Use XDG_CONFIG_HOME for config and theme (#34)

* default config and theme to XDG_CONFIG_HOME
* copy default theme and config to XDG_CONFIG_HOME if they do not exist

README.md

@@ -20,8 +20,10 @@ You can also specify theme, configuration and database manually.
 ./gorss -config gorss.conf -theme default.theme -db mydb.db
 ```
 
-Gorss expect to have `gorss.conf` and `default.theme` in the same directory as `gorss` itself if not
-starting it with parameters as above.
+If either the configuration or theme files are not specified, gorss will attempt
+to use`$XDG_CONFIG_HOME/gorss/gorss.conf` and
+`$XDG_CONFIG_HOME/gorss/themes/default.theme`, respectively.  These files will be
+created from the defaults if not present.
 
 To build and run use the makefile.
 ```

cmd/gorss/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"flag"
 	"fmt"
 	"log"
@@ -55,6 +56,13 @@ func main() {
 		s := conf.QueryConfig(defaultConfig)
 		if s != "" {
 			cfg = s
+		} else {
+			cfg = fmt.Sprintf("%s/%s", configHome, defaultConfig)
+			// check if default config exists, copy if not
+			_, err := os.Stat(cfg)
+			if errors.Is(err, os.ErrNotExist) {
+				internal.CopyFile(defaultConfig, cfg)
+			}
 		}
 	}
 
@@ -63,6 +71,17 @@ func main() {
 		s := conf.QueryConfig(defaultTheme)
 		if s != "" {
 			theme = s
+		} else {
+			theme = fmt.Sprintf("%s/%s", configHome, defaultTheme)
+			// check if default config exists, copy if not
+			_, err := os.Stat(theme)
+			if errors.Is(err, os.ErrNotExist) {
+				themeDir := fmt.Sprintf("%s/%s", configHome, "themes")
+				if err := os.Mkdir(themeDir, os.ModePerm); err != nil {
+					log.Printf("Failed to create dir: %s\n", themeDir)
+				}
+				internal.CopyFile(defaultTheme, theme)
+			}
 		}
 	}
 

internal/util.go

@@ -0,0 +1,33 @@
+package internal
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+// copy file from src to dst
+func CopyFile(src, dst string) (int64, error) {
+	sourceFileStat, err := os.Stat(src)
+	if err != nil {
+		return 0, err
+	}
+
+	if !sourceFileStat.Mode().IsRegular() {
+		return 0, fmt.Errorf("%s is not a regular file", src)
+	}
+
+	source, err := os.Open(src)
+	if err != nil {
+		return 0, err
+	}
+	defer source.Close()
+
+	destination, err := os.Create(dst)
+	if err != nil {
+		return 0, err
+	}
+	defer destination.Close()
+	nBytes, err := io.Copy(destination, source)
+	return nBytes, err
+}