From aedca76587982d5e1c9f5042eb7b3fb138667784 Mon Sep 17 00:00:00 2001
From: Colin P. Mccabe <colin@cmccabe.xyz>
Date: Wed, 19 Dec 2018 16:10:09 -0800
Subject: [PATCH] Some improvements to audiobooker

---
 Makefile       |    7 +++++--
 audiobooker.go |   43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index b6bab15..a5aeef5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,9 @@
 CFLAGS=-Wall -O2
 
-all:		bytor errno_speak show_default_sockopts simple_time vimstart hexconv
+all:		audiobooker bytor errno_speak show_default_sockopts simple_time vimstart hexconv
+
+audiobooker:
+	go build audiobooker.go
 
 bytor:
 	go build bytor.go
@@ -16,4 +19,4 @@ vimstart:	vimstart.o
 hexconv:	hexconv.o
 
 clean:
-	rm -rf errno_speak show_default_sockopts simple_time vimstart hexconv *.o
+	rm -rf bytor errno_speak show_default_sockopts simple_time vimstart hexconv *.o
diff --git a/audiobooker.go b/audiobooker.go
index c330c89..7116e3f 100644
--- a/audiobooker.go
+++ b/audiobooker.go
@@ -7,10 +7,12 @@ import (
 	"path/filepath"
 	"io/ioutil"
 	"fmt"
+	"math"
 	"os"
 	"sort"
 	"path"
 	"strings"
+	"strconv"
 )
 
 const MP3_SUFFIX = ".mp3"
@@ -120,6 +122,42 @@ func (out *OutDir) CopyFile(src string) error {
 	return err
 }
 
+func (out *OutDir) GetNumDigitsNeeded() int {
+	i := math.Log10(float64(out.nextIndex))
+	j := math.Floor(i)
+	if j < i {
+		return 1 + int(j)
+	} else {
+		return int(j)
+	}
+}
+
+func (out *OutDir) RenameOutputFiles() error {
+	numDigitsNeeded := out.GetNumDigitsNeeded()
+	fs := "%0" + strconv.Itoa(numDigitsNeeded) + "d" + MP3_SUFFIX
+	d, err := os.Open(out.outPath); if err != nil {
+		return fmt.Errorf("Unable to open directory %s: %s", out.outPath, err.Error())
+	}
+	defer d.Close()
+	names, err := d.Readdirnames(0); if err != nil && err != io.EOF {
+		return fmt.Errorf("Unable to readdir %s: %s", out.outPath, err.Error())
+	}
+	for i := range names {
+		index := -1
+		_, err = fmt.Sscanf(names[i], "%d", &index); if err != nil {
+			return fmt.Errorf("Unable to parse file name %s", names[i])
+		}
+		newName := fmt.Sprintf(fs, index)
+		src := path.Join(out.outPath, names[i])
+		dst := path.Join(out.outPath, newName)
+		err = os.Rename(src, dst)
+		if err != nil {
+			return fmt.Errorf("Failed to rename %s to %s: %s", src, dst, err.Error())
+		}
+	}
+	return nil
+}
+
 type InContext struct {
 	inPath string // The original input file path.
 	tempDir string // The path to the temporary directory.
@@ -225,5 +263,10 @@ func main() {
 		fmt.Printf("Split %s into %d file(s)\n", inPaths[i], len(paths))
 		totalFiles += int64(len(paths))
 	}
+	err = outDir.RenameOutputFiles()
+	if err != nil {
+		fmt.Printf("Error renaming output files in %s: %s", outDir.outPath, err.Error())
+		os.Exit(1)
+	}
 	fmt.Printf("Processed %d total file(s)\n", totalFiles)
 }
-- 
1.6.6.rc1.39.g9a42