expose site posts and tags to template rendering

Squashed commit of the following:

commit c45734422ef038438a0b6eb4c3065df9cbebcc5e
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 21:27:47 2024 -0300

    tags test passing

commit 88294405603b2103f9f8cba3b130ad2d40e58a36
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 21:12:08 2024 -0300

    ensure posts are sorted by date

commit df7c945fcc1490613b6068da3fc487b9ffa44ba5
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 20:55:51 2024 -0300

    prepare to test tags

commit 3d7c3f380c3933d6cd9f949d3d2cf9ef144bd6ae
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 20:51:08 2024 -0300

    preload context in site fields

commit a3afaacc67a9d748cfd42ecbeb7b2d302c3560b2
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 20:39:42 2024 -0300

    test passing pending refactor

commit 13de5017f654c8d82b1ba7beb01066a9c22f19fc
Author: facundoolano <facundo.olano@gmail.com>
Date:   Tue Feb 13 20:18:07 2024 -0300

    add (failing) archive test

commands/commands.go

@@ -45,7 +45,7 @@ func Build() error {
 			os.MkdirAll(targetPath, FILE_RW_MODE)
 		} else {
 
-			if templ, ok := site.TemplateIndex[path]; ok {
+			if templ, ok := site.Templates[path]; ok {
 				// if a template was found at source, render it
 				content, err := site.Render(templ)
 				if err != nil {

site/site.go

@@ -2,11 +2,14 @@ package site
 
 import (
 	"fmt"
-	"github.com/facundoolano/blorg/templates"
 	"io/fs"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
+	"time"
+
+	"github.com/facundoolano/blorg/templates"
 )
 
 // TODO review build and other commands and think what can be brought over here.
@@ -14,19 +17,20 @@ import (
 type Site struct {
 	config  map[string]string // may need to make this interface{} if config gets sophisticated
 	layouts map[string]templates.Template
-	posts   []templates.Template
-	pages   []templates.Template
-	tags    map[string]*templates.Template
+	posts   []map[string]interface{}
+	pages   []map[string]interface{}
+	tags    map[string][]map[string]interface{}
 
-	TemplateIndex map[string]*templates.Template
+	Templates map[string]*templates.Template
 }
 
 func Load(srcDir string, layoutsDir string) (*Site, error) {
 	// TODO load config from config.yml
 	site := Site{
-		layouts:       make(map[string]templates.Template),
-		TemplateIndex: make(map[string]*templates.Template),
-		config:        make(map[string]string),
+		layouts:   make(map[string]templates.Template),
+		Templates: make(map[string]*templates.Template),
+		config:    make(map[string]string),
+		tags:      make(map[string][]map[string]interface{}),
 	}
 
 	if err := site.loadLayouts(layoutsDir); err != nil {
@@ -74,7 +78,7 @@ func (site *Site) loadTemplates(srcDir string) error {
 		return fmt.Errorf("couldn't read %s", srcDir)
 	}
 
-	return filepath.WalkDir(srcDir, func(path string, entry fs.DirEntry, err error) error {
+	err = filepath.WalkDir(srcDir, func(path string, entry fs.DirEntry, err error) error {
 		if !entry.IsDir() {
 			templ, err := templates.Parse(path)
 			// if sometime fails or this is not a template, skip
@@ -82,23 +86,58 @@ func (site *Site) loadTemplates(srcDir string) error {
 				return err
 			}
 
+			// set site related (?) metadata. Not sure if this should go elsewhere
+			relPath, _ := filepath.Rel(srcDir, path)
+			templ.Metadata["path"] = relPath
+			templ.Metadata["url"] = "/" + strings.TrimSuffix(relPath, ".html")
+			templ.Metadata["dir"] = "/" + filepath.Base(relPath)
+
 			// posts are templates that can be chronologically sorted --that have a date.
 			// the rest are pages.
 			if _, ok := templ.Metadata["date"]; ok {
-				site.posts = append(site.posts, *templ)
-			} else {
-				site.pages = append(site.pages, *templ)
-			}
-			site.TemplateIndex[path] = templ
+				site.posts = append(site.posts, templ.Metadata)
 
