Add logging to compile command

compile command writes logs out to the maleeni-compile.log file.
When you use compiler.Compile(), you can choose whether the lexer writes logs or not.

1 files changed, 25 insertions, 2 deletions

diff --git a/cli/cmd/compile.go b/cli/cmd/compile.go
index 23aa120..7815129 100644
--- a/cli/cmd/compile.go
+++ b/cli/cmd/compile.go
@@ -3,8 +3,10 @@ package cmd
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"time"
 
 	"github.com/nihei9/maleeni/compiler"
 	"github.com/nihei9/maleeni/spec"
@@ -22,7 +24,7 @@ func init() {
 	rootCmd.AddCommand(cmd)
 }
 
-func runCompile(cmd *cobra.Command, args []string) error {
+func runCompile(cmd *cobra.Command, args []string) (retErr error) {
 	var lspec *spec.LexSpec
 	{
 		data, err := ioutil.ReadAll(os.Stdin)
@@ -35,7 +37,28 @@ func runCompile(cmd *cobra.Command, args []string) error {
 			return err
 		}
 	}
-	clspec, err := compiler.Compile(lspec)
+	var w io.Writer
+	{
+		f, err := os.OpenFile("maleeni-compile.log", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		w = f
+	}
+	fmt.Fprintf(w, `maleeni compile starts.
+Date time: %v
+---
+`, time.Now().Format(time.RFC3339))
+	defer func() {
+		fmt.Fprintf(w, "---\n")
+		if retErr != nil {
+			fmt.Fprintf(w, "maleeni compile failed: %v\n", retErr)
+		} else {
+			fmt.Fprintf(w, "maleeni compile succeeded.\n")
+		}
+	}()
+	clspec, err := compiler.Compile(lspec, compiler.EnableLogging(w))
 	if err != nil {
 		return err
 	}