Switch per-site configuration to Lua (fix #31)

matrix.go

@@ -123,7 +123,7 @@ func initMatrix() {
 			return text + "🔴 Failed to get sites!"
 		}
 		for _, site := range sites {
-			text = fmt.Sprintf("%s- %s\n", text, site.name)
+			text = fmt.Sprintf("%s- %s\n", text, site.getName())
 		}
 		if len(sites) == 0 {
 			text = text + "*No sites found*"

site.go

@@ -2,7 +2,6 @@
 package main
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"log"
@@ -12,6 +11,7 @@ import (
 	"syscall"
 
 	"github.com/gogs/git-module"
+	lua "github.com/yuin/gopher-lua"
 )
 
 // Site contains information and methods used for management of a Lapis site.
@@ -20,7 +20,7 @@ type Site struct {
 	config SiteConfig
 }
 
-// SiteConfig contains parsed data from a site's configuration file
+// SiteConfig contains parsed data from a site's configuration file.
 type SiteConfig struct {
 	port int64
 	name string
@@ -42,30 +42,33 @@ func getSite(name string) (Site, bool, error) {
 	}
 }
 
-// getConfig parses a site's configuration file
+// getConfig parses a site's configuration file.
 func (site *Site) getConfig() (bool, error) {
-	path := fmt.Sprintf("%s/%s/deploy_config.json", configuration.sites_dir, site.name)
+	path := fmt.Sprintf("%s/%s/deploy_config.lua", configuration.sites_dir, site.name)
+	// Make sure config file exists
 	if exists, _ := fileExists(path); !exists {
 		return false, nil
 	}
-	file, _ := os.Open(path)
-	var data map[string]interface{}
-	err := json.NewDecoder(file).Decode(&data)
-	if err != nil {
-		log.Panic("Failed to parse config:", err)
-	}
-	file.Close()
+	// Lua state setup
+	L := lua.NewState()
+	defer L.Close()
+
+	L.DoFile(path)     // Load the config
+	table := L.Get(-1) // Get the table returned by the config file
+
 	// Parse the config
 	var config SiteConfig
-	config.name = data["name"].(string)
-	config.port = int64(data["port"].(float64))
+	log.Printf("Loading per-site config %s", path)
+
+	getStringFromTable(L, table, "name", &config.name)
+	getIntFromTable(L, table, "port", &config.port)
 
 	site.config = config
 
 	return true, nil
 }
 
-// getName gets a website's configured name (falls back to technical name if one isn't configured)
+// getName gets a website's configured name (falls back to technical name if one isn't configured).
 func (site *Site) getName() string {
 	if site.config.name == "" {
 		return site.name