Merge pull request #41 from emojisum/refactor_main

main: refactor a bit to get logic out of main and into ./cmd/

README.md

@@ -1,7 +1,6 @@
 # Emojisum
-[![Build Status](https://travis-ci.org/emojisum/emojisum.svg?branch=master)](https://travis-ci.org/emojisum/emojisum)
 
-:pray: :paperclip: An easier way to compare hashes /fingerprints, when dealing human weak link :link: :tada:
+:pray: :paperclip: An easier way to compare hashes /fingerprints, when dealing with the human weak link :link: :tada:
 
 A curated list of 256 emojis that are not entirely similar.
 Using http://www.webpagefx.com/tools/emoji-cheat-sheet/ and http://www.unicode.org/emoji/charts/full-emoji-list.html to compare them.

cmd/coreutils.go

@@ -0,0 +1,61 @@
+package cmd
+
+import (
+	"bufio"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/kyokomi/emoji"
+)
+
+/*
+ParseCoreUtils expects some input like:
+```shell
+$ sha256sum ./tmp.efLuko
+f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb  ./tmp.efLuko
+```
+*/
+func ParseCoreUtils(line string) (filename string, sum []byte, err error) {
+	chunks := strings.SplitN(strings.TrimRight(line, "\n"), "  ", 2)
+	if len(chunks) != 2 {
+		return "", nil, ErrNotCoreUtilsLine
+	}
+	sum, err = hex.DecodeString(chunks[0])
+	if err != nil {
+		return "", nil, err
+	}
+	return chunks[1], sum, nil
+}
+
+// ErrNotCoreUtilsLine when the line to parse is not formated like a coreutils checksum line
+var ErrNotCoreUtilsLine = errors.New("not a coreutils checksum line")
+
+// PrintCoreUtils reads in the content like from `sha25sum ...` and returns
+// in likeness but with emojisum instead.
+// TODO(vb) return a buffer that the caller can choose to print out themselves
+func PrintCoreUtils(rdr io.Reader) error {
+	buf := bufio.NewReader(rdr)
+	for {
+		line, err := buf.ReadString('\n')
+		if err != nil && err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+		name, sum, err := ParseCoreUtils(line)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
+			continue
+		}
+		str := EmojiFromBytes(sum)
+		fmt.Printf("%x  %s\n", sum, name)
+		fmt.Printf("%s  %s\n", str, name)
+		emoji.Print(str)
+		fmt.Printf("  %s\n", name)
+	}
+	return nil
+}

cmd/emoji.go

@@ -0,0 +1,21 @@
+package cmd
+
+import (
+	esum "github.com/emojisum/emojisum/emoji"
+)
+
+// EmojiFromBytes parses the bytes buffer for colon notation and returns the
+// corresponding emoji
+func EmojiFromBytes(buf []byte) string {
+	var ret string
+	for _, b := range buf {
+		for _, e := range esum.Map(b) {
+			// use the first colon notation word and continue
+			if esum.IsColonNotation(e) {
+				ret = ret + e
+				break
+			}
+		}
+	}
+	return ret
+}

cmd/openssl.go

@@ -0,0 +1,68 @@
+package cmd
+
+import (
+	"bufio"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/kyokomi/emoji"
+)
+
+/*
+ParseOpenSSL expects some input like:
+```shell
+$> openssl sha256 tmp.efLuko
+SHA256(tmp.efLuko)= f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb
+```
+*/
+func ParseOpenSSL(line string) (hash, filename string, sum []byte, err error) {
+	if !strings.Contains(line, "(") {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	chunks := strings.SplitN(strings.TrimRight(line, "\n"), ")= ", 2)
+	if len(chunks) != 2 {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	chunksprime := strings.SplitN(chunks[0], "(", 2)
+	if len(chunks) != 2 {
+		return "", "", nil, ErrNotOpenSSLLine
+	}
+	sum, err = hex.DecodeString(chunks[1])
+	if err != nil {
+		return "", "", nil, err
+	}
+	return chunksprime[0], chunksprime[1], sum, nil
+}
+
+// ErrNotOpenSSLLine when the line to parse is not formated like an OpenSSL checksum line
+var ErrNotOpenSSLLine = errors.New("not an openssl checksum line")
+
+// PrintOpenSSL reads in the content like from `openssl sha25 ...` and returns
+// in likeness but with emojisum instead.
+// TODO(vb) return a buffer that the caller can choose to print out themselves
+func PrintOpenSSL(rdr io.Reader) error {
+	buf := bufio.NewReader(rdr)
+	for {
+		line, err := buf.ReadString('\n')
+		if err != nil && err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+		hash, name, sum, err := ParseOpenSSL(line)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
+			continue
+		}
+		str := EmojiFromBytes(sum)
+		fmt.Printf("%s(%s)= %x\n", hash, name, sum)
+		fmt.Printf("%s(%s)= %s\n", hash, name, str)
+		fmt.Printf("%s(%s)= ", hash, name)
+		emoji.Println(str)
+	}
+	return nil
+}

main.go

@@ -1,17 +1,11 @@
 package main
 
 import (
-	"bufio"
-	"crypto/sha1"
-	"encoding/hex"
-	"errors"
 	"flag"
 	"fmt"
-	"io"
 	"os"
-	"strings"
 
