-
Notifications
You must be signed in to change notification settings - Fork 2
/
cli.go
104 lines (94 loc) · 2.04 KB
/
cli.go
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
98
99
100
101
102
103
104
package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os/exec"
"strings"
"cloud.google.com/go/spanner/spansql"
)
const (
defaultFileBasename = "spanner_er"
exitCodeOK int = 0
exitCodeError = 10 + iota
exitCodeArgsError
)
type cli struct{}
func (cli *cli) run(args []string) int {
var (
help bool
file string
output string
t string
)
flags := flag.NewFlagSet("", flag.ContinueOnError)
flags.BoolVar(&help, "h", false, "print help")
flags.StringVar(&file, "s", "", "spanner schema file")
flags.StringVar(&output, "o", "", "output file name.default is spanner_er.<type>(pass to dot option -o)")
flags.StringVar(&t, "T", "png", "output file type. default is png(pass to dot option -T)")
if err := flags.Parse(args); err != nil {
return exitCodeArgsError
}
if help {
flags.Usage()
return exitCodeOK
}
if file == "" {
flags.Usage()
return exitCodeArgsError
}
if output == "" {
output = fmt.Sprintf("%s.%s", defaultFileBasename, t)
}
body, err := cli.read(file)
if err != nil {
log.Print(err)
return exitCodeError
}
tables, err := parse(body)
if err != nil {
log.Print(err)
return exitCodeError
}
graph, err := NewGraph()
if err != nil {
log.Print(err)
return exitCodeError
}
if err := graph.ApplyTables(tables); err != nil {
log.Print(err)
return exitCodeError
}
s := graph.String()
r := strings.NewReader(s)
c := exec.Command("dot", fmt.Sprintf("-T%s", t), "-o", output)
c.Stdin = r
c.Start()
c.Wait()
return exitCodeOK
}
func (cli *cli) read(file string) (string, error) {
data, err := ioutil.ReadFile(file)
if err != nil {
return "", err
}
body := string(data)
return body, nil
}
func parse(sqls string) ([]*spansql.CreateTable, error) {
// spansql not allow backquote
sqls = strings.Replace(sqls, "`", "", -1)
d, err := spansql.ParseDDL("", sqls)
if err != nil {
return nil, err
}
tables := []*spansql.CreateTable{}
for _, e := range d.List {
switch v := e.(type) {
case *spansql.CreateTable:
tables = append(tables, v)
}
}
return tables, nil
}