-			// TODO load tags
+				// also add to tags index
+				if tags, ok := templ.Metadata["tags"]; ok {
+					for _, tag := range tags.([]interface{}) {
+						tag := tag.(string)
+						site.tags[tag] = append(site.tags[tag], templ.Metadata)
+					}
+				}
+
+			} else {
+				site.pages = append(site.pages, templ.Metadata)
+			}
+			site.Templates[path] = templ
 		}
 		return nil
 	})
+
+	if err != nil {
+		return err
+	}
+
+	// sort posts by reverse chronological order
+	Compare := func(a map[string]interface{}, b map[string]interface{}) int {
+		return b["date"].(time.Time).Compare(a["date"].(time.Time))
+	}
+	slices.SortFunc(site.posts, Compare)
+	for _, posts := range site.tags {
+		slices.SortFunc(posts, Compare)
+	}
+	return nil
 }
 
 func (site Site) Render(templ *templates.Template) (string, error) {
-	ctx := site.baseContext()
+	ctx := map[string]interface{}{
+		"site": map[string]interface{}{
+			"config": site.config,
+			"posts":  site.posts,
+			"tags":   site.tags,
+			"pages":  site.pages,
+		},
+	}
+
 	ctx["page"] = templ.Metadata
 	content, err := templ.Render(ctx)
 	if err != nil {
@@ -120,13 +159,3 @@ func (site Site) Render(templ *templates.Template) (string, error) {
 
 	return content, err
 }
-
-func (site Site) baseContext() map[string]interface{} {
-	return map[string]interface{}{
-		"site": map[string]interface{}{
-			"config": site.config,
-			"posts":  site.posts,
-			"tags":   site.tags,
-		},
-	}
-}

site/site_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestLoadAndRenderTemplates(t *testing.T) {
-	root, src, layouts := newProject()
+	root, layouts, src := newProject()
 	defer os.RemoveAll(root)
 
 	// add two layouts
@@ -40,7 +40,8 @@ date: 2024-01-01
 ---
 <p>Hello world!</p>`
 	file = newFile(src, "hello.html", content)
-	defer os.Remove(file.Name())
+	helloPath := file.Name()
+	defer os.Remove(helloPath)
 
 	content = `---
 layout: post
@@ -50,7 +51,8 @@ date: 2024-02-01
 ---
 <p>goodbye world!</p>`
 	file = newFile(src, "goodbye.html", content)
-	defer os.Remove(file.Name())
+	goodbyePath := file.Name()
+	defer os.Remove(goodbyePath)
 
 	// add a page (no date)
 	content = `---
@@ -59,7 +61,8 @@ title: about
 ---
 <p>about this site</p>`
 	file = newFile(src, "about.html", content)
-	defer os.Remove(file.Name())
+	aboutPath := file.Name()
+	defer os.Remove(aboutPath)
 
 	// add a static file (no front matter)
 	content = `go away!`
@@ -78,8 +81,7 @@ title: about
 	_, ok = site.layouts["post"]
 	assert(t, ok)
 
-	hello := site.posts[1]
-	content, err = site.Render(&hello)
+	content, err = site.Render(site.Templates[helloPath])
 	assertEqual(t, err, nil)
 	assertEqual(t, content, `<html>
 <head><title>hello world!</title></head>
@@ -90,8 +92,7 @@ title: about
 </body>
 </html>`)
 
-	goodbye := site.posts[0]
-	content, err = site.Render(&goodbye)
+	content, err = site.Render(site.Templates[goodbyePath])
 	assertEqual(t, err, nil)
 	assertEqual(t, content, `<html>
 <head><title>goodbye!</title></head>
@@ -102,8 +103,7 @@ title: about
 </body>
 </html>`)
 
