From fe9ec7a0b45c9fd23a615a8b95ade3e9c1ea2d12 Mon Sep 17 00:00:00 2001
From: Mitchell Riedstra <mitch@riedstra.dev>
Date: Mon, 15 Feb 2021 15:31:37 -0500
Subject: Another re-structure. Deleting code is wonderful.

---
 page/page.go | 211 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 211 insertions(+)
 create mode 100644 page/page.go

(limited to 'page/page.go')

diff --git a/page/page.go b/page/page.go
new file mode 100644
index 0000000..82f46f2
--- /dev/null
+++ b/page/page.go
@@ -0,0 +1,211 @@
+// page implements the website backed by a local filesystem.
+//
+// Reading the base template off the disk, then any markdown files which are
+// split into two sections by the DocumentSplit global variable.  The first
+// section is parsed as yaml to populate the Page struct.  The second portion is
+// markdown, first executed as part of the text/template then rendered by
+// blackfriday.
+//
+// Usage:
+//
+//    import (
+//    	"fmt"
+//    	"os"
+//    	site "riedstra.dev/mitch/go-website/page"
+//    )
+//    // Where some/path.md exists
+//    p := site.NewPage("/some/path")
+//    // Dump the rendered HTML to stdout
+//    err := p.Render(os.Stdout)
+//    if err != nil {
+//    	fmt.Fprintln(os.Stderr, err)
+//    }
+package page
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"text/template"
+
+	"github.com/russross/blackfriday"
+	"gopkg.in/yaml.v3"
+)
+
+// Page should not be created directly as it will not set the interal path
+// properly. Use NewPage instead.
+//
+// The exported fields can be filled in the yaml at the top of a page and
+// utilized within.
+type Page struct {
+	path        string
+	Title       string
+	Head        string
+	Description string
+	// Tags to apply to the page in question. Useful for Index()
+	Tags      map[string]interface{}
+	Date      *PageTime
+	Published bool
+	Vars      map[string]interface{}
+	markdown  []byte
+}
+
+// Global is meant to be supplied by external users of this package to populate
+// globally accessable information across all of the templates accessiable via
+// .Global care must be taken when utilizing this functionality
+var Global interface{}
+
+// CachePages determines whether or not the rendered page will be stored in
+// memory
+var CachePages = true
+
+// CacheIndex determines whether or not the index will be cached in memory
+// or rebuilt on each call
+var CacheIndex = true
+
+// BaseTemplate can be adjusted to change the base template used in rendering
+var BaseTemplate = "inc/base.html"
+
+// Suffix is applied to all pages for reading off of the disk
+var Suffix = ".md"
+
+// DocumentSplit is used to split the .md files into yaml and markdown
+var DocumentSplit = "|---\n"
+
+// Default logger
+var Logger = log.New(os.Stderr, "", log.LstdFlags)
+
+// NewPage returns a page struct with the path populated
+func NewPage(pth string) *Page {
+	return &Page{path: pth}
+}
+
+// NewPage Allow for the creation of a new page from the current page, does
+// not inlcude any information about the current page.
+func (p Page) NewPage(pth string) *Page {
+	return NewPage(pth)
+}
+
+// Path gets the current path set on the struct for the page in question
+// Useful if you're say iterating across tags to print out a list of
+// relevant posts on a blog or so by topic.
+func (p Page) Path() string {
+	return p.path
+}
+
+// Global is specifically for use inside of a page markdown file or
+// in a base template. This simply returns the package Global variable
+func (p *Page) Global() interface{} {
+	return Global
+}
+
+// SetVars Will set to `nil` if provided
+func (p *Page) SetVars(vars map[string]interface{}) {
+	p.Vars = vars
+}
+
+// Renders a page
+func (p *Page) Render(wr io.Writer) error {
+	if err := p.Read(); err != nil {
+		return err
+	}
+
+	t, err := template.ParseFiles(BaseTemplate)
+	if err != nil {
+		return err
+	}
+
+	// Automatically pull from the yml file if applicable
+	if p.Head != "" {
+		t, err = t.Parse(`
+			{{define "head"}}
+			{{.RenderHead}}
+			{{end}}
+		`)
+		if err != nil {
+			return err
+		}
+	}
+
+	return t.Execute(wr, p)
+}
+
+func (p *Page) RenderHead() (string, error) {
+	buf := &bytes.Buffer{}
+	t, err := template.New("Head").Parse(p.Head)
+	if err != nil {
+		return "", err
+	}
+	err = t.Execute(buf, p)
+	if err != nil {
+		return "", err
+	}
+	return string(buf.Bytes()), nil
+}
+
+// Reads in the special markdown file format for the website off of the disk
+func (p *Page) Read() error {
+	yamlBuf := bytes.NewBuffer(nil)
+	markdownBuf := bytes.NewBuffer(nil)
+
+	fh, err := os.Open(p.path + Suffix)
+	if err != nil {
+		return err
+	}
+	defer fh.Close()
+	rdr := bufio.NewReader(fh)
+
+	// Read in the file and split between markdown and yaml buffers
+	yamlDone := false
+	for {
+
+		bytes, err := rdr.ReadBytes('\n')
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+
+		// Is this the line where we stop reading the yaml and start reading markdown?
+		if DocumentSplit == string(bytes) && !yamlDone {
+			yamlDone = true
+			continue
+		}
+
+		if !yamlDone {
+			yamlBuf.Write(bytes)
+		} else {
+			markdownBuf.Write(bytes)
+		}
+	}
+
+	err = yaml.Unmarshal(yamlBuf.Bytes(), p)
+	if err != nil {
+		return err
+	}
+
+	p.markdown = markdownBuf.Bytes()
+	return nil
+}
+
+func (p *Page) RenderBody() (string, error) {
+	buf := &bytes.Buffer{}
+	t, err := template.New("Body").Parse(string(p.markdown))
+	if err != nil {
+		return "", err
+	}
+
+	err = t.Execute(buf, p)
+	if err != nil {
+		return "", err
+	}
+
+	return string(blackfriday.Run(buf.Bytes())), nil
+}
+
+func (p Page) String() string {
+	return fmt.Sprintf("Page: %s", p.path)
+}
-- 
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