feat: provide cli flag to specify ssh config path

- use host address instead of alias (IMPORTANT!)
- tested

fixes #83

Signed-off-by: omani <3346207+omani@users.noreply.github.com>

Author: omani

cmd/main.go

@@ -16,6 +16,7 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 
@@ -28,44 +29,82 @@ import (
 )
 
 var (
-	version   = "develop"
-	gitCommit = "unknown"
-)
+	version       = "develop"
+	gitCommit     = "unknown"
+	sshConfigFile string
 
-func main() {
-	log, err := logger.New("LAZYSSH")
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
+	rootCmd = &cobra.Command{
+		Use:   ui.AppName,
+		Short: "Lazy SSH server picker TUI",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			log, err := logger.New("LAZYSSH")
+			if err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
 
-	//nolint:errcheck // log.Sync may return an error which is safe to ignore here
-	defer log.Sync()
+			//nolint:errcheck // log.Sync may return an error which is safe to ignore here
+			defer log.Sync()
 
-	home, err := os.UserHomeDir()
-	if err != nil {
-		log.Errorw("failed to get user home directory", "error", err)
-		//nolint:gocritic // exitAfterDefer: ensure immediate exit on unrecoverable error
-		os.Exit(1)
-	}
-	sshConfigFile := filepath.Join(home, ".ssh", "config")
-	metaDataFile := filepath.Join(home, ".lazyssh", "metadata.json")
+			home, err := os.UserHomeDir()
+			if err != nil {
+				log.Errorw("failed to get user home directory", "error", err)
+				// nolint:gocritic // exitAfterDefer: ensure immediate exit on unrecoverable error
+				os.Exit(1)
+			}
 
-	serverRepo := ssh_config_file.NewRepository(log, sshConfigFile, metaDataFile)
-	serverService := services.NewServerService(log, serverRepo)
-	tui := ui.NewTUI(log, serverService, version, gitCommit)
+			if sshConfigFile == "" {
+				sshConfigFile = filepath.Join(home, ".ssh", "config")
+			} else {
+				f, err := os.CreateTemp("", "tmpfile-")
+				if err != nil {
+					log.Fatal(err)
+				}
+
+				// close and remove the temporary file at the end of the program
+				defer f.Close()
+				defer os.Remove(f.Name())
+
+				// write data to the temporary file
+				fd, err := os.Open(sshConfigFile)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error opening file: %v\n", err)
+					os.Exit(1)
+				}
+				defer fd.Close()
+
+				// Read the entire contents at once
+				content, err := io.ReadAll(fd)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "Error reading file: %v\n", err)
+					os.Exit(1)
+				}
+				if _, err := f.WriteString(string(content)); err != nil {
+					log.Fatal(err)
+				}
+
+				sshConfigFile = f.Name()
+			}
+
+			metaDataFile := filepath.Join(home, ".lazyssh", "metadata.json")
+			serverRepo := ssh_config_file.NewRepository(log, sshConfigFile, metaDataFile)
+			serverService := services.NewServerService(log, serverRepo)
+			tui := ui.NewTUI(log, serverService, version, gitCommit)
 
-	rootCmd := &cobra.Command{
-		Use:   ui.AppName,
-		Short: "Lazy SSH server picker TUI",
-		RunE: func(cmd *cobra.Command, args []string) error {
 			return tui.Run()
 		},
 	}
-	rootCmd.SilenceUsage = true
+)
 
+func main() {
 	if err := rootCmd.Execute(); err != nil {
 		_, _ = fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
 }
+
+func init() {
+	rootCmd.PersistentFlags().StringVar(&sshConfigFile, "sshconfig", "", "path to ssh config file (default: ~/.ssh/config)")
+
+	rootCmd.SilenceUsage = true
+}

internal/adapters/ui/handlers.go

@@ -224,7 +224,7 @@ func (t *tui) handleServerConnect() {
 	if server, ok := t.serverList.GetSelectedServer(); ok {
 
 		t.app.Suspend(func() {
-			_ = t.serverService.SSH(server.Alias)
+			_ = t.serverService.SSH(server.Host)
 		})
 		t.refreshServerList()
 	}
@@ -289,7 +289,7 @@ func (t *tui) handleFormCancel() {
 
 func (t *tui) handlePingSelected() {
 	if server, ok := t.serverList.GetSelectedServer(); ok {
-		alias := server.Alias
+		alias := server.Host
 
 		t.showStatusTemp(fmt.Sprintf("Pinging %s…", alias))
 		go func() {
@@ -528,7 +528,7 @@ func (t *tui) showPortForwardForm(server domain.Server) {
 		}
 
 		onlyForward := modeChoices[currentModeIdx] == ForwardModeOnlyForward
-		alias := server.Alias
+		alias := server.Host
 		if onlyForward {
 			t.returnToMain()
 			t.showStatusTemp("Starting port forward…")