFile bool
isLFSFile bool
Expand Down Expand Up @@ -342,7 +313,7 @@ func renderReadmeFile(ctx *context.Context, readmeFile *namedBlob, readmeTreelin
ctx.Data["EscapeStatus"], ctx.Data["FileContent"], err = markupRender(ctx, &markup.RenderContext{
Ctx: ctx,
RelativePath: path.Join(ctx.Repo.TreePath, readmeFile.name), // ctx.Repo.TreePath is the directory not the Readme so we must append the Readme filename (and path).
URLPrefix: readmeTreelink,
URLPrefix: path.Dir(readmeTreelink),
Metas: ctx.Repo.Repository.ComposeDocumentMetas(),
GitRepo: ctx.Repo.GitRepo,
}, rd)
Expand Down

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