Create a package for config

.gitignore

@@ -0,0 +1 @@
+hypha

cfg/config.go

@@ -0,0 +1,75 @@
+package cfg
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+var (
+	WikiDir        string
+	TemplatesDir   string
+	configJsonPath string
+
+	// Default values that can be overriden in config.json
+	Address           = "127.0.0.1:80"
+	TitleEditTemplate = `Edit %s`
+	TitleTemplate     = `%s`
+	GenericErrorMsg   = `<b>Sorry, something went wrong</b>`
+
+	DefaultTitle      = "MycorrhizaWiki"
+	DefaultHeaderText = `MycorrhizaWiki 🍄`
+	DefaultFooterText = `This website runs <a href="https://github.com/bouncepaw/mycorrhiza">MycorrhizaWiki</a>.`
+	DefaultSidebar    = ""
+	DefaultBodyBottom = ""
+	DefaultContent    = "It is empty here"
+	DefaultStyles     = `
+<link rel="stylesheet" href="/sys/main.css?action=raw">
+`
+)
+
+func InitConfig(wd string) bool {
+	log.Println("WikiDir is", wd)
+	WikiDir = wd
+	TemplatesDir = filepath.Join(filepath.Dir(WikiDir), "templates")
+	configJsonPath = filepath.Join(filepath.Dir(WikiDir), "config.json")
+
+	if _, err := os.Stat(configJsonPath); os.IsNotExist(err) {
+		log.Println("config.json not found, using default values")
+	} else {
+		log.Println("config.json found, overriding default values...")
+		return readConfig()
+	}
+
+	return true
+}
+
+func readConfig() bool {
+	configJsonContents, err := ioutil.ReadFile(configJsonPath)
+	if err != nil {
+		log.Fatal("Error when reading config.json:", err)
+		return false
+	}
+
+	cfg := struct {
+		Address        string `json:"address"`
+		TitleTemplates struct {
+			EditHypha string `json:"edit-hypha"`
+			ViewHypha string `json:"view-hypha"`
+		} `json:"title-templates"`
+	}{}
+
+	err = json.Unmarshal(configJsonContents, &cfg)
+	if err != nil {
+		log.Fatal("Error when parsing config.json:", err)
+		return false
+	}
+
+	Address = cfg.Address
+	TitleEditTemplate = cfg.TitleTemplates.EditHypha
+	TitleTemplate = cfg.TitleTemplates.ViewHypha
+
+	return true
+}

config.go

@@ -1,16 +0,0 @@
-package main
-
-const (
-	TitleEditTemplate = `Edit %s at MycorrhizaWiki`
-	TitleTemplate     = `%s at MycorrhizaWiki`
-	DefaultTitle      = "MycorrhizaWiki"
-	DefaultHeaderText = `MycorrhizaWiki 🍄`
-	DefaultFooterText = `This website runs <a href="https://github.com/bouncepaw/mycorrhiza">MycorrhizaWiki</a>.`
-	DefaultSidebar    = ""
-	DefaultBodyBottom = ""
-	DefaultContent    = "It is empty here"
-	DefaultStyles     = `
-<link rel="stylesheet" href="/sys/main.css?action=raw">
-`
-	GenericErrorMsg = `<b>Sorry, something went wrong</b>`
-)

handlers.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/bouncepaw/mycorrhiza/cfg"
 	"github.com/gorilla/mux"
 )
 
@@ -95,7 +96,7 @@ func getHypha(name string) (*Hypha, bool) {
 	log.Println("Create hypha", name)
 	h := &Hypha{
 		FullName:   name,
-		Path:       filepath.Join(rootWikiDir, name),
+		Path:       filepath.Join(cfg.WikiDir, name),
 		Revisions:  make(map[string]*Revision),
 		parentName: filepath.Dir(name),
 	}
@@ -177,7 +178,7 @@ func HandlerUpdate(w http.ResponseWriter, rq *http.Request) {
 	} else {
 		h = &Hypha{
 			FullName:   vars["hypha"],
-			Path:       filepath.Join(rootWikiDir, vars["hypha"]),
+			Path:       filepath.Join(cfg.WikiDir, vars["hypha"]),
 			Revisions:  make(map[string]*Revision),
 			parentName: filepath.Dir(vars["hypha"]),
 		}

hypha.go

@@ -10,6 +10,8 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+
+	"github.com/bouncepaw/mycorrhiza/cfg"
 )
 
 // `Hypha` represents a hypha. It is the thing MycorrhizaWiki generally serves.
@@ -95,7 +97,7 @@ func ActionEdit(hyphaName string, w http.ResponseWriter) {
 		if err != nil {
 			log.Println("Could not read", newestRev.TextPath)
 			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(GenericErrorMsg))
+			w.Write([]byte(cfg.GenericErrorMsg))
 			return
 		}
 		initContents = string(contents)

main.go

@@ -8,6 +8,7 @@ import (
 	"path/filepath"
 	"time"
 
+	"github.com/bouncepaw/mycorrhiza/cfg"
 	"github.com/gorilla/mux"
 )
 
@@ -36,10 +37,6 @@ func RevInMap(m map[string]string) string {
 	return "0"
 }
 
-// `rootWikiDir` is a directory where all wiki files reside.
-// `templatesDir` is where templates are.
-var rootWikiDir, templatesDir string
-
 // `hyphae` is a map with all hyphae. Many functions use it.
 var hyphae map[string]*Hypha
 
@@ -47,17 +44,15 @@ func main() {
 	if len(os.Args) == 1 {
 		panic("Expected a root wiki pages directory")
 	}
-	// Required so the rootWikiDir hereinbefore does not get redefined.
-	var err error
-	rootWikiDir, err = filepath.Abs(os.Args[1])
+	wikiDir, err := filepath.Abs(os.Args[1])
 	if err != nil {
 		panic(err)
 	}
-	templatesDir = filepath.Join(filepath.Dir(rootWikiDir), "templates")
 
 	log.Println("Welcome to MycorrhizaWiki α")
+	cfg.InitConfig(wikiDir)
 	log.Println("Indexing hyphae...")
-	hyphae = recurFindHyphae(rootWikiDir)
+	hyphae = recurFindHyphae(wikiDir)
 	log.Println("Indexed", len(hyphae), "hyphae. Ready to accept requests.")
 
