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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#! /usr/bin/env sh
# Taken in verbatim from: https://unix.stackexchange.com/a/113450, and somewhat changed
LE_print_debug() {
LE_debug="$1"
LE_debug_msg="$2"
[ -n "$LE_debug" ] && printf "\nDBG: (%s)\n" "$LE_debug_msg" >outfile.debug
}
LE() {
# Shell Line Editor. Extremely slow and stupid code. However it
# should work on ansi/vt100/linux derived terminals on POSIX
# systems.
# Understands some emacs key bindings: CTRL-(A,B,D,E,F,H,K,L)
# plus the CTRL-W and CTRL-U normal killword and kill.
# no Meta-X key, but handling of <Left>, <Right>, <Home>, <End>
# <Suppr>.
#
# Args:
# [1]: prompt (\x sequences recognized, defaults to "")
# [2]: max input length (unlimited if < 0, (default))
# [3]: fill character when erasing (defaults to space)
# [4]: initial value.
# [5]: whether to output debugfiles (outfile.debug and outfile.raw.debug)
# Returns:
# 0: OK
# 1: od(d) error or CTRL-C hit
LE_prompt="$1"
LE_max=${2--1}
LE_fill=${3-" "}
LE_debug="$5"
LE_backward() {
LE_substract="$1"
while [ -n "$LE_substract" ]; do
printf '\b%s' "$2"
LE_substract=${LE_substract%?}
done
}
LE_fill() {
LE_substract="$1"
while [ -n "$LE_substract" ]; do
printf '%s' "$LE_fill"
LE_substract=${LE_substract%?}
done
}
# Used but not right now
# shellcheck disable=2016
LE_restore='stty "$LE_tty"
LC_COLLATE='${LC_COLLATE-"; unset LC_COLLATE"}
# LE_tty is used in the restore above
# shellcheck disable=2034
LE_ret=1 LE_tty=$(stty -g) LC_COLLATE=C
# text on the right of the cursor
LE_left=$4
# text on the left of the cursor
LE_right=''
# Tell the terminal to show us every char inputted
stty -icanon -echo -isig min 3 time 1 -istrip
printf '%b%s' "$LE_prompt" "$LE_left"
# clear the output
[ -n "$LE_debug" ] && printf "" >outfile.debug
[ -n "$LE_debug" ] && printf "" >outfile.raw.debug
# The value needs to be split for it to work (and it's either way just numbers)
# shellcheck disable=2046
while set -- $(dd bs=3 count=1 2>/dev/null | od -vAn -to1); do
while [ "$#" -gt 0 ]; do
[ -n "$LE_debug" ] && printf "%b" "\0$1" >>outfile.debug
[ -n "$LE_debug" ] && printf "%s " "$1" >>outfile.raw.debug
LE_current_key=$1
shift
# 033 is ^[ (`printf "\\$1\n" | cat -v`)
if [ "$LE_current_key" = 033 ]; then
case "$1$2$3" in
# [ C | O C -> ^F forward
133103* | 117103*)
shift 2
LE_current_key=006
;;
# [ D | O D -> ^B backward
133104* | 117104*)
shift 2
LE_current_key=002
;;
# [ H | O H -> ^A beginning of line
133110* | 117110*)
shift 2
LE_current_key=001
;;
# [ P | O P -> ^D del char
133120* | 117120*)
shift 2
LE_current_key=004
;;
# [ F | O F -> ^E end of line
133106* | 117106*)
shift 2
LE_current_key=005
;;
# [ 1 ~ -> ^A beginning of line
133061176)
shift 3
LE_current_key=001
;;
# [ 4 ~ -> ^E end of line
133064176)
shift 3
LE_current_key=005
;;
# [ 3 ~ -> ^D del char
133063176)
shift 3
LE_current_key=004
;;
# [ | O
133* | 117*)
shift
# Is $1 in ge 0 AND le 9 OR eq ';'?
# These are control sequences for things like colors; Ignore them
while [ "0$1" -ge 060 ] && [ "0$1" -le 071 ] ||
[ "0$1" -eq 073 ]; do
shift
done
;;
esac
fi
case "$LE_current_key" in
001) # ^A beginning of line
LE_backward "$LE_left"
LE_right="$LE_left$LE_right"
LE_left=
;;
002) # ^B backward
if [ "$LE_left" = "" ]; then
# bell
printf '\a'
LE_print_debug "$LE_debug" "backward with empty left"
else
printf '\b'
LE_tmp="${LE_left%?}"
LE_right="${LE_left#"$LE_tmp"}$LE_right"
LE_left="$LE_tmp"
fi ;;
003) # CTRL-C
break 2 ;;
004) # ^D del char
if [ "$LE_right" = "" ]; then
# bell (tell the user that the line is empty)
printf '\a'
LE_print_debug "$LE_debug" "delete with empty right"
else
LE_right="${LE_right#?}"
printf '%s\b' "$LE_right$LE_fill"
LE_backward "$LE_right"
fi ;;
012 | 015) # NL or CR
LE_ret=0
break 2
;;
005) # ^E end of line
printf '%s' "$LE_right"
LE_left="$LE_left$LE_right"
LE_right=
;;
006) # ^F forward
if [ "$LE_right" = "" ]; then
# bell (tell the user that the line is empty)
printf '\a'
LE_print_debug "$LE_debug" "forward with empty right"
else
LE_tmp="${LE_right#?}"
LE_left="$LE_left${LE_right%"$LE_tmp"}"
printf %s "${LE_right%"$LE_tmp"}"
LE_right="$LE_tmp"
fi ;;
010 | 177) # backspace or del
if [ "$LE_left" = "" ]; then
# bell
printf '\a'
LE_print_debug "$LE_debug" "backspace with empty left"
else
printf '\b%s\b' "$LE_right$LE_fill"
LE_backward "$LE_right"
LE_left="${LE_left%?}"
fi ;;
013) # ^K kill to end of line
LE_fill "$LE_right"
LE_backward "$LE_right"
LE_right=""
;;
014) # ^L redraw
printf '\r%b%s' "$LE_prompt" "$LE_left$LE_right"
LE_backward "$LE_right"
;;
025) # ^U kill line
LE_backward "$LE_left"
LE_fill "$LE_left$LE_right"
LE_backward "$LE_left$LE_right"
LE_left=""
LE_right=""
;;
027) # ^W kill word
if [ "$LE_left" = "" ]; then
# bell
printf '\a'
else
LE_tmp="${LE_left% *}"
LE_backward "${LE_left#"$LE_tmp"}"
LE_fill "${LE_left#"$LE_tmp"}"
LE_backward "${LE_left#"$LE_tmp"}"
LE_left="$LE_tmp"
fi ;;
# Print the received key, as it did not match a special key
[02][4-7]? | [13]??) # 040 -> 177, 240 -> 377
# was assuming iso8859-x at the time
if [ "$LE_max" -gt 0 ] && LE_tmp="$LE_left$LE_right" &&
[ "${#LE_tmp}" -eq "$LE_max" ]; then
# bell, when the user is trying to cross the line limit
printf '\a'
LE_print_debug "$LE_debug" "max output reached"
else
LE_left="$LE_left$(printf '%b' "\0$LE_current_key")"
printf '%b%s' "\0$LE_current_key" "$LE_right"
LE_backward "$LE_right"
fi ;;
*)
LE_print_debug "$LE_debug" "key not recognized: $(printf "%b" "\0$LE_current_key")"
printf '\a'
;;
esac
done
done
eval "$LE_restore"
REPLY=$LE_left$LE_right
echo
return "$LE_ret"
}
|
