mcfg: ensure all usages end in a period when printing help to cli

mcfg/cli.go

@@ -175,8 +175,13 @@ func (cli SourceCLI) printHelp(w io.Writer, pM map[string]Param) {
 			fmt.Fprintf(w, " (Default: %s)", defVal)
 		}
 		fmt.Fprintf(w, "\n")
-		if p.Usage != "" {
-			fmt.Fprintln(w, "\t"+p.Usage)
+		if usage := p.Usage; usage != "" {
+			// make all usages end with a period, because I say so
+			usage = strings.TrimSpace(usage)
+			if !strings.HasSuffix(usage, ".") {
+				usage += "."
+			}
+			fmt.Fprintln(w, "\t"+usage)
 		}
 	}
 	fmt.Fprintf(w, "\n")

mcfg/cli_test.go

@@ -15,8 +15,8 @@ import (
 
 func TestSourceCLIHelp(t *T) {
 	ctx := mctx.New()
-	Int(ctx, "foo", 5, "Test int param")
-	Bool(ctx, "bar", "Test bool param")
+	Int(ctx, "foo", 5, "Test int param  ") // trailing space should be trimmed
+	Bool(ctx, "bar", "Test bool param.")
 	String(ctx, "baz", "baz", "Test string param")
 	RequiredString(ctx, "baz2", "")
 	RequiredString(ctx, "baz3", "")
@@ -33,13 +33,13 @@ func TestSourceCLIHelp(t *T) {
 --baz3 (Required)
 
 --bar (Flag)
-	Test bool param
+	Test bool param.
 
 --baz (Default: "baz")
-	Test string param
+	Test string param.
 
 --foo (Default: 5)
-	Test int param
+	Test int param.
 
 `
 	assert.Equal(t, exp, buf.String())