basic xonsh support

- Support eval/exec commands.
- Tweak codecov.yaml

Refs: #1018

.codecov.yml

@@ -9,4 +9,4 @@ coverage:
 
 ignore:
   - "cmd/**/*"
-
+  - "cmd"

cmd/aws-sso/eval_cmd.go

@@ -98,6 +98,8 @@ func (cc *EvalCmd) Run(ctx *RunContext) error {
 		} else if runtime.GOOS == "windows" {
 			// powershell Invoke-Expression https://github.com/synfinatic/aws-sso-cli/issues/188
 			fmt.Printf("$Env:%s = \"%s\"\r\n", k, v)
+		} else if os.Getenv("XONSH_VERSION") != "" {
+			fmt.Printf("$%s = '%s'\n", k, v)
 		} else {
 			return fmt.Errorf("%s", "invalid or unsupported shell.  Please file a bug!")
 		}
@@ -139,6 +141,9 @@ func unsetEnvVars(ctx *RunContext) error {
 		} else if runtime.GOOS == "windows" {
 			// PowerShell
 			fmt.Printf("$Env:%s = \"\"\r\n", e)
+		} else if os.Getenv("XONSH_VERSION") != "" {
+			// xonsh behaves like python
+			fmt.Printf("del $%s\n", e)
 		} else {
 			return fmt.Errorf("invalid or unsupported shell.  Please file a bug!")
 		}
@@ -160,5 +165,6 @@ func isBashLike() bool {
 			return true
 		}
 	}
+
 	return false
 }

cmd/aws-sso/exec_cmd.go

@@ -55,9 +55,14 @@ func (cc *ExecCmd) Run(ctx *RunContext) error {
 		log.Fatal("Unable to continue", "error", err.Error())
 	}
 
-	if runtime.GOOS == "windows" && ctx.Cli.Exec.Cmd == "" {
-		// Windows doesn't set $SHELL, so default to CommandPrompt
-		ctx.Cli.Exec.Cmd = "cmd.exe"
+	if ctx.Cli.Exec.Cmd == "" {
+		if runtime.GOOS == "windows" {
+			// Windows doesn't set $SHELL, so default to CommandPrompt
+			ctx.Cli.Exec.Cmd = "cmd.exe"
+		} else if os.Getenv("XONSH_VERSION") != "" {
+			// Xonsh doesn't set $SHELL, so default to xonsh
+			ctx.Cli.Exec.Cmd = "xonsh"
+		}
 	}
 
 	sci := NewSelectCliArgs(ctx.Cli.Exec.Arn, ctx.Cli.Exec.AccountId, ctx.Cli.Exec.Role, ctx.Cli.Exec.Profile)

docs/commands.md

@@ -109,6 +109,14 @@ you can write the variable to a file:
 
 `aws-sso eval <args> >~/.devcontainer/devcontainer.env`
 
+Shells supported by `eval`:
+
+ * bash
+ * fish
+ * zonsh
+ * zsh
+ * Windows PowerShell
+
 Flags:
 
  * `--arn <arn>`, `-a` -- ARN of role to assume