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go-arg
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feat(usage): Include env variable in usage

This commit is contained in:
Denys Vitali 2020-06-03 10:05:20 +02:00
parent 912ef0c3e4
commit d4bb56e096
2 changed files with 26 additