feat(pkg/commands): provide ExitCodeError to use in place of os.Exit

gnovm/cmd/gno/lint.go

@@ -20,9 +20,8 @@ import (
 )
 
 type lintCfg struct {
-	verbose       bool
-	rootDir       string
-	setExitStatus int
+	verbose bool
+	rootDir string
 	// min_confidence: minimum confidence of a problem to print it (default 0.8)
 	// auto-fix: apply suggested fixes automatically.
 }
@@ -48,7 +47,6 @@ func (c *lintCfg) RegisterFlags(fs *flag.FlagSet) {
 
 	fs.BoolVar(&c.verbose, "v", false, "verbose output when lintning")
 	fs.StringVar(&c.rootDir, "root-dir", rootdir, "clone location of github.com/gnolang/gno (gno tries to guess it)")
-	fs.IntVar(&c.setExitStatus, "set-exit-status", 1, "set exit status to 1 if any issues are found")
 }
 
 func execLint(cfg *lintCfg, args []string, io commands.IO) error {
@@ -135,8 +133,8 @@ func execLint(cfg *lintCfg, args []string, io commands.IO) error {
 		// TODO: Add more checkers
 	}
 
-	if hasError && cfg.setExitStatus != 0 {
-		os.Exit(cfg.setExitStatus)
+	if hasError {
+		return commands.ExitCodeError(1)
 	}
 
 	return nil

gnovm/cmd/gno/lint_test.go

@@ -8,25 +8,30 @@ func TestLintApp(t *testing.T) {
 			args:        []string{"lint"},
 			errShouldBe: "flag: help requested",
 		}, {
-			args:                []string{"lint", "--set-exit-status=0", "../../tests/integ/run_main/"},
+			args:                []string{"lint", "../../tests/integ/run_main/"},
 			stderrShouldContain: "./../../tests/integ/run_main: missing 'gno.mod' file (code=1).",
+			errShouldBe:         "exit code: 1",
 		}, {
-			args:                []string{"lint", "--set-exit-status=0", "../../tests/integ/undefined_variable_test/undefined_variables_test.gno"},
+			args:                []string{"lint", "../../tests/integ/undefined_variable_test/undefined_variables_test.gno"},
 			stderrShouldContain: "undefined_variables_test.gno:6: name toto not declared (code=2)",
+			errShouldBe:         "exit code: 1",
 		}, {
-			args:                []string{"lint", "--set-exit-status=0", "../../tests/integ/package_not_declared/main.gno"},
+			args:                []string{"lint", "../../tests/integ/package_not_declared/main.gno"},
 			stderrShouldContain: "main.gno:4: name fmt not declared (code=2).",
+			errShouldBe:         "exit code: 1",
 		}, {
-			args:                []string{"lint", "--set-exit-status=0", "../../tests/integ/several-lint-errors/main.gno"},
+			args:                []string{"lint", "../../tests/integ/several-lint-errors/main.gno"},
 			stderrShouldContain: "../../tests/integ/several-lint-errors/main.gno:5: expected ';', found example (code=2).\n../../tests/integ/several-lint-errors/main.gno:6",
+			errShouldBe:         "exit code: 1",
 		}, {
-			args:                []string{"lint", "--set-exit-status=0", "../../tests/integ/run_main/"},
+			args:                []string{"lint", "../../tests/integ/run_main/"},
 			stderrShouldContain: "./../../tests/integ/run_main: missing 'gno.mod' file (code=1).",
+			errShouldBe:         "exit code: 1",
 		}, {
-			args: []string{"lint", "--set-exit-status=0", "../../tests/integ/minimalist_gnomod/"},
+			args: []string{"lint", "../../tests/integ/minimalist_gnomod/"},
 			// TODO: raise an error because there is a gno.mod, but no .gno files
 		}, {
-			args: []string{"lint", "--set-exit-status=0", "../../tests/integ/invalid_module_name/"},
+			args: []string{"lint", "../../tests/integ/invalid_module_name/"},
 			// TODO: raise an error because gno.mod is invalid
 		},
 

gnovm/cmd/gno/run.go

@@ -163,7 +163,7 @@
 	}
 
 	if hasError {
-		os.Exit(1)
+		return nil, commands.ExitCodeError(1)
 	}
 	return files, nil
 }

gnovm/cmd/gno/test.go

@@ -332,7 +332,7 @@
 		})
 
 		if hasError {
-			os.Exit(1)
+			return commands.ExitCodeError(1)
 		}
 		testPkgName := getPkgNameFromFileset(ifiles)
 

tm2/pkg/commands/command.go

@@ -110,9 +110,17 @@
 // handles the flag.ErrHelp error, ensuring that every command with -h or
 // --help won't show an error message:
 // 'error parsing commandline arguments: flag: help requested'
+//
+// Additionally, any error of type [ErrExitCode] will be handled by exiting with
+// the given status code.
 func (c *Command) Execute(ctx context.Context, args []string) {
 	if err := c.ParseAndRun(ctx, args); err != nil {
-		if !errors.Is(err, flag.ErrHelp) {
+		var ece ExitCodeError
+		switch {
+		case errors.Is(err, flag.ErrHelp): // just exit with 1 (help already printed)
+		case errors.As(err, &ece):
+			os.Exit(int(ece))
+		default:
 			_, _ = fmt.Fprintf(os.Stderr, "%+v\n", err)
 		}
 		os.Exit(1)

tm2/pkg/commands/errors.go

@@ -0,0 +1,16 @@
+package commands
+
+import (
+	"strconv"
+)
+
+// ExitCodeError is an error to terminate the program without printing any error,
+// but passing in the given exit code to os.Exit.
+//
+// [Command.ParseAndRun] will return any ExitCodeError encountered, but
+// [Command.Execute] will handle it and return an appropriate error message.
+type ExitCodeError int
+
+func (e ExitCodeError) Error() string {
+	return "exit code: " + strconv.Itoa(int(e))
+}