From e319e1062d62ce2f5965f191e0e30802b0bd97fd Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@trenchant.org>
Date: Sat, 7 Jul 2018 10:39:09 -0700
Subject: yaml config file, cmd line overrides

---
 config/config.go | 35 +++++++++++++++++++++++++++--------
 main.go          | 44 +++++++++++++++++++++++++++++++++-----------
 2 files changed, 60 insertions(+), 19 deletions(-)

diff --git a/config/config.go b/config/config.go
index 91ffd87..f9dd386 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,28 +1,47 @@
 package config
 
 import (
-	"encoding/json"
+	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"log"
 )
 
 type Settings struct {
-	DBFile         string `json:"db"`
-	Port           int    `json:"web"`
-	Username       string `json:"username"`
-	DigestPassword string `json:"password"`
-	ProxyImages    bool   `json:"proxy_images"`
+	DBFile         string `yaml:"database"`
+	Port           int    `yaml:"http"`
+	DigestPassword string `yaml:"password"`
+	CrawlMinutes   int    `yaml:"minutes"`
+	ProxyImages    bool   `yaml:"imageproxy"`
 }
 
 var Config Settings
 
-func Read(filename string) {
+func Init(filename string) {
+	if filename != "" {
+		readConfig(filename)
+	}
+	addDefaults()
+}
+
+func readConfig(filename string) {
 	file, e := ioutil.ReadFile(filename)
 	if e != nil {
 		log.Fatal("Can not read config file\n", e)
 	}
-	e = json.Unmarshal(file, &Config)
+	e = yaml.Unmarshal(file, &Config)
 	if e != nil {
 		log.Fatal("Config read error\n", e)
 	}
 }
+
+func addDefaults() {
+	if Config.DBFile == "" {
+		Config.DBFile = "neko.db"
+	}
+	if Config.Port == 0 {
+		Config.Port = 4994
+	}
+	if Config.CrawlMinutes == 0 {
+		Config.CrawlMinutes = 60
+	}
+}
diff --git a/main.go b/main.go
index b55cd2b..6908ff9 100644
--- a/main.go
+++ b/main.go
@@ -17,23 +17,26 @@ var Version, Build string
 
 func main() {
 	var help, update, verbose, proxyImages bool
-	var dbfile, newFeed, export, password string
+	var configFile, dbfile, newFeed, export, password string
 	var port, minutes int
 
-	// commands // no command tries to run the web server
+	// config file
+	flag.StringVarP(&configFile, "config", "c", "", "read configuration from file")
+
+	// commands -- no command runs the web server
 	flag.BoolVarP(&help, "help", "h", false, "print usage information")
 	flag.BoolVarP(&update, "update", "u", false, "fetch feeds and store new items")
 	flag.StringVarP(&newFeed, "add", "a", "", "add the feed at URL `http://example.com/rss.xml`")
 	flag.StringVarP(&export, "export", "x", "", "export feed. format required: text, json or opml")
 
-	// options with sensible defaults
-	flag.StringVarP(&dbfile, "database", "d", "neko.db", "sqlite database file")
-	flag.IntVarP(&port, "http", "s", 4994, "HTTP port to serve on")
-	flag.IntVarP(&minutes, "minutes", "m", 60, "minutes between crawling feeds")
+	// options -- defaults are set in config/main.go and overridden by cmd line
+	flag.StringVarP(&dbfile, "database", "d", "", "sqlite database file")
+	flag.IntVarP(&port, "http", "s", 0, "HTTP port to serve on")
+	flag.IntVarP(&minutes, "minutes", "m", 0, "minutes between crawling feeds")
 	flag.BoolVarP(&proxyImages, "imageproxy", "i", false, "rewrite and proxy all image requests for privacy (experimental)")
 	flag.BoolVarP(&verbose, "verbose", "v", false, "verbose output")
 
-	// passwords on command line are bad
+	// passwords on command line are bad, you should use the config file
 	flag.StringVarP(&password, "password", "p", "", "password to access web interface")
 	flag.Parse()
 
@@ -43,11 +46,30 @@ func main() {
 		return
 	}
 
+	// reads config if present and sets defaults
+	config.Init(configFile)
+
+	// override config file with flags if present
 	vlog.VERBOSE = verbose
-	config.Config.DBFile = dbfile
-	config.Config.Port = port
-	config.Config.ProxyImages = proxyImages
-	config.Config.DigestPassword = password
+	if dbfile != "" {
+		config.Config.DBFile = dbfile
+	}
+
+	if port != 0 {
+		config.Config.Port = port
+	}
+
+	if password != "" {
+		config.Config.DigestPassword = password
+	}
+
+	if minutes != 0 {
+		config.Config.CrawlMinutes = minutes
+	}
+
+	if proxyImages != false {
+		config.Config.ProxyImages = proxyImages
+	}
 
 	models.InitDB()
 
-- 
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