/
flag_print.go
135 lines (114 loc) · 3.06 KB
/
flag_print.go
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package confinator
import (
"flag"
"fmt"
"strings"
)
type HelpTextState struct {
FlagSet *flag.FlagSet
LongestName int
LongestDefault int
Current string
}
type FlagHelpHeaderFunc func(state HelpTextState) string
var DefaultFlagHelpHeaderFunc FlagHelpHeaderFunc = func(state HelpTextState) string {
return fmt.Sprintf("%s\n", state.FlagSet.Name())
}
type FlagHelpTableHeaderFunc func(state HelpTextState) string
var DefaultFlagHelpTableHeaderFunc FlagHelpTableHeaderFunc = func(state HelpTextState) string {
return fmt.Sprintf(
"\t[Flag]%s[Default]%s[Usage]",
strings.Repeat(" ", state.LongestName-1),
strings.Repeat(" ", state.LongestDefault-5),
)
}
type FlagHelpTableRowFunc func(flagNum int, f *flag.Flag, state HelpTextState) string
var DefaultFlagHelpTableRowFunc FlagHelpTableRowFunc = func(flagNum int, f *flag.Flag, state HelpTextState) string {
return fmt.Sprintf(
"\n\t-%s%s%s%s%s",
f.Name,
strings.Repeat(" ", state.LongestName-len(f.Name)+4),
f.DefValue,
strings.Repeat(" ", state.LongestDefault-len(f.DefValue)+4),
f.Usage,
)
}
type FlagHelpTableFooterFunc func(state HelpTextState) string
var DefaultFlagHelpTableFooterFunc FlagHelpTableFooterFunc = func(state HelpTextState) string {
return ""
}
type FlagHelpFooterFunc func(state HelpTextState) string
var DefaultFlagHelpFooterFunc FlagHelpFooterFunc = func(state HelpTextState) string {
return ""
}
type FlagHelpTextConf struct {
FlagSet *flag.FlagSet
HeaderFunc FlagHelpHeaderFunc
TableHeaderFunc FlagHelpTableHeaderFunc
TableRowFunc FlagHelpTableRowFunc
TableFooterFunc FlagHelpTableFooterFunc
FooterFunc FlagHelpFooterFunc
}
func FlagHelpText(conf FlagHelpTextConf) string {
var (
longestName int
longestDefault int
out string
hf FlagHelpHeaderFunc
thf FlagHelpTableHeaderFunc
trf FlagHelpTableRowFunc
tff FlagHelpTableFooterFunc
ff FlagHelpFooterFunc
fs = conf.FlagSet
)
if conf.HeaderFunc == nil {
hf = DefaultFlagHelpHeaderFunc
} else {
hf = conf.HeaderFunc
}
if conf.TableHeaderFunc == nil {
thf = DefaultFlagHelpTableHeaderFunc
} else {
thf = conf.TableHeaderFunc
}
if conf.TableRowFunc == nil {
trf = DefaultFlagHelpTableRowFunc
} else {
trf = conf.TableRowFunc
}
if conf.TableFooterFunc == nil {
tff = DefaultFlagHelpTableFooterFunc
} else {
tff = conf.TableFooterFunc
}
if conf.FooterFunc == nil {
ff = DefaultFlagHelpFooterFunc
} else {
ff = conf.FooterFunc
}
fs.VisitAll(func(f *flag.Flag) {
if l := len(f.Name); l > longestName {
longestName = l
}
if l := len(f.DefValue); l > longestDefault {
longestDefault = l
}
})
makeState := func() HelpTextState {
return HelpTextState{
FlagSet: fs,
LongestName: longestName,
LongestDefault: longestDefault,
Current: out,
}
}
out = hf(makeState())
out = fmt.Sprintf("%s%s", out, thf(makeState()))
i := 0
fs.VisitAll(func(f *flag.Flag) {
out = fmt.Sprintf("%s%s", out, trf(i, f, makeState()))
i++
})
out = fmt.Sprintf("%s%s%s", out, tff(makeState()), ff(makeState()))
return out
}