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add usage message

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R=gri
OCL=13423
CL=13423
This commit is contained in:
Rob Pike 2008-07-24 10:38:22 -07:00
parent ac0dd5ae52
commit 7693409677
1 changed files with 47 additions and 14 deletions
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61
src/lib/flag.go
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@ -37,6 +37,8 @@ package flag
* Boolean flags may be 1, 0, t, f, true, false, TRUE, FALSE, True, False.
*/
import fmt "fmt"
export Bool, Int, String
export Arg, NArg
export Parse
@ -138,6 +140,15 @@ func (b *BoolValue) Set(val bool) {
b.val = val
}
func (b *BoolValue) Str() string {
if b.val {
return "true"
}
else {
return "false"
}
}
func NewBoolValue(b bool, p *bool) *BoolValue {
v := new(BoolValue);
v.val = b;
@ -187,6 +198,10 @@ func (i *IntValue) Set(val int64) {
i.val = val
}
func (i *IntValue) Str() string {
return fmt.New().D(i.val).str()
}
func
NewIntValue(i int64, p *int64) *IntValue {
v := new(IntValue);
@ -236,6 +251,10 @@ func (s *StringValue) Set(val string) {
s.val = val
}
func (s *StringValue) Str() string {
return `"` + s.val + `"`
}
func NewStringValue(s string, p *string) *StringValue {
v := new(StringValue);
v.val = s;
@ -251,6 +270,7 @@ type Value interface {
IsBool() bool;
IsInt() bool;
IsString() bool;
Str() string;
ValidValue(str string) bool;
}
@ -259,12 +279,23 @@ type Flag struct {
name string;
usage string;
value Value;
next *Flag; // BUG: remove when we can iterate over maps
}
type Flags struct {
actual *map[string] *Flag;
formal *map[string] *Flag;
first_arg int;
flag_list *Flag; // BUG: remove when we can iterate over maps
}
func (flags *Flags) Usage() {
// BUG: use map iteration when available
print "Usage: \n";
for f := flags.flag_list; f != nil; f = f.next {
print " -", f.name, "=", f.value.Str(), ": ", f.usage, "\n";
}
sys.exit(1);
}
// --Customer's value getters
@ -322,6 +353,8 @@ func Add(name string, value Value, usage string) *Flag {
panic "flag redefinition"
}
flags.formal[name] = f;
f.next = flags.flag_list; // BUG: remove when we can iterate over maps
flags.flag_list = f; // BUG: remove when we can iterate over maps
return f;
}
@ -359,8 +392,8 @@ func (f *Flags) ParseOne(index int) (ok bool, next int)
}
name := s[num_minuses : len(s)];
if len(name) == 0 || name[0] == '-' || name[0]=='=' {
print "bad flag syntax: ", s, "\n"
return false, -1
print "bad flag syntax: ", s, "\n";
f.Usage();
}
// it's a flag. does it have an argument?
@ -376,14 +409,14 @@ func (f *Flags) ParseOne(index int) (ok bool, next int)
}
flag, alreadythere := flags.actual[name];
if alreadythere {
print "flag specified twice: -", name, "\n"
return false, -1
print "flag specified twice: -", name, "\n";
f.Usage();
}
m := flags.formal;
flag, alreadythere = m[name]; // BUG
if !alreadythere {
print "flag provided but not defined: -", name, "\n"
return false, -1
print "flag provided but not defined: -", name, "\n";
f.Usage();
}
if !has_value && index < sys.argc()-1 && flag.value.ValidValue(sys.argv(index+1)) {
// value is the next arg
@ -396,8 +429,8 @@ func (f *Flags) ParseOne(index int) (ok bool, next int)
if has_value {
k, ok := atob(value);
if !ok {
print "invalid boolean value ", value, " for flag: -", name, "\n"
return false, -1
print "invalid boolean value ", value, " for flag: -", name, "\n";
f.Usage();
}
flag.value.AsBool().Set(k)
} else {
@ -405,19 +438,19 @@ func (f *Flags) ParseOne(index int) (ok bool, next int)
}
case flag.value.IsInt():
if !has_value {
print "flag needs an argument: -", name, "\n"
return false, -1
print "flag needs an argument: -", name, "\n";
f.Usage();
}
k, ok := atoi(value);
if !ok {
print "invalid integer value ", value, " for flag: -", name, "\n"
return false, -1
print "invalid integer value ", value, " for flag: -", name, "\n";
f.Usage();
}
flag.value.AsInt().Set(k)
case flag.value.IsString():
if !has_value {
print "flag needs an argument: -", name, "\n"
return false, -1
print "flag needs an argument: -", name, "\n";
f.Usage();
}
flag.value.AsString().Set(value)
}