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
|
use "alloc"
use "die"
use "extremum"
use "fmt"
use "strbuf"
use "option"
use "sleq"
use "slpush"
use "syswrap-ss"
use "syswrap"
use "types"
use "utf"
pkg std =
type optdef = struct
argdesc : byte[:] /* the description for the usage */
minargs : std.size /* the minimum number of positional args */
maxargs : std.size /* the maximum number of positional args (0 = unlimited) */
noargs : std.bool /* whether we accept args at all */
opts : optdesc[:] /* the description of the options */
;;
type optdesc = struct
opt : char
arg : byte[:]
desc : byte[:]
dest : std.option(byte[:]#)
optional : bool
;;
type optparsed = struct
opts : (char, byte[:])[:]
args : byte[:][:]
prog : byte[:]
;;
const optparse : (optargs : byte[:][:], def : optdef# -> optparsed)
const optusage : (prog : byte[:], def : optdef# -> void)
;;
type optctx = struct
/* public variables */
args : byte[:][:]
/* data passed in */
optdef : optdef#
optargs : byte[:][:]
/* state */
argidx : size
curarg : byte[:]
optdone : bool /* if we've seen '--', everything's an arg */
finished : bool /* if we've processed all the optargs */
;;
const optparse = {args, def
var ctx : optctx
var parsed
parsed = [
.opts=[][:],
.args=[][:],
.prog=args[0]
]
optinit(&ctx, args, def)
while !optdone(&ctx)
slpush(&parsed.opts, optnext(&ctx))
;;
if ctx.args.len < def.minargs
put("error: expected at least {} args, got {}\n", def.minargs, ctx.args.len)
optusage(ctx.optargs[0], ctx.optdef)
exit(1)
;;
if def.maxargs > 0 && ctx.args.len > def.maxargs
put("error: expected at most {} args, got {}\n", def.maxargs, ctx.args.len)
optusage(ctx.optargs[0], ctx.optdef)
exit(1)
;;
if def.noargs && ctx.args.len != 0
put("error: expected no args, got {}\n", ctx.args.len)
optusage(ctx.optargs[0], ctx.optdef)
exit(1)
;;
parsed.args = ctx.args
-> parsed
}
const optinit = {ctx, args, def
ctx# = [
.optargs = args,
.optdef = def,
.optdone = false,
.finished = false,
.argidx = 0,
.curarg = [][:],
.args = [][:],
]
next(ctx)
-> ctx
}
const optnext = {ctx
var c
var arg
(c, ctx.curarg) = strstep(ctx.curarg)
match optinfo(ctx, c)
| `None:
if c == 'h' || c == '?'
optusage(ctx.optargs[0], ctx.optdef)
exit(0)
else
put("Unexpected argument '{}'\n", c)
optusage(ctx.optargs[0], ctx.optdef)
exit(1)
;;
| `Some (true, needed, dest):
/* -arg => '-a' 'rg' */
if ctx.curarg.len > 0
arg = ctx.curarg
ctx.curarg = ctx.curarg[ctx.curarg.len:]
next(ctx)
/* '-a rg' => '-a' 'rg' */
elif ctx.argidx < (ctx.optargs.len - 1)
arg = ctx.optargs[ctx.argidx + 1]
ctx.argidx++
next(ctx)
elif needed
put("Expected argument for '{}'\n", c)
optusage(ctx.optargs[0], ctx.optdef)
exit(1)
;;
match dest
| `std.Some d: d# = arg
| `std.None: /* nothing */
;;
| `Some (false, _, _):
arg = ""
if ctx.curarg.len == 0
next(ctx)
;;
;;
-> (c, arg)
}
const optdone = {ctx
-> ctx.curarg.len == 0 && ctx.finished
}
const optinfo = {ctx, opt
for o : ctx.optdef.opts
if o.opt == opt
-> `Some (o.arg.len != 0, !o.optional, o.dest)
;;
;;
-> `None
}
const next = {ctx
var i
for i = ctx.argidx + 1; i < ctx.optargs.len; i++
if !ctx.optdone && decode(ctx.optargs[i]) == '-'
if sleq(ctx.optargs[i], "--")
ctx.optdone = true
else
goto foundopt
;;
else
slpush(&ctx.args, ctx.optargs[i])
;;
;;
:finishedopt
ctx.finished = true
-> false
:foundopt
ctx.argidx = i
ctx.curarg = ctx.optargs[i][1:]
-> true
}
const optusage = {prog, def
var sb, s
sb = mksb()
std.sbfmt(sb, "usage: {} [-h?", prog)
for o : def.opts
if o.arg.len == 0
std.sbfmt(sb, "{}", o.opt)
;;
;;
std.sbfmt(sb, "] ")
for o : def.opts
if o.arg.len != 0
std.sbfmt(sb, "[-{} {}] ", o.opt, o.arg)
;;
;;
std.sbfmt(sb, "{}\n", def.argdesc)
std.sbfmt(sb, "\t-h\tprint this help message\n")
std.sbfmt(sb, "\t-?\tprint this help message\n")
for o : def.opts
std.sbfmt(sb, "\t-{}{}{}\t{}\n", o.opt, sep(o.arg), o.arg, o.desc)
;;
s = sbfin(sb)
write(1, s)
slfree(s)
}
const sep = {s
if s.len > 0
-> " "
else
-> ""
;;
}
|
