1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
// A demo for difflib. This program accepts the paths to two files and
// launches a web server at port 8080 that serves the diff results.
package main
import (
"fmt"
"github.com/aryann/difflib"
"html"
"html/template"
"io/ioutil"
"net/http"
"os"
"strings"
)
var hostPort = "localhost:8080"
var templateString = `
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>difflib results</title>
<style type="text/css">
table {
background-color: lightgrey;
border-spacing: 1px;
}
tr {
background-color: white;
border-bottom: 1px solid black;
}
.line-num {
width: 50px;
}
.added {
background-color: green;
}
.deleted {
background-color: red;
}
</style>
</head>
<body>
<table>
<tr>
<th></th>
<th><em>{{.Filename1}}</em></th>
<th><em>{{.Filename2}}</em></th>
<th></th>
</tr>
{{.Diff}}
</table>
</body>
</html>
`
func main() {
if len(os.Args) != 3 {
fmt.Fprintf(os.Stderr, "USAGE: %s <file-1> <file-2>\n", os.Args[0])
os.Exit(1)
}
http.HandleFunc("/", diffHandler(os.Args[1], os.Args[2]))
fmt.Printf("Starting server at %s.\n", hostPort)
err := http.ListenAndServe(hostPort, nil)
if err != nil {
panic(err)
}
}
// diffHandler returns an http.HandlerFunc that serves the diff of the
// two given files.
func diffHandler(filename1, filename2 string) http.HandlerFunc {
diff := difflib.HTMLDiff(fileToLines(filename1), fileToLines(filename2))
tmpl, _ := template.New("diffTemplate").Parse(templateString)
return func(w http.ResponseWriter, r *http.Request) {
err := tmpl.Execute(w, map[string]interface{}{
"Diff": template.HTML(diff),
"Filename1": filename1,
"Filename2": filename2,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
}
// filesToLines takes a path to a file and returns a string array of
// the lines in the file. Any HTML in the file is escaped.
func fileToLines(filename string) []string {
contents, _ := ioutil.ReadFile(filename)
return strings.Split(html.EscapeString(string(contents)), "\n")
}
|
