1 files changed, 247 insertions, 0 deletions
diff --git a/web/static.go b/web/static.go
new file mode 100644
index 0000000..3f3e766
--- /dev/null
+++ b/web/static.go
@@ -0,0 +1,247 @@
+// static.go — the offline export: the same pages written out as files.
+//
+// Everything that needs a server (comments, live activity, jj queries) is
+// omitted; the trace/notes toggle, the file finder and the note filters all
+// keep working, since they run in the browser.
+package web
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+func run(dir string, name string, args ...string) []byte {
+	cmd := exec.Command(name, args...)
+	cmd.Dir = dir
+	out, err := cmd.Output()
+	if err != nil {
+		if ee, ok := err.(*exec.ExitError); ok {
+			os.Stderr.Write(ee.Stderr)
+		}
+		fatal("%s %s: %v", name, strings.Join(args, " "), err)
+	}
+	return out
+}
+
+func buildSite(log logStore, repoAbs, out, title string, theme, light *Theme, themes *themeSet) {
+	start := time.Now()
+	entries := readLog(log)
+	ranked := buildModel(title, entries, "").Ranked
+	if len(ranked) == 0 {
+		fatal("log has no jj change ids")
+	}
+	// the most-logged change this repo actually has: a log can span repos, and
+	// the busiest change in it may belong to another one
+	var change string
+	var list []byte
+	for _, c := range ranked {
+		out, err := jjRun(repoAbs, "file", "list", "-r", c)
+		if err == nil {
+			change, list = c, out
+			break
+		}
+	}
+	if change == "" {
+		fatal("none of the log's %d changes are in %s — logs are per repository; point -repo at the one the trace was recorded in",
+			len(ranked), repoAbs)
+	}
+	// an export is a picture of one change, so it holds only what was
+	// recorded there; the notes page says how much of the log that leaves out
+	site := buildModel(title, entries, change)
+	site.Change = change
+	site.Theme, site.Light, site.Repo = theme, light, repoAbs
+	site.All = site.filesAt(strings.Split(strings.TrimRight(string(list), "\n"), "\n"), change)
+
+	commit := strings.TrimSpace(string(mustJJ(repoAbs, "log", "-r", site.Change, "--no-graph", "-T", "commit_id")))
+	tmp, err := os.MkdirTemp("", "notevi-")
+	if err != nil {
+		fatal("%v", err)
+	}
+	defer os.RemoveAll(tmp)
+	archive := exec.Command("git", "-C", repoAbs, "archive", commit)
+	untar := exec.Command("tar", "-x", "-C", tmp)
+	untar.Stdin, _ = archive.StdoutPipe()
+	untar.Stderr = os.Stderr
+	if err := untar.Start(); err != nil {
+		fatal("tar: %v", err)
+	}
+	if err := archive.Run(); err != nil {
+		fatal("git archive %s: %v", short(commit), err)
+	}
+	if err := untar.Wait(); err != nil {
+		fatal("tar: %v", err)
+	}
+
+	writeSite(site, out, tmp, themes)
+	stubs := 0
+	for _, f := range site.All {
+		if f.Stub != "" {
+			stubs++
+		}
+	}
+	fmt.Printf("notevi web: %d files (%d traced, %d not rendered), %d notes, %d agents in %s -> %s\n",
+		len(site.All), len(site.Order), stubs, len(site.Notes), len(site.Agents),
+		time.Since(start).Round(time.Millisecond), out)
+}
+
+func writeSite(site *Site, out, srcDir string, themes *themeSet) {
+	if themes == nil {
+		themes = &themeSet{}
+	}
+	hl := newHighlighter(site.Theme, site.Light)
+	tpl := newTemplates(hl)
+	if err := os.MkdirAll(out, 0o755); err != nil {
+		fatal("%v", err)
+	}
+
+	each := func(fn func(f *File)) {
+		sem := make(chan struct{}, runtime.NumCPU())
+		var wg sync.WaitGroup
+		for _, f := range site.All {
+			wg.Add(1)
+			sem <- struct{}{}
+			go func(f *File) {
+				defer func() { <-sem; wg.Done() }()
+				fn(f)
+			}(f)
+		}
+		wg.Wait()
+	}
+	// phase A: content — coverage percentages must exist before any tree
+	// or index below is written
+	each(func(f *File) {
+		src, err := os.ReadFile(filepath.Join(srcDir, f.Path))
+		switch {
+		case err != nil:
+			f.Stub = "not present in the archived commit"
+		case bytes.IndexByte(src, 0) >= 0:
+			f.Stub = "binary file — not rendered"
+		case len(src) > 2<<20:
+			f.Stub = fmt.Sprintf("file too large to render (%d KB)", len(src)/1024)
