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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// +build !windows
// This file contains a simple and incomplete implementation of the terminfo
// database. Information was taken from the ncurses manpages term(5) and
// terminfo(5). Currently, only the string capabilities for special keys and for
// functions without parameters are actually used. Colors are still done with
// ANSI escape sequences. Other special features that are not (yet?) supported
// are reading from ~/.terminfo, the TERMINFO_DIRS variable, Berkeley database
// format and extended capabilities.
package termbox
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"os"
"strings"
)
const (
ti_magic = 0432
ti_header_length = 12
)
func load_terminfo() ([]byte, error) {
var data []byte
var err error
term := os.Getenv("TERM")
if term == "" {
return nil, fmt.Errorf("termbox: TERM not set")
}
// The following behaviour follows the one described in terminfo(5) as
// distributed by ncurses.
terminfo := os.Getenv("TERMINFO")
if terminfo != "" {
// if TERMINFO is set, no other directory should be searched
return ti_try_path(terminfo)
}
// next, consider ~/.terminfo
home := os.Getenv("HOME")
if home != "" {
data, err = ti_try_path(home + "/.terminfo")
if err == nil {
return data, nil
}
}
// next, TERMINFO_DIRS
dirs := os.Getenv("TERMINFO_DIRS")
if dirs != "" {
for _, dir := range strings.Split(dirs, ":") {
if dir == "" {
// "" -> "/usr/share/terminfo"
dir = "/usr/share/terminfo"
}
data, err = ti_try_path(dir)
if err == nil {
return data, nil
}
}
}
// fall back to /usr/share/terminfo
return ti_try_path("/usr/share/terminfo")
}
func ti_try_path(path string) (data []byte, err error) {
// load_terminfo already made sure it is set
term := os.Getenv("TERM")
// first try, the typical *nix path
terminfo := path + "/" + term[0:1] + "/" + term
data, err = ioutil.ReadFile(terminfo)
if err == nil {
return
}
// fallback to darwin specific dirs structure
terminfo = path + "/" + hex.EncodeToString([]byte(term[:1])) + "/" + term
data, err = ioutil.ReadFile(terminfo)
return
}
func setup_term_builtin() error {
name := os.Getenv("TERM")
if name == "" {
return errors.New("termbox: TERM environment variable not set")
}
for _, t := range terms {
if t.name == name {
keys = t.keys
funcs = t.funcs
return nil
}
}
compat_table := []struct {
partial string
keys []string
funcs []string
}{
{"xterm", xterm_keys, xterm_funcs},
{"rxvt", rxvt_unicode_keys, rxvt_unicode_funcs},
{"linux", linux_keys, linux_funcs},
{"Eterm", eterm_keys, eterm_funcs},
{"screen", screen_keys, screen_funcs},
// let's assume that 'cygwin' is xterm compatible
{"cygwin", xterm_keys, xterm_funcs},
{"st", xterm_keys, xterm_funcs},
}
// try compatibility variants
for _, it := range compat_table {
if strings.Contains(name, it.partial) {
keys = it.keys
funcs = it.funcs
return nil
}
}
return errors.New("termbox: unsupported terminal")
}
func setup_term() (err error) {
var data []byte
var header [6]int16
var str_offset, table_offset int16
data, err = load_terminfo()
if err != nil {
return setup_term_builtin()
}
rd := bytes.NewReader(data)
// 0: magic number, 1: size of names section, 2: size of boolean section, 3:
// size of numbers section (in integers), 4: size of the strings section (in
// integers), 5: size of the string table
err = binary.Read(rd, binary.LittleEndian, header[:])
if err != nil {
return
}
if (header[1]+header[2])%2 != 0 {
// old quirk to align everything on word boundaries
header[2] += 1
}
str_offset = ti_header_length + header[1] + header[2] + 2*header[3]
table_offset = str_offset + 2*header[4]
keys = make([]string, 0xFFFF-key_min)
for i, _ := range keys {
keys[i], err = ti_read_string(rd, str_offset+2*ti_keys[i], table_offset)
if err != nil {
return
}
}
funcs = make([]string, t_max_funcs)
// the last two entries are reserved for mouse. because the table offset is
// not there, the two entries have to fill in manually
for i, _ := range funcs[:len(funcs)-2] {
funcs[i], err = ti_read_string(rd, str_offset+2*ti_funcs[i], table_offset)
if err != nil {
return
}
}
funcs[t_max_funcs-2] = "\x1b[?1000h"
funcs[t_max_funcs-1] = "\x1b[?1000l"
return nil
}
func ti_read_string(rd *bytes.Reader, str_off, table int16) (string, error) {
var off int16
_, err := rd.Seek(int64(str_off), 0)
if err != nil {
return "", err
}
err = binary.Read(rd, binary.LittleEndian, &off)
if err != nil {
return "", err
}
_, err = rd.Seek(int64(table+off), 0)
if err != nil {
return "", err
}
var bs []byte
for {
b, err := rd.ReadByte()
if err != nil {
return "", err
}
if b == byte(0x00) {
break
}
bs = append(bs, b)
}
return string(bs), nil
}
// "Maps" the function constants from termbox.go to the number of the respective
// string capability in the terminfo file. Taken from (ncurses) term.h.
var ti_funcs = []int16{
28, 40, 16, 13, 5, 39, 36, 27, 26, 34, 89, 88,
}
// Same as above for the special keys.
var ti_keys = []int16{
66, 68 /* apparently not a typo; 67 is F10 for whatever reason */, 69, 70,
71, 72, 73, 74, 75, 67, 216, 217, 77, 59, 76, 164, 82, 81, 87, 61, 79, 83,
}
|
