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getopts.odin
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getopts.odin
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package getopts
import "core:fmt"
import "core:mem"
import "core:os"
import str "core:strings"
optarg_opt :: enum {
NO_ARGUMENT = 0,
REQUIRED_ARGUMENT = 1,
OPTIONAL_ARGUMENT = 2,
}
optarg_val :: union {
string,
bool,
}
Option :: struct {
name: string,
alt_name: string,
has_arg: optarg_opt,
val: optarg_val,
set: bool,
}
Options :: struct {
opts: [dynamic]Option,
}
strchr :: proc(s, sub: string) -> string {
offset := str.index(s, sub)
if offset < 0 do return ""
return str.clone(s[offset:])
}
@(private = "file")
_progname :: proc(arg: string) -> string {
temp := strchr(arg, "/")
if temp != "" do return temp[1:]
else do return arg
}
init_opts :: proc() -> Options {
return Options{opts = make([dynamic]Option)}
}
deinit_opts :: proc(o: ^Options) {
for opt in o.opts {
if str, ok := opt.val.(string); ok {delete(str)}
}
delete(o.opts)
}
add_arg :: proc(o: ^Options, name: string, req: optarg_opt, alt_name: string = "") {
if o == nil || len(name) == 0 do os.exit(1)
for opt in o.opts {
if str.compare(name, opt.name) == 0 || str.compare(name, opt.alt_name) == 0 {
fmt.fprintf(
os.stderr,
"%s: Option %v has already been added",
_progname(os.args[0]),
name,
)
os.exit(1)
}
}
append(&o.opts, Option{name, alt_name, req, false, false})
}
getopt_long :: proc(args: []string, opts: ^Options) {
assert(len(opts.opts) != 0, "No options present\n")
assert(len(args) > 1, "No arguments present\n")
found: bool
arg: string
i: int = 1 // Skip the program name.
for i < len(args) {
if str.has_prefix(args[i], "--") {
arg = args[i][2:]
} else if str.has_prefix(args[i], "-") {
arg = args[i][1:]
} else {
fmt.fprintf(os.stderr, "%s: Invalid argument -- '%v'\n", _progname(args[0]), args[i])
os.exit(1) // Don't accept args without '-'
}
has_equals: string = strchr(arg, "=")
equals_val: string
if len(has_equals) != 0 {
equals_val = has_equals[1:] // Truncate the =
arg = arg[:len(equals_val) - 1]
}
for &opt in opts.opts {
if str.compare(opt.name, arg) == 0 || str.compare(opt.alt_name, arg) == 0 { // Found an argument!
using optarg_opt
// Do we need a value?
if opt.has_arg == .REQUIRED_ARGUMENT || opt.has_arg == .OPTIONAL_ARGUMENT {
if len(equals_val) == 0 {
if opt.has_arg == .REQUIRED_ARGUMENT && len(args) < i + 1 {
// Needs arg ++ no args left.
fmt.fprintf(
os.stderr,
"%s: %v requires an argument",
_progname(args[0]),
arg,
)
os.exit(1)
}
// Handle optional:
if len(args) < i + 1 {
opt.val = true
} else if str.has_prefix(args[i + 1], "-") {
// Handle the case of --flag --new_flag=10
opt.val = true
} else {
opt.val = str.clone(args[i + 1])
i += 1
}
opt.set = true
found = true
break
} else {
opt.val = str.clone(equals_val)
opt.set = true
found = true
break
}
} else { // Its just a FLAG to set
opt.val = true
opt.set = true
found = true
break
}
}
}
if found != true {
fmt.println("%s: no argument -- %v", _progname(args[0]), arg)
os.exit(1)
}
if len(has_equals) > 0 do delete(has_equals)
arg = ""
i += 1
found = false
}
}