misc linter-suggested simplifications

cmd/multibuild/multibuild.go

@@ -62,15 +62,15 @@ func targetList() ([]target, error) {
 
 // Returns the binary name/path that `go build` would produce.
 func determineTargetName(args []string) (string, error) {
-	for i := 0; i < len(args); i++ {
+	for i := range args {
 		arg := args[i]
 
 		if arg == "-o" && i+1 < len(args) {
 			return args[i+1], nil
 		}
 
-		if strings.HasPrefix(arg, "-o=") {
-			return strings.TrimPrefix(arg, "-o="), nil
+		if after, ok := strings.CutPrefix(arg, "-o="); ok {
+			return after, nil
 		}
 	}
 
@@ -99,7 +99,7 @@ func determineTargetName(args []string) (string, error) {
 }
 
 func displayUsageAndExit(self string) {
-	fmt.Fprintln(os.Stderr, fmt.Sprintf("usage: %s [-o output] [build flags] [packages]", self))
+	fmt.Fprintf(os.Stderr, "usage: %s [-o output] [build flags] [packages]\n", self)
 	fmt.Fprintln(os.Stderr, "multibuild is a thin wrapper around 'go build'.")
 	fmt.Fprintln(os.Stderr, "For documentation on multibuild's configuration, see https://github.com/rburchell/multibuild")
 	fmt.Fprintln(os.Stderr, "Otherwise, run 'go help build' for command line flags.")

cmd/multibuild/options.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"slices"
 	"strings"
 )
 
@@ -62,13 +63,7 @@ func (this options) buildTargetList(targets []target) ([]target, error) {
 
 	// Check includes still present
 	for _, inc := range this.Include {
-		found := false
-		for _, t := range targets {
-			if inc.matches(t) {
-				found = true
-				break
-			}
-		}
+		found := slices.ContainsFunc(targets, inc.matches)
 		if !found {
 			return nil, fmt.Errorf("multibuild: required target %q was not found, or was excluded", inc)
 		}

cmd/multibuild/options_test.go

@@ -5,6 +5,7 @@ package main
 
 import (
 	"os"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -264,13 +265,7 @@ func TestScanBuildDir_ExcludeDefaultCGO(t *testing.T) {
 	// Unset CGO_ENABLED
 	os.Setenv("CGO_ENABLED", "0")
 	opts, _ := scanBuildDir([]string{file})
-	found := false
-	for _, x := range opts.Exclude {
-		if x == "android/*" {
-			found = true
-			break
-		}
-	}
+	found := slices.Contains(opts.Exclude, "android/*")
 	if !found {
 		t.Errorf("expected android/* to be excluded when CGO_ENABLED=0, got excludes %v", opts.Exclude)
 	}

cmd/multibuild/utils.go

@@ -8,7 +8,7 @@ import (
 	"os"
 )
 
-func fatal(format string, args ...interface{}) {
+func fatal(format string, args ...any) {
 	format += "\n"
 	fmt.Fprintf(os.Stderr, format, args...)
 	os.Exit(1)