1 files changed, 260 insertions, 0 deletions
diff --git a/post/post.go b/post/post.go
new file mode 100644
index 0000000..19a8e73
--- /dev/null
+++ b/post/post.go
@@ -0,0 +1,260 @@
+/*
+Package post provides the data and behavior for the fundamental atomic
+unit of a site: a post. Posts are represented as text files, then converted to HTML and other formats
+*/
+package post
+
+import (
+	"snkt/config"
+	"snkt/render"
+	"snkt/text"
+	"github.com/russross/blackfriday"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var Template = "post"
+
+type Post struct {
+	// Representations of the entire post text
+	Raw      []byte
+	Unparsed string
+
+	// Metadata
+	Meta       map[string]string
+	SourceFile string
+	Title      string `json:"title"`
+	Permalink  string `json:"permalink"`
+	Time       time.Time
+	Year       int
+	Month      time.Month
+	Day        int
+	InFuture   bool
+
+	// Content text -- raw, unprocessed, unfiltered markdown
+	Text string
+
+	// Content text -- processed into HTML via markdown and other filters
+	Content string
+
+	// Content with sources and references resolved to absolute URLs
+	AbsoluteContent string
+
+	// Post following chronologically (later)
+	Next *Post
+	// Post preceding chronologically (earlier)
+	Prev *Post
+
+	// Precomputed dates as strings
+	Date    string
+	RssDate string
+
+	FileInfo os.FileInfo
+
+	Site sitemeta
+}
+
+type sitemeta interface {
+	GetURL() string
+	GetTitle() string
+}
+
+type Posts []*Post
+
+func (posts Posts) Len() int {
+	return len(posts)
+}
+
+func (posts Posts) Less(i, j int) bool {
+	return posts[i].Time.Before(posts[j].Time)
+}
+
+func (s Posts) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func NewPost(s sitemeta) *Post {
+	var p Post
+	p.Site = s
+	return &p
+}
+
+/*
+Read reads a post from file fi, and parses it into the Post struct, performing any work needed to fully populate the struct
+*/
+func (p *Post) Read(fi os.FileInfo) {
+	p.Meta = make(map[string]string)
+	p.FileInfo = fi
+	p.SourceFile = p.FileInfo.Name()
+	var err error
+	p.Raw, err = ioutil.ReadFile(path.Join(config.Config.TxtDir, fi.Name()))
+	if err != nil {
+		log.Println(err)
+	}
+	p.Unparsed = string(p.Raw)
+	p.parse()
+}
+
+/*
+Parse parses the metadata prefix from the top of the post file's raw bytes, and puts the rest in the text segment. Meta is a name:value mapping
+Title, date and other metadata are derived
+*/
+func (p *Post) parse() {
+	//
+	// Text + Meta[string][string]
+	//
+	p.splitTextMeta()
+
+	//
+	// Title
+	//
+	p.Title = p.Meta["title"]
+	// Use filename as backup fi we have no explicit title
+	if p.Title == "" {
+		p.Title = p.SourceFile
+	}
+
+	//
+	// Dates
+	//
+	// we only deal with yyyy-mm-dd [some legacy dates from my archives have times tacked on]
+	// TODO: recover from empty dates/titles
+	// TODO: probably should actually use times when present and clean up my archives
+	var date_str = ""
+	ds := strings.Fields(p.Meta["date"])
+	if len(ds) > 0 {
+		date_str = ds[0]
+	}
+	var err error
+	p.Time, err = time.Parse("2006-1-2", date_str)
+	if err != nil {
+
+		if config.Config.Verbose {
+			log.Println(err)
+		}
+
+		// fallback is to use file modtime
+		// should use create time but that doesn't seem to be in stdlib
+		// TODO: figure out how to use file birth time
+		p.Time = p.FileInfo.ModTime()
+	}
+
+	p.Year, p.Month, p.Day = p.Time.Date()
