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Blame · server/web/code_tree.go

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a464f892 Keenan Nemetz 15d ago	1	package web
	2
	3	import (
	4	"net/url"
	5	"sort"
	6	"strings"
	7
d37d301f Keenan Nemetz 15h ago	8	"rodent.software/vole/core/git"
a464f892 Keenan Nemetz 15d ago	9	)
	10
	11	// maxTreeFiles bounds the server-rendered file tree. A repository larger than
	12	// this still browses, but the tree shows the first slice rather than turning a
	13	// page load into a very large DOM.
	14	const maxTreeFiles = 4000
	15
	16	// treeNode is one directory or file in the code browser's left column. Path is
	17	// always repository-relative; Open and Active are resolved against the file the
	18	// main pane is showing so a deep link arrives with its ancestors expanded.
	19	type treeNode struct {
	20	Name string
	21	Path string
	22	Type string
	23	Children []*treeNode
	24	Open bool
	25	Active bool
f6f4b1db Keenan Nemetz 15d ago	26	// Status is A, M, D or R on review-tree file rows. The code browser leaves
	27	// it empty.
	28	Status string
a464f892 Keenan Nemetz 15d ago	29	}
	30
	31	// treeView is the context passed to the recursive tree template. Templates
c717d4eb Keenan Nemetz 13d ago	32	// cannot build a struct literal, so this carries the repository, the ref and the
	33	// change down the recursion.
	34	//
628d4523 Keenan Nemetz 11d ago	35	// One context serves every tree because they are the same widget: the code
	36	// browser leaves Review and Commit empty, a change's Files tab names the request,
	37	// and a commit page names the commit. That field is all the difference between
	38	// "open this blob" and "open this changed file".
a464f892 Keenan Nemetz 15d ago	39	type treeView struct {
c717d4eb Keenan Nemetz 13d ago	40	Name string
	41	Ref string
	42	Review string
628d4523 Keenan Nemetz 11d ago	43	Commit string
c717d4eb Keenan Nemetz 13d ago	44	Nodes []*treeNode
	45	}
	46
	47	func treeContext(name, ref, review string, nodes []*treeNode) treeView {
	48	return treeView{Name: name, Ref: ref, Review: review, Nodes: nodes}
a464f892 Keenan Nemetz 15d ago	49	}
a464f892 Keenan Nemetz 15d ago	50
628d4523 Keenan Nemetz 11d ago	51	// commitTreeContext is the tree of the files one commit touched. A row opens that
	52	// file's diff in the commit's own pane rather than a blob at the commit.
	53	func commitTreeContext(name, commit string, nodes []*treeNode) treeView {
	54	return treeView{Name: name, Commit: commit, Nodes: nodes}
	55	}
	56
	57	// Branch re-roots the same tree one level down. The recursive template passes its
	58	// own context back so a child row keeps the repository and the change it belongs
	59	// to instead of rebuilding them from a subset of the fields.
	60	func (t treeView) Branch(nodes []*treeNode) treeView {
	61	t.Nodes = nodes
	62	return t
	63	}
	64
	65	// Diff reports whether the rows are changed files rather than repository blobs: a
	66	// review or a commit opens a diff pane and marks each row with its change status.
	67	func (t treeView) Diff() bool { return t.Review != "" \|\| t.Commit != "" }
	68
	69	// Href is where a row points: a blob at this ref, the file's diff inside the
	70	// change whose id is Review, or the file's diff inside a commit. The tree and the
	71	// pane it swaps share it so a link and its hx-get can never disagree.
