/
main.go
81 lines (61 loc) · 1.08 KB
/
main.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
package main
import (
"fmt"
"os"
"strings"
"github.com/alecthomas/kong"
"github.com/chzyer/readline"
"github.com/winebarrel/tm"
)
var (
version string
)
type Options struct {
Expr string `arg:"" optional:"" help:"Expression to evaluate."`
}
func parseArgs() *Options {
var CLI struct {
Options
Version kong.VersionFlag
}
parser := kong.Must(&CLI, kong.Vars{"version": version})
parser.Model.HelpFlag.Help = "Show help."
_, err := parser.Parse(os.Args[1:])
parser.FatalIfErrorf(err)
return &CLI.Options
}
func repl() {
rl, err := readline.NewEx(&readline.Config{Prompt: "tm> "})
if err != nil {
panic(err)
}
defer rl.Close()
for {
line, err := rl.Readline()
if err != nil {
break
}
if strings.TrimSpace(line) == "" {
continue
}
rs, err := tm.Eval(line)
if err != nil {
fmt.Println(err)
continue
}
fmt.Println(rs)
}
}
func main() {
options := parseArgs()
if options.Expr != "" {
rs, err := tm.Eval(options.Expr)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
fmt.Println(rs)
} else {
repl()
}
}