Refactor for better modularity (share more code among edit functions, rename "offline" package to "backend"

src/backend/init.go

@@ -0,0 +1,69 @@
+package backend
+
+import (
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// TempInit ensures libmutton directories exist and writes the libmutton configuration file
+func TempInit(configFileMap map[string]string) {
+	// create EntryRoot and ConfigDir
+	dirInit()
+
+	// remove existing config file
+	removeFile(ConfigPath)
+
+	if configFileMap["textEditor"] == "" {
+		configFileMap["textEditor"] = textEditorFallback()
+	}
+
+	// create and write config file
+	configFile, _ := os.OpenFile(ConfigPath, os.O_CREATE|os.O_WRONLY, 0600)
+	defer configFile.Close()
+	configFile.WriteString("[LIBMUTTON]\n")
+	for key, value := range configFileMap {
+		configFile.WriteString(key + " = " + value + "\n")
+	}
+
+	os.Exit(0)
+}
+
+// GpgUIDListGen generates a list of all GPG key IDs on the system and returns them as a slice of strings
+func GpgUIDListGen() []string {
+	cmd := exec.Command("gpg", "-k", "--with-colons")
+	gpgOutputBytes, _ := cmd.Output()
+	gpgOutputLines := strings.Split(string(gpgOutputBytes), "\n")
+	var uidSlice []string
+	for _, line := range gpgOutputLines {
+		if strings.HasPrefix(line, "uid") {
+			uid := strings.Split(line, ":")[9]
+			uidSlice = append(uidSlice, uid)
+		}
+	}
+	return uidSlice
+}
+
+// GpgKeyGen generates a new GPG key and returns the key ID
+func GpgKeyGen() string {
+	gpgGenTempFile := CreateTempFile()
+	defer os.Remove(gpgGenTempFile.Name())
+
+	// create and write gpg-gen file
+	unixTime := strconv.FormatInt(time.Now().Unix(), 10)
+	gpgGenTempFile.WriteString(strings.Join([]string{"Key-Type: eddsa", "Key-Curve: ed25519", "Key-Usage: sign", "Subkey-Type: ecdh", "Subkey-Curve: cv25519", "Subkey-Usage: encrypt", "Name-Real: libmutton-" + unixTime, "Name-Comment: gpg-libmutton", "Name-Email: github.com/rwinkhart/libmutton", "Expire-Date: 0"}, "\n"))
+
+	// close gpg-gen file
+	gpgGenTempFile.Close()
+
+	// generate GPG key based on gpg-gen file
+	cmd := exec.Command("gpg", "-q", "--batch", "--generate-key", gpgGenTempFile.Name())
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+	cmd.Run()
+
+	return "libmutton-" + unixTime + " (gpg-libmutton) <github.com/rwinkhart/libmutton>"
+}