hswg: use inotify to watch for changed documents
Now we force the glob to be *.adoc, as well as *.asciidoc, and there can only be one document directory. The previous single-run mode is no longer supported.
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parent
49a685c32e
commit
04e19f5186
GPG Key ID:
A0420B94F92B9493
244
hswg/main.go
244
hswg/main.go
@ -4,6 +4,7 @@ package main
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import (
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"bytes"
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"encoding/binary"
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"encoding/xml"
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"fmt"
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"html/template"
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@ -11,10 +12,12 @@ import (
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"io/ioutil"
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"log"
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"os"
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"os/signal"
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"path/filepath"
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"regexp"
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"sort"
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"strings"
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"syscall"
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"time"
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"unicode"
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"unicode/utf8"
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@ -157,7 +160,14 @@ func (e *Entry) Published() *time.Time {
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}
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}
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var extRE = regexp.MustCompile(`\.[^/.]*$`)
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var (
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globs = []string{"*.adoc", "*.asciidoc"}
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extRE = regexp.MustCompile(`\.[^/.]*$`)
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)
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func pathToName(path string) string {
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return stripExtension(filepath.Base(path))
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}
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func stripExtension(path string) string {
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return extRE.ReplaceAllString(path, "")
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@ -172,7 +182,8 @@ func resultPath(path string) string {
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func makeLink(m *map[string]*Entry, name string) string {
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e := (*m)[name]
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return fmt.Sprintf("<a href='%s'>%s</a>", e.PathDestination, name)
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return fmt.Sprintf("<a href='%s'>%s</a>",
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filepath.Clean(e.PathDestination), name)
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}
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var linkWordRE = regexp.MustCompile(`\b\p{Lu}\p{L}*\b`)
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@ -219,31 +230,28 @@ func renderEntry(name string, e *Entry) error {
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return nil
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}
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func loadEntries(globs []string) (map[string]*Entry, error) {
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// Create a map from document names to their page entries.
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func makeEntry(path string) *Entry {
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return &Entry{
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PathSource: path,
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PathDestination: resultPath(path),
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}
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}
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// loadEntries creates a map from document names to their page entries.
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func loadEntries(dirname string) (map[string]*Entry, error) {
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entries := map[string]*Entry{}
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for _, glob := range globs {
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matches, err := filepath.Glob(glob)
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matches, err := filepath.Glob(filepath.Join(dirname, glob))
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if err != nil {
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return nil, fmt.Errorf("%s: %s\n", glob, err)
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return nil, fmt.Errorf("%s: %s", dirname, err)
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}
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for _, path := range matches {
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name := stripExtension(filepath.Base(path))
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name := pathToName(path)
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if conflict, ok := entries[name]; ok {
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return nil, fmt.Errorf("%s: conflicts with %s\n",
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return nil, fmt.Errorf("%s: conflicts with %s",
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name, conflict.PathSource)
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}
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entries[name] = &Entry{
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PathSource: path,
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PathDestination: resultPath(path),
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backlinks: map[string]bool{},
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}
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}
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}
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for name, e := range entries {
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if err := renderEntry(name, e); err != nil {
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return nil, err
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entries[name] = makeEntry(path)
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}
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}
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return entries, nil
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@ -269,21 +277,6 @@ func writeEntry(e *Entry, t *template.Template,
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return t.Execute(f, e)
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}
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func finalizeEntries(entries *map[string]*Entry) {
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for name, e := range *entries {
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// Expand LinkWords anywhere between <tags>.
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// We want something like the inverse of Regexp.ReplaceAllStringFunc.
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raw, last, expanded := e.raw, 0, bytes.NewBuffer(nil)
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for _, where := range tagRE.FindAllIndex(raw, -1) {
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_, _ = expanded.Write(expand(entries, name, raw[last:where[0]]))
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_, _ = expanded.Write(raw[where[0]:where[1]])
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last = where[1]
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}
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_, _ = expanded.Write(expand(entries, name, raw[last:]))
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e.Content = template.HTML(expanded.String())
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}
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}
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func writeIndex(path string, t *template.Template,
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entries *map[string]*Entry) error {
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// Reorder entries reversely, primarily by date, secondarily by filename.
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@ -315,10 +308,144 @@ func writeIndex(path string, t *template.Template,
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return err
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}
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// TODO(p): Splitting content to categories would be nice.
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// TODO(p): Splitting content to categories would be nice. Or tags.
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return t.Execute(f, ordered)
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}
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func finalizeEntries(entries *map[string]*Entry, t *template.Template,
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indexPath string, indexT *template.Template) {
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for name, e := range *entries {
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e.backlinks = map[string]bool{}
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if e.raw == nil {
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if err := renderEntry(name, e); err != nil {
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log.Printf("%s: %s\n", name, err)
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}
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}
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}
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for name, e := range *entries {
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// Expand LinkWords anywhere between <tags>.
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// We want something like the inverse of Regexp.ReplaceAllStringFunc.
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raw, last, expanded := e.raw, 0, bytes.NewBuffer(nil)
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for _, where := range tagRE.FindAllIndex(raw, -1) {
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_, _ = expanded.Write(expand(entries, name, raw[last:where[0]]))
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_, _ = expanded.Write(raw[where[0]:where[1]])
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last = where[1]
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}
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_, _ = expanded.Write(expand(entries, name, raw[last:]))
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e.Content = template.HTML(expanded.String())
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}
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for name, e := range *entries {
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// Don't overwrite failed renders.