-	about := site.pages[0]
-	content, err = site.Render(&about)
+	content, err = site.Render(site.Templates[aboutPath])
 	assertEqual(t, err, nil)
 	assertEqual(t, content, `<html>
 <head><title>about</title></head>
@@ -115,10 +115,117 @@ title: about
 }
 
 func TestRenderArchive(t *testing.T) {
-	// TODO
+	root, layouts, src := newProject()
+	defer os.RemoveAll(root)
+
+	content := `---
+title: hello world!
+date: 2024-01-01
+---
+<p>Hello world!</p>`
+	file := newFile(src, "hello.html", content)
+	defer os.Remove(file.Name())
+
+	content = `---
+title: goodbye!
+date: 2024-02-01
+---
+<p>goodbye world!</p>`
+	file = newFile(src, "goodbye.html", content)
+	defer os.Remove(file.Name())
+
+	content = `---
+title: an oldie!
+date: 2023-01-01
+---
+<p>oldie</p>`
+	file = newFile(src, "an-oldie.html", content)
+	defer os.Remove(file.Name())
+
+	// add a page (no date)
+	content = `---
+---
+<ul>{% for post in site.posts %}
+<li>{{ post.date | date: "%Y-%m-%d" }} <a href="{{ post.url }}">{{post.title}}</a></li>{%endfor%}
+</ul>`
+
+	file = newFile(src, "about.html", content)
+	defer os.Remove(file.Name())
+
+	site, err := Load(src, layouts)
+	content, err = site.Render(site.Templates[file.Name()])
+	assertEqual(t, err, nil)
+	assertEqual(t, content, `<ul>
+<li>2024-02-01 <a href="/goodbye">goodbye!</a></li>
+<li>2024-01-01 <a href="/hello">hello world!</a></li>
+<li>2023-01-01 <a href="/an-oldie">an oldie!</a></li>
+</ul>`)
 }
 
 func TestRenderTags(t *testing.T) {
+	root, layouts, src := newProject()
+	defer os.RemoveAll(root)
+
+	content := `---
+title: hello world!
+date: 2024-01-01
+tags: [web, software]
+---
+<p>Hello world!</p>`
+	file := newFile(src, "hello.html", content)
+	defer os.Remove(file.Name())
+
+	content = `---
+title: goodbye!
+date: 2024-02-01
+tags: [web]
+---
+<p>goodbye world!</p>`
+	file = newFile(src, "goodbye.html", content)
+	defer os.Remove(file.Name())
+
+	content = `---
+title: an oldie!
+date: 2023-01-01
+tags: [software]
+---
+<p>oldie</p>`
+	file = newFile(src, "an-oldie.html", content)
+	defer os.Remove(file.Name())
+
+	// add a page (no date)
+	content = `---
+---
+{% for tag in site.tags %}<h1>{{tag[0]}}</h1>{% for post in tag[1] %}
+{{post.title}}
+{% endfor %}
+{% endfor %}
+`
+
+	file = newFile(src, "about.html", content)
+	defer os.Remove(file.Name())
+
+	site, err := Load(src, layouts)
+	content, err = site.Render(site.Templates[file.Name()])
+	assertEqual(t, err, nil)
+	assertEqual(t, content, `<h1>software</h1>
+hello world!
+
+an oldie!
+
+<h1>web</h1>
+goodbye!
+
+hello world!
+
+`)
+}
+
+func TestRenderPagesInDir(t *testing.T) {
+	// TODO
+}
+
+func TestRenderArchiveWithExcerpts(t *testing.T) {
 	// TODO
 }
 

templates/templates.go

@@ -52,7 +52,7 @@ func Parse(path string) (*Template, error) {
 		return nil, errors.New("front matter not closed")
 	}
 
-	var metadata map[string]interface{}
+	metadata := make(map[string]interface{})
 	if len(yamlContent) != 0 {
 		err := yaml.Unmarshal([]byte(yamlContent), &metadata)
 		if err != nil {