+		default:
+			f.render(src, hl)
+		}
+	})
+
+	cf := mustCreate(filepath.Join(out, "style.css"))
+	if err := renderCSS(cf, site); err != nil {
+		fatal("css: %v", err)
+	}
+	cf.Close()
+	for _, name := range []string{"app.js", "bemtevi.svg"} {
+		b, err := tfs.ReadFile("assets/" + name)
+		if err != nil {
+			fatal("%v", err)
+		}
+		if err := os.WriteFile(filepath.Join(out, name), b, 0o644); err != nil {
+			fatal("%v", err)
+		}
+	}
+	// the picker travels with the export: a <script src>/<link> pair loads
+	// from the filesystem, which is why the menu is a script and not JSON
+	for name, b := range map[string][]byte{"themes.css": themes.CSS, "themes.js": themes.JS} {
+		if err := os.WriteFile(filepath.Join(out, name), b, 0o644); err != nil {
+			fatal("%v", err)
+		}
+	}
+
+	// shared tree fragment: the only nav tree, fetched by every page; "@@" is
+	// replaced with the page root by app.js, since the fragment is fetched
+	// from any page depth
+	treeFrag := renderTree(site.All, func(p string) string { return "@@code/" + p + ".html" })
+	if err := os.WriteFile(filepath.Join(out, "tree.html"), []byte(treeFrag), 0o644); err != nil {
+		fatal("%v", err)
+	}
+
+	facets := site.Facets()
+	var info *Row
+	if rows, err := LogRows(site.Repo, site.Change, "", 1); err == nil {
+		for _, row := range rows {
+			if !row.Blank() {
+				r := row
+				info = &r
+				break
+			}
+		}
+	}
+	render := func(path string, p *page) {
+		p.Site, p.Facets = site, facets
+		p.ChangeID, p.Default, p.ChangeInfo = site.Change, site.Change, info
+		p.Scope, p.Here = "change", site.NotesAt[site.Change]
+		p.Elsewhere = site.NotesTotal - p.Here
+		p.Files = site.All
+		f := mustCreate(path)
+		if err := tpl.Execute(f, p); err != nil {
+			fatal("render %s: %v", path, err)
+		}
+		f.Close()
+	}
+
+	latest := site.FilterNotes(NoteFilter{})
+	if len(latest) > 24 {
+		latest = latest[:24]
+	}
+	render(filepath.Join(out, "index.html"), &page{Kind: "index", Title: site.Title, Notes: latest})
+
+	fullTree := renderTree(site.All, func(p string) string { return "code/" + p + ".html" })
+	render(filepath.Join(out, "files.html"), &page{Kind: "files", Title: "files — " + site.Title,
+		Tree: template.HTML(fullTree)})
+
+	render(filepath.Join(out, "notes.html"), &page{Kind: "notes", Title: "notes — " + site.Title,
+		Notes: site.FilterNotes(NoteFilter{})})
+
+	// phase B: every file page, in parallel
+	each(func(f *File) {
+		dst := filepath.Join(out, "code", f.Path+".html")
+		os.MkdirAll(filepath.Dir(dst), 0o755)
+		depth := strings.Count(f.Path, "/") + 1
+		render(dst, &page{Kind: "file", Title: f.Path + " — " + site.Title,
+			Root: strings.Repeat("../", depth), Current: f.Path, File: f})
+	})
+
+	// phase C: a page per note, so a permalink handed to someone else opens
+	// in the export exactly as it does in the live app. The source is read
+	// again rather than kept from phase A: an export is a batch job, and the
+	// alternative is holding every file in memory for the sake of a few
+	// hundred excerpts.
+	if err := os.MkdirAll(filepath.Join(out, "note"), 0o755); err != nil {
+		fatal("%v", err)
+	}
+	for _, n := range site.Notes {
+		p := &page{Kind: "note", Title: noteTitle(n) + " — " + site.Title,
+			Root: "../", Current: n.File, Note: n, Thread: site.NoteThread(n.ID)}
+		if n.File != "" && n.Start > 0 {
+			src, err := os.ReadFile(filepath.Join(srcDir, n.File))
+			switch {
+			case err != nil:
+				p.ExErr = "not present in the archived commit"
+			case bytes.IndexByte(src, 0) >= 0:
+				p.ExErr = "binary file — not rendered"
+			default:
+				var cov []uint8
+				if f, ok := site.Files[n.File]; ok {
+					cov = f.Cov
+				}
+				p.Excerpt, p.ExFrom, p.ExTo = excerptFor(n.File, src, cov, hl, n)
+			}
+		}
+		render(filepath.Join(out, "note", strconv.Itoa(n.ID)+".html"), p)
+	}
+}
+
+func mustCreate(path string) *os.File {
+	f, err := os.Create(path)
+	if err != nil {
+		fatal("%v", err)
+	}
+	return f
+}