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if e.raw == nil {
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continue
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}
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if err := writeEntry(e, t, entries); err != nil {
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log.Printf("%s: %s\n", name, err)
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}
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}
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if err := writeIndex(indexPath, indexT, entries); err != nil {
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log.Printf("%s: %s\n", indexPath, err)
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}
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}
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type watchEvent struct {
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path string // the path of the target
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present bool // if not, the file has been removed
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}
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func dispatchEvents(dirname string, r io.Reader, ch chan<- *watchEvent) error {
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var e syscall.InotifyEvent
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for {
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// FIXME(p): This has to respect the machine's endianness.
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// Perhaps use the unsafe package.
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err := binary.Read(r, binary.LittleEndian, &e)
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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switch {
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case e.Mask&syscall.IN_IGNORED != 0:
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return fmt.Errorf("watch removed by kernel")
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case e.Mask&syscall.IN_Q_OVERFLOW != 0:
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log.Println("inotify: queue overflowed")
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ch <- nil
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continue
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case e.Len == 0:
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continue
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}
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base := make([]byte, e.Len)
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if n, err := r.Read(base); err != nil {
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return err
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} else if n < int(e.Len) {
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return fmt.Errorf("short read")
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}
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basename, interesting := string(base[:bytes.IndexByte(base, 0)]), false
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for _, glob := range globs {
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if matches, _ := filepath.Match(glob, basename); matches {
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interesting = true
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}
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}
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if !interesting {
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continue
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}
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event := &watchEvent{path: filepath.Join(dirname, basename)}
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if e.Mask&syscall.IN_MODIFY != 0 || e.Mask&syscall.IN_MOVED_TO != 0 ||
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e.Mask&syscall.IN_CLOSE_WRITE != 0 {
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event.present = true
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ch <- event
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}
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if e.Mask&syscall.IN_DELETE != 0 || e.Mask&syscall.IN_MOVED_FROM != 0 {
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event.present = false
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ch <- event
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}
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}
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}
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func watchDirectory(dirname string) (<-chan *watchEvent, error) {
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inotifyFD, err := syscall.InotifyInit1(0)
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if err != nil {
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return nil, err
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}
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// We're ignoring IN_CREATE, as it doesn't seem to be useful,
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// and we're leaving out IN_MODIFY since VIM always triggers IN_CLOSE_WRITE,
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// saving us from having to coalesce plentiful similar events.
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_, err = syscall.InotifyAddWatch(inotifyFD, dirname, syscall.IN_ONLYDIR|
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syscall.IN_MOVE|syscall.IN_DELETE|syscall.IN_CLOSE_WRITE)
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if err != nil {
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return nil, err
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}
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inotifyFile := os.NewFile(uintptr(inotifyFD), "inotify")
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buf := make([]byte, syscall.SizeofInotifyEvent+syscall.PathMax+1)
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ch := make(chan *watchEvent)
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go func() {
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// Trigger an initial rendering run.
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ch <- nil
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defer close(ch)
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for {
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n, err := inotifyFile.Read(buf)
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if err != nil {
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log.Println(err)
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return
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}
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err = dispatchEvents(dirname, bytes.NewReader(buf[:n]), ch)
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if err != nil {
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log.Printf("inotify: %s\n", err)
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return
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}
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}
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}()
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return ch, nil
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}
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func singleFile() {
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html, meta, err := Render(os.Stdin, configuration.NewConfiguration())
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if err != nil {
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@ -336,11 +463,11 @@ func main() {
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singleFile()
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return
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}
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if len(os.Args) < 4 {
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log.Fatalf("usage: %s TEMPLATE INDEX GLOB...\n", os.Args[0])
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if len(os.Args) != 4 {
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log.Fatalf("usage: %s TEMPLATE INDEX DIRECTORY\n", os.Args[0])
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}
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argTemplate, argIndex, argGlobs := os.Args[1], os.Args[2], os.Args[3:]
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argTemplate, argIndex, argDirectory := os.Args[1], os.Args[2], os.Args[3]
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// Read a template for entries.
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header, err := ioutil.ReadFile(argTemplate)
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@ -362,21 +489,40 @@ func main() {
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log.Fatalln(err)
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}
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// Process all entries.
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entries, err := loadEntries(argGlobs)
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// Re-render as needed, avoid having to trigger anything manually.
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var entries map[string]*Entry
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directoryWatch, err := watchDirectory(argDirectory)
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if err != nil {
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log.Fatalln(err)
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}
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finalizeEntries(&entries)
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for _, e := range entries {
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if err := writeEntry(e, tmplEntry, &entries); err != nil {
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log.Fatalln(err)
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signals := make(chan os.Signal)
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signal.Notify(signals, syscall.SIGINT, syscall.SIGHUP, syscall.SIGTERM)
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for {
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select {
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case <-signals:
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os.Exit(0)
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case event, ok := <-directoryWatch:
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if !ok {
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os.Exit(1)
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}
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if event == nil {
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log.Println("reloading all files")
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if entries, err = loadEntries(argDirectory); err != nil {
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log.Println(err)
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}
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} else if event.present {
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log.Printf("updating %s\n", event.path)
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entries[pathToName(event.path)] = makeEntry(event.path)
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} else {
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log.Printf("removing %s\n", event.path)
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delete(entries, pathToName(event.path))
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os.Remove(resultPath(event.path))
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}
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finalizeEntries(&entries, tmplEntry, argIndex, tmplIndex)
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log.Println("done")
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}
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}
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// Write an index.
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if err := writeIndex(argIndex, tmplIndex, &entries); err != nil {
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log.Fatalln(err)
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}
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}
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