 	// Start server code. See handlers.go for handlers' implementations.
@@ -123,7 +118,7 @@ func main() {
 
 	srv := &http.Server{
 		Handler: r,
-		Addr:    "127.0.0.1:8000",
+		Addr:    cfg.Address,
 		// Good practice: enforce timeouts for servers you create!
 		WriteTimeout: 15 * time.Second,
 		ReadTimeout:  15 * time.Second,

render.go

@@ -5,12 +5,14 @@ import (
 	"fmt"
 	"path"
 	"text/template"
+
+	"github.com/bouncepaw/mycorrhiza/cfg"
 )
 
 // EditHyphaPage returns HTML page of hypha editor.
 func EditHyphaPage(name, textMime, content, tags string) string {
 	keys := map[string]string{
-		"Title":  fmt.Sprintf(TitleEditTemplate, name),
+		"Title":  fmt.Sprintf(cfg.TitleEditTemplate, name),
 		"Header": renderFromString(name, "Hypha/edit/header.html"),
 	}
 	page := map[string]string{
@@ -34,14 +36,14 @@ func HyphaPage(rev Revision, content string) string {
 
 // HyphaGeneric is used when building renderers for all types of hypha pages
 func HyphaGeneric(name string, content, templatePath string) string {
-	sidebar := DefaultSidebar
+	sidebar := cfg.DefaultSidebar
 	if bside := renderFromMap(map[string]string{
 		"Tree": GetTree(name, true).AsHtml(),
 	}, "Hypha/view/sidebar.html"); bside != "" {
 		sidebar = bside
 	}
 	keys := map[string]string{
-		"Title":   fmt.Sprintf(TitleTemplate, name),
+		"Title":   fmt.Sprintf(cfg.TitleTemplate, name),
 		"Sidebar": sidebar,
 	}
 	return renderBase(renderFromString(content, templatePath), keys)
@@ -53,13 +55,13 @@ func HyphaGeneric(name string, content, templatePath string) string {
 //   keys: map with replaced standart fields
 func renderBase(content string, keys map[string]string) string {
 	page := map[string]string{
-		"Title":      DefaultTitle,
-		"Head":       DefaultStyles,
-		"Sidebar":    DefaultSidebar,
-		"Main":       DefaultContent,
-		"BodyBottom": DefaultBodyBottom,
-		"Header":     renderFromString(DefaultHeaderText, "header.html"),
-		"Footer":     renderFromString(DefaultFooterText, "footer.html"),
+		"Title":      cfg.DefaultTitle,
+		"Head":       cfg.DefaultStyles,
+		"Sidebar":    cfg.DefaultSidebar,
+		"Main":       cfg.DefaultContent,
+		"BodyBottom": cfg.DefaultBodyBottom,
+		"Header":     renderFromString(cfg.DefaultHeaderText, "header.html"),
+		"Footer":     renderFromString(cfg.DefaultFooterText, "footer.html"),
 	}
 	for key, val := range keys {
 		page[key] = val
@@ -70,7 +72,7 @@ func renderBase(content string, keys map[string]string) string {
 
 // renderFromMap applies `data` map to template in `templatePath` and returns the result.
 func renderFromMap(data map[string]string, templatePath string) string {
-	filePath := path.Join(templatesDir, templatePath)
+	filePath := path.Join(cfg.TemplatesDir, templatePath)
 	tmpl, err := template.ParseFiles(filePath)
 	if err != nil {
 		return err.Error()
@@ -84,7 +86,7 @@ func renderFromMap(data map[string]string, templatePath string) string {
 
 // renderFromMap applies `data` string to template in `templatePath` and returns the result.
 func renderFromString(data string, templatePath string) string {
-	filePath := path.Join(templatesDir, templatePath)
+	filePath := path.Join(cfg.TemplatesDir, templatePath)
 	tmpl, err := template.ParseFiles(filePath)
 	if err != nil {
 		return err.Error()

w/config.json

@@ -0,0 +1,7 @@
+{
+	"address": "127.0.0.1:1737", 
+	"title-templates": {
+		"edit-hypha": "Edit %s at MycorrhizaWiki", 
+		"view-hypha": "%s at MycorrhizaWiki"
+	}
+}

walk.go

@@ -7,6 +7,8 @@ import (
 	"path/filepath"
 	"regexp"
 	"strconv"
+
+	"github.com/bouncepaw/mycorrhiza/cfg"
 )
 
 const (
@@ -58,8 +60,8 @@ func scanHyphaDir(fullPath string) (valid bool, possibleSubhyphae []string, meta
 
 // hyphaName gets name of a hypha by stripping path to the hypha in `fullPath`
 func hyphaName(fullPath string) string {
-	// {rootWikiDir}/{the name}
-	return fullPath[len(rootWikiDir)+1:]
+	// {cfg.WikiDir}/{the name}
+	return fullPath[len(cfg.WikiDir)+1:]
 }
 
 // recurFindHyphae recursively searches for hyphae in passed directory path.