-	esum "github.com/emojisum/emojisum/emoji"
+	"github.com/emojisum/emojisum/cmd"
 	"github.com/kyokomi/emoji"
 )
 
@@ -31,58 +25,20 @@ func run() error {
 	flag.Parse()
 
 	if *flParseOpenSSL {
-		buf := bufio.NewReader(os.Stdin)
-		for {
-			line, err := buf.ReadString('\n')
-			if err != nil && err == io.EOF {
-				return nil
-			} else if err != nil {
-				return err
-			}
-			hash, name, sum, err := parseOpenSSL(line)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
-				continue
-			}
-			str := emojiFromBytes(sum)
-			fmt.Printf("%s(%s)= %x\n", hash, name, sum)
-			fmt.Printf("%s(%s)= %s\n", hash, name, str)
-			fmt.Printf("%s(%s)= ", hash, name)
-			emoji.Println(str)
-		}
-		// never gets here because of the return on EOF or err
+		return cmd.PrintOpenSSL(os.Stdin)
 	}
 	if *flParseCoreUtils {
-		buf := bufio.NewReader(os.Stdin)
-		for {
-			line, err := buf.ReadString('\n')
-			if err != nil && err == io.EOF {
-				return nil
-			} else if err != nil {
-				return err
-			}
-			name, sum, err := parseCoreUtils(line)
-			if err != nil {
-				fmt.Fprintf(os.Stderr, "%s: %q\n", err, line)
-				continue
-			}
-			str := emojiFromBytes(sum)
-			fmt.Printf("%x  %s\n", sum, name)
-			fmt.Printf("%s  %s\n", str, name)
-			emoji.Print(str)
-			fmt.Printf("  %s\n", name)
-		}
-		// never gets here because of the return on EOF or err
+		return cmd.PrintCoreUtils(os.Stdin)
 	}
 
 	// Otherwise do the checksum ourselves
 
 	if flag.NArg() == 0 {
-		sum, err := Sum(os.Stdin)
+		sum, err := cmd.Sum(os.Stdin)
 		if err != nil {
 			return err
 		}
-		str := emojiFromBytes(sum)
+		str := cmd.EmojiFromBytes(sum)
 		fmt.Printf("SHA1(-)= %x\n", sum)
 		fmt.Printf("SHA1(-)= %s\n", str)
 		fmt.Printf("SHA1(-)= ")
@@ -97,11 +53,11 @@ func run() error {
 		}
 		defer fh.Close()
 
-		sum, err := Sum(fh)
+		sum, err := cmd.Sum(fh)
 		if err != nil {
 			return err
 		}
-		str := emojiFromBytes(sum)
+		str := cmd.EmojiFromBytes(sum)
 		fmt.Printf("SHA1(%s)= %x\n", arg, sum)
 		fmt.Printf("SHA1(%s)= %s\n", arg, str)
 		fmt.Printf("SHA1(%s)= ", arg)
@@ -109,78 +65,3 @@ func run() error {
 	}
 	return nil
 }
-
-/*
-openssl sum:
-```
-$> openssl sha256 tmp.efLuko
-SHA256(tmp.efLuko)= f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb
-```
-*/
-func parseOpenSSL(line string) (hash, filename string, sum []byte, err error) {
-	if !strings.Contains(line, "(") {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	chunks := strings.SplitN(strings.TrimRight(line, "\n"), ")= ", 2)
-	if len(chunks) != 2 {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	chunksprime := strings.SplitN(chunks[0], "(", 2)
-	if len(chunks) != 2 {
-		return "", "", nil, ErrNotOpenSSLLine
-	}
-	sum, err = hex.DecodeString(chunks[1])
-	if err != nil {
-		return "", "", nil, err
-	}
-	return chunksprime[0], chunksprime[1], sum, nil
-}
-
-// ErrNotOpenSSLLine when the line to parse is not formated like an OpenSSL checksum line
-var ErrNotOpenSSLLine = errors.New("not an openssl checksum line")
-
-/*
-coreutils output:
-```
-$ sha256sum ./tmp.efLuko
-f18bd8b680e834ab8097a66deb0255821195d9624e39da6b65903ff6a09a01bb  ./tmp.efLuko
-```
-*/
-func parseCoreUtils(line string) (filename string, sum []byte, err error) {
-	chunks := strings.SplitN(strings.TrimRight(line, "\n"), "  ", 2)
-	if len(chunks) != 2 {
-		return "", nil, ErrNotCoreUtilsLine
-	}
-	sum, err = hex.DecodeString(chunks[0])
-	if err != nil {
-		return "", nil, err
-	}
-	return chunks[1], sum, nil
-}
-
-// ErrNotCoreUtilsLine when the line to parse is not formated like a coreutils checksum line
-var ErrNotCoreUtilsLine = errors.New("not a coreutils checksum line")
-
-// Sum is a basic wrapper around crypto/sha1
-func Sum(r io.Reader) ([]byte, error) {
-	h := sha1.New()
-	if _, err := io.Copy(h, r); err != nil {
-		return nil, err
-	}
-	sum := h.Sum(nil)
-	return sum[:], nil
-}
-
-func emojiFromBytes(buf []byte) string {
-	var ret string
-	for _, b := range buf {
-		for _, e := range esum.Map(b) {
-			// use the first colon notation word and continue
-			if esum.IsColonNotation(e) {
-				ret = ret + e
-				break
-			}
-		}
-	}
-	return ret
-}