+	/* golang date format refresher
+	      1 2  3  4  5  7     6
+	Mon Jan 2 15:04:05 MST 2006 */
+
+	p.Date = p.Time.Format("January 2, 2006")
+	p.RssDate = p.Time.Format("Mon, 2 Jan 2006 15:04:05 GMT")
+	p.InFuture = time.Now().Before(p.Time)
+	p.Permalink = p.GenPermalink()
+
+	//
+	// Content
+	//
+	p.Content = string(p.Filter([]byte(p.Text)))
+	p.AbsoluteContent = render.ResolveURLs(p.Content, p.Site.GetURL())
+}
+
+/*
+splitText splits up p.Unparsed into p.Text and p.Meta[attr][value]
+*/
+func (p *Post) splitTextMeta() {
+	SEPARATOR := ":"
+	lines := strings.Split(p.Unparsed, "\n")
+	for _, line := range lines {
+		if !strings.Contains(line, SEPARATOR) {
+			break
+		}
+		splitdex := strings.Index(line, SEPARATOR)
+		attr := strings.ToLower(strings.TrimSpace(line[0:splitdex]))
+		value := strings.TrimSpace(line[splitdex+1:])
+		p.Meta[attr] = value
+	}
+	p.Text = strings.Join(lines[len(p.Meta):], "\n")
+}
+
+func (p *Post) ParseFmt(s string) string {
+	// TODO: document and add strftime like formats
+	s = strings.Replace(s, "%Y", strconv.Itoa(p.Year), -1)
+	s = strings.Replace(s, "%M", strconv.Itoa(int(p.Month)), -1)
+	s = strings.Replace(s, "%D", strconv.Itoa(p.Day), -1)
+	s = strings.Replace(s, "%F", p.CleanFilename(), -1)
+	s = strings.Replace(s, "%T", p.CleanTitle(), -1)
+
+	s = strings.Replace(s, "$Y", strconv.Itoa(p.Year), -1)
+	s = strings.Replace(s, "$M", strconv.Itoa(int(p.Month)), -1)
+	s = strings.Replace(s, "$D", strconv.Itoa(p.Day), -1)
+	s = strings.Replace(s, "$F", p.CleanFilename(), -1)
+	s = strings.Replace(s, "$T", p.CleanTitle(), -1)
+
+	s = strings.Replace(s, ".File", p.CleanFilename(), -1)
+	s = strings.Replace(s, ".Title", p.CleanTitle(), -1)
+	s = strings.Replace(s, ".Year", strconv.Itoa(p.Year), -1)
+	s = strings.Replace(s, ".Month", strconv.Itoa(int(p.Month)), -1)
+	s = strings.Replace(s, ".Day", strconv.Itoa(p.Day), -1)
+
+	return s
+}
+
+func (p *Post) CleanFilename() string {
+	return text.SanitizeFilename(text.RemoveExt(p.SourceFile))
+}
+
+func (p *Post) CleanTitle() string {
+	return text.SanitizeFilename(p.Title)
+}
+
+
+
+/*
+GenPermalink generates the permalink for the post given the PermalinkFmt format specified in the configuration file.
+*/
+func (p *Post) GenPermalink() string {
+	pl := config.Config.PermalinkFmt
+	return p.ParseFmt(pl)
+}
+
+/*
+Target returns a string representing the file system location to write the output file representing the post.
+*/
+func (p Post) Target() string {
+	pf := config.Config.PostFileFmt
+	return path.Join(config.Config.HtmlDir, p.ParseFmt(pf))
+}
+
+/*
+Render returns the post rendered as HTML via the post template with Post and Site as context.
+*/
+func (p Post) Render() []byte {
+	data := struct {
+		Post interface{}
+		Site interface{}
+	}{&p, &p.Site}
+	return render.Render(Template, data)
+}
+
+/*
+Filter runs the text through filters defined by render.Filter and marddown, returning text suitable for HTML output.
+*/
+func (p *Post) Filter(txt []byte) []byte {
+	txt = render.Filter(txt)
+	txt = blackfriday.MarkdownCommon(txt)
+	return txt
+}
+
+/*
+Limit returns a slice of Posts up to the int limit provided. If the limit is larger than the slice, it just returns the whole slice.
+*/
+func (posts Posts) Limit(limit int) Posts {
+	if len(posts) < limit {
+		return posts
+	} else {
+		return posts[0:limit]
+	}
+}