Add default favicon.ico file (#162)

* Add default favicon.ico file

* Fix typos in README.md

* Move twemoji mushroom attribution

* Unpack default favicon on first wiki startup

Might be a bit over-engineered

files/files.go

@@ -2,10 +2,12 @@
 package files
 
 import (
+	"io"
 	"os"
 	"path/filepath"
 
 	"github.com/bouncepaw/mycorrhiza/cfg"
+	"github.com/bouncepaw/mycorrhiza/static"
 )
 
 var paths struct {
@@ -51,6 +53,10 @@ func InterwikiJSON() string { return paths.interwikiJSON }
 // PrepareWikiRoot ensures all needed directories and files exist and have
 // correct permissions.
 func PrepareWikiRoot() error {
+	isFirstInit := false
+	if _, err := os.Stat(cfg.WikiDir); err != nil && os.IsNotExist(err) {
+		isFirstInit = true
+	}
 	if err := os.MkdirAll(cfg.WikiDir, os.ModeDir|0777); err != nil {
 		return err
 	}
@@ -77,5 +83,41 @@ func PrepareWikiRoot() error {
 	paths.categoriesJSON = filepath.Join(cfg.WikiDir, "categories.json")
 	paths.interwikiJSON = FileInRoot("interwiki.json")
 
+	// Are we initializing the wiki for the first time?
+	if isFirstInit {
+		err := firstTimeInit()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// firstTimeInit takes care of any tasks that only need to happen the first time the wiki is initialized
+func firstTimeInit() error {
+	static.InitFS(StaticFiles())
+
+	defaultFavicon, err := static.FS.Open("icon/mushroom.png")
+	if err != nil {
+		return err
+	}
+
+	defer defaultFavicon.Close()
+
+	outputFileName := filepath.Join(cfg.WikiDir, "static", "favicon.ico")
+
+	outputFile, err := os.Create(outputFileName)
+	if err != nil {
+		return err
+	}
+
+	defer outputFile.Close()
+
+	_, err = io.Copy(outputFile, defaultFavicon)
+	if err != nil {
+		return err
+	}
+
 	return nil
 }

static/icon/README.md

@@ -8,3 +8,6 @@ This is a modified version of https://www.svgrepo.com/svg/232085/rat.
 
 #### `feed`
 This one is from https://upload.wikimedia.org/wikipedia/commons/4/46/Generic_Feed-icon.svg.
+
+#### `mushroom`
+This is the [mushroom emoji](https://github.com/twitter/twemoji/blob/54df6a1/assets/72x72/1f344.png) from Twitter's [twemoji project](https://twemoji.twitter.com/), and is licensed under the [Creative Commons CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).