Implement YAML header parsing

Parses `title` and `tags` fields using default behavior.
Custom parsing logic is used for `author` (single and multiauthor
support), `date` (parses into `time.Time`), and meta (collects all other
header fields into a YAML string).

1 files changed, 13 insertions, 1 deletions

diff --git a/pkg/index/filters.go b/pkg/index/filters.go
index f59a5d6..315d125 100644
--- a/pkg/index/filters.go
+++ b/pkg/index/filters.go
@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 )
 
+// NOTE: in the future it would be interesting lua filters
 // TODO: create excluded path filter factory
 
 type DocFilter func(infoPath, io.ReadSeeker) bool
@@ -21,6 +22,17 @@ func NewMaxFilesizeFilter(size int64) DocFilter {
 	}
 }
 
+func NewFilenameFilter(excluded []string) DocFilter {
+	excludedSet := make(map[string]bool, len(excluded))
+	for _, filename := range excluded {
+		excludedSet[filename] = true
+	}
+	return func(ip infoPath, _ io.ReadSeeker) bool {
+		_, ok := excludedSet[filepath.Base(ip.path)]
+		return ok
+	}
+}
+
 func YamlHeaderFilter(_ infoPath, r io.ReadSeeker) bool {
 	const bufSize = 4096
 	buf := make([]byte, bufSize)
@@ -80,5 +92,5 @@ func YamlHeaderFilter(_ infoPath, r io.ReadSeeker) bool {
 }
 
 func DefaultFilters() []DocFilter {
-	return []DocFilter{NewExtensionFilter(".md"), NewMaxFilesizeFilter(200 * 1024)}
+	return []DocFilter{NewExtensionFilter(".md"), NewMaxFilesizeFilter(200 * 1024), YamlHeaderFilter}
 }