Add support for specifying a configuration file

cmd/mop/main.go

@@ -5,11 +5,18 @@
 package main
 
 import (
-	`github.com/mop-tracker/mop`
-	`github.com/nsf/termbox-go`
-	`time`
+	"flag"
+	"os/user"
+	"path"
+	"time"
+
+	"github.com/mop-tracker/mop"
+	"github.com/nsf/termbox-go"
 )
 
+// File name in user's home directory where we store the settings.
+const defaultProfile = `.moprc`
+
 const help = `Mop v0.2.0 -- Copyright (c) 2013-2016 by Michael Dvorkin. All Rights Reserved.
 NO WARRANTIES OF ANY KIND WHATSOEVER. SEE THE LICENSE FILE FOR DETAILS.
 
@@ -119,6 +126,14 @@ func main() {
 	screen := mop.NewScreen()
 	defer screen.Close()
 
-	profile := mop.NewProfile()
+	usr, err := user.Current()
+	if err != nil {
+		panic(err)
+	}
+
+	profileName := flag.String("profile", path.Join(usr.HomeDir, defaultProfile), "path to profile")
+	flag.Parse()
+
+	profile := mop.NewProfile(*profileName)
 	mainLoop(screen, profile)
 }

profile.go

@@ -5,15 +5,11 @@
 package mop
 
 import (
-	`encoding/json`
-	`io/ioutil`
-	`os/user`
-	`sort`
+	"encoding/json"
+	"io/ioutil"
+	"sort"
 )
 
-// File name in user's home directory where we store the settings.
-const moprc = `/.moprc`
-
 // Profile manages Mop program settings as defined by user (ex. list of
 // stock tickers). The settings are serialized using JSON and saved in
 // the ~/.moprc file.
@@ -25,13 +21,14 @@ type Profile struct {
 	Ascending      bool     // True when sort order is ascending.
 	Grouped        bool     // True when stocks are grouped by advancing/declining.
 	selectedColumn int      // Stores selected column number when the column editor is active.
+	filename       string   // Path to the file in which the configuration is stored
 }
 
 // Creates the profile and attempts to load the settings from ~/.moprc file.
 // If the file is not there it gets created with default values.
-func NewProfile() *Profile {
-	profile := &Profile{}
-	data, err := ioutil.ReadFile(profile.defaultFileName())
+func NewProfile(filename string) *Profile {
+	profile := &Profile{filename: filename}
+	data, err := ioutil.ReadFile(filename)
 	if err != nil { // Set default values:
 		profile.MarketRefresh = 12 // Market data gets fetched every 12s (5 times per minute).
 		profile.QuotesRefresh = 5  // Stock quotes get updated every 5s (12 times per minute).
@@ -55,7 +52,7 @@ func (profile *Profile) Save() error {
 		return err
 	}
 
-	return ioutil.WriteFile(profile.defaultFileName(), data, 0644)
+	return ioutil.WriteFile(profile.filename, data, 0644)
 }
 
 // AddTickers updates the list of existing tikers to add the new ones making
@@ -123,12 +120,3 @@ func (profile *Profile) Regroup() error {
 	profile.Grouped = !profile.Grouped
 	return profile.Save()
 }
-
-//-----------------------------------------------------------------------------
-func (profile *Profile) defaultFileName() string {
-	usr, err := user.Current()
-	if err != nil {
-		panic(err)
-	}
-	return usr.HomeDir + moprc
-}