	72	func (t treeView) Href(path string) string {
	73	switch {
	74	case t.Review != "":
ed03b3d1 Keenan Nemetz 2h ago	75	return "/" + t.Name + "/changes/" + t.Review + "/files/" + pathURL(path)
628d4523 Keenan Nemetz 11d ago	76	case t.Commit != "":
ed03b3d1 Keenan Nemetz 2h ago	77	return "/" + t.Name + "/commit/" + t.Commit + "/" + pathURL(path)
c717d4eb Keenan Nemetz 13d ago	78	}
ed03b3d1 Keenan Nemetz 2h ago	79	return "/" + t.Name + "/blob/" + url.PathEscape(t.Ref) + "/" + pathURL(path)
a464f892 Keenan Nemetz 15d ago	80	}
	81
	82	// buildFileTree flattens the repository's blobs and folds them back into the
	83	// nested shape a file browser needs. Git has no empty directories to show.
	84	func buildFileTree(g git.Repo, commit, active string) ([]treeNode, bool) {
	85	entries, err := g.LsTreeR(commit)
	86	if err != nil {
	87	return nil, false
	88	}
	89	truncated := false
	90	if len(entries) > maxTreeFiles {
	91	entries = entries[:maxTreeFiles]
	92	truncated = true
	93	}
	94	root := &treeNode{Type: "tree"}
	95	for _, e := range entries {
	96	if e.Type != "blob" {
	97	continue
	98	}
	99	parts := strings.Split(e.Name, "/")
	100	cur := root
	101	for i, part := range parts {
	102	path := strings.Join(parts[:i+1], "/")
	103	last := i == len(parts)-1
	104	if last {
	105	cur.Children = append(cur.Children, &treeNode{
	106	Name: part, Path: path, Type: "blob", Active: path == active,
	107	})
	108	continue
	109	}
	110	var next *treeNode
	111	for _, child := range cur.Children {
	112	if child.Type == "tree" && child.Name == part {
	113	next = child
	114	break
	115	}
	116	}
	117	if next == nil {
	118	next = &treeNode{Name: part, Path: path, Type: "tree"}
	119	cur.Children = append(cur.Children, next)
	120	}
	121	if active == path \|\| strings.HasPrefix(active, path+"/") {
	122	next.Open = true
	123	}
	124	if active == path {
	125	next.Active = true
	126	next.Open = true
	127	}
	128	cur = next
	129	}
	130	}
	131	sortTree(root)
	132	return root.Children, truncated
	133	}
	134
	135	// sortEntries puts directories before files, then names in the same order the
	136	// tree uses, so the branch root and the tree read alike.
	137	func sortEntries(entries []git.Entry) {
	138	sort.SliceStable(entries, func(i, j int) bool {
	139	a, b := entries[i], entries[j]
	140	if a.Type != b.Type {
	141	return a.Type == "tree"
	142	}
	143	an, bn := strings.ToLower(a.Name), strings.ToLower(b.Name)
144	if an != bn {
145	return an < bn
146	}
147	return a.Name < b.Name
148	})
149	}
150
151	func sortTree(n *treeNode) {
152	sort.Slice(n.Children, func(i, j int) bool {
153	a, b := n.Children[i], n.Children[j]
154	if a.Type != b.Type {
155	return a.Type == "tree"
156	}
157	an, bn := strings.ToLower(a.Name), strings.ToLower(b.Name)
158	if an != bn {
159	return an < bn
160	}
161	return a.Name < b.Name
162	})
163	for _, child := range n.Children {
164	if child.Type == "tree" {
165	sortTree(child)
166	}
167	}
168	}
169
170	// pathURL escapes each segment of a repository path while keeping the slashes
171	// that make it a path. url.PathEscape alone would encode the separators.
172	func pathURL(p string) string {
173	if p == "" {
174	return ""
175	}
176	parts := strings.Split(p, "/")
177	for i := range parts {
178	parts[i] = url.PathEscape(parts[i])
179	}
180	return strings.Join(parts, "/")
181	}
182
183	// joinPath appends a directory entry to the current path.
184	func joinPath(base, name string) string {
185	if base == "" {
186	return name
187	}
188	return base + "/" + name
189	}
190
191	// parentPath returns the directory above p, or "" when p is already at the root.
192	func parentPath(p string) string {
193	i := strings.LastIndexByte(p, '/')
194	if i < 0 {
195	return ""
196	}
197	return p[:i]
198	}