pass config all the way down to gen'd code; use templates instead of strings

Author: clipperhouse

execute.go

@@ -16,7 +16,7 @@ import (
 // If no custom file exists, it executes the passed 'standard' func.
 //
 // If the custom file exists, new files are written to a temp directory and executed via `go run` in the shell.
-func execute(standard func() error, c config, imports typewriter.ImportSpecSet, body string) error {
+func execute(standard func(c config) error, c config, imports typewriter.ImportSpecSet, body *template.Template) error {
 	if importsSrc, err := os.Open(c.customName); err == nil {
 		defer importsSrc.Close()
 
@@ -25,13 +25,13 @@ func execute(standard func() error, c config, imports typewriter.ImportSpecSet,
 	}
 
 	// do it the regular way
-	return standard()
+	return standard(c)
 }
 
 // executeCustom creates a temp directory, copies importsSrc into it and generates a main() using the passed imports and body.
 //
 // `go run` is then called on those files via os.Command.
-func executeCustom(importsSrc io.Reader, c config, imports typewriter.ImportSpecSet, body string) error {
+func executeCustom(importsSrc io.Reader, c config, imports typewriter.ImportSpecSet, body *template.Template) error {
 	temp, err := getTempDir()
 	if err != nil {
 		return err
@@ -65,7 +65,7 @@ func executeCustom(importsSrc io.Reader, c config, imports typewriter.ImportSpec
 	}
 
 	// write the body, usually a main()
-	if _, err := main.WriteString(body); err != nil {
+	if err := body.Execute(main, c); err != nil {
 		return err
 	}
 

list.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"text/template"
 
 	"github.com/clipperhouse/typewriter"
 )
@@ -13,7 +14,7 @@ func list(c config) error {
 		typewriter.ImportSpec{Path: "github.com/clipperhouse/typewriter"},
 	)
 
-	listFunc := func() error {
+	listFunc := func(c config) error {
 		app, err := typewriter.NewApp("+gen")
 
 		if err != nil {
@@ -28,10 +29,10 @@ func list(c config) error {
 		return nil
 	}
 
-	return execute(listFunc, c, imports, listBody)
+	return execute(listFunc, c, imports, listTmpl)
 }
 
-const listBody string = `
+var listTmpl = template.Must(template.New("list").Parse(`
 func main() {
 	app, err := typewriter.NewApp("+gen")
 
@@ -45,4 +46,4 @@ func main() {
 		fmt.Println("  " + tw.Name())
 	}
 }
-`
+`))

main.go

@@ -22,7 +22,7 @@ func main() {
 	err = runMain(os.Args)
 }
 
-var exitStatusMsg = regexp.MustCompile(`^exit status \d+$`)
+var exitStatusMsg = regexp.MustCompile("^exit status \\d+$")
 
 func runMain(args []string) error {
 	c := defaultConfig

run.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"text/template"
 
 	"github.com/clipperhouse/typewriter"
 )
@@ -11,14 +12,15 @@ func run(c config) error {
 	imports := typewriter.NewImportSpecSet(
 		typewriter.ImportSpec{Path: "fmt"},
 		typewriter.ImportSpec{Path: "os"},
+		typewriter.ImportSpec{Path: "regexp"},
 		typewriter.ImportSpec{Path: "github.com/clipperhouse/typewriter"},
 	)
 
-	return execute(runStandard, c, imports, runBody)
+	return execute(runStandard, c, imports, runTmpl)
 }
 
-func runStandard() (err error) {
-	app, err := typewriter.NewApp("+gen")
+func runStandard(c config) (err error) {
+	app, err := c.Config.NewApp("+gen")
 
 	if err != nil {
 		return err
@@ -49,16 +51,28 @@ func runStandard() (err error) {
 	return nil
 }
 
-const runBody string = `
+var runTmpl = template.Must(template.New("run").Parse(`
+
+var exitStatusMsg = regexp.MustCompile("^exit status \\d+$")
+
 func main() {
-	if err := gen(); err != nil {
-		os.Stderr.WriteString(err.Error() + "\n")
-		os.Exit(1)
-	}
+	var err error
+
+	defer func() {
+		if err != nil {
+			if !exitStatusMsg.MatchString(err.Error()) {
+				os.Stderr.WriteString(err.Error() + "\n")
+			}
+			os.Exit(1)
+		}
+	}()
+
+	err = run()
 }
 
-func gen() error {
-	app, err := typewriter.NewApp("+gen")
+func run() error {
+	config := {{ printf "%#v" .Config }}
+	app, err := config.NewApp("+gen")
 
 	if err != nil {
 		return err
@@ -88,4 +102,4 @@ func gen() error {
 
 	return nil
 }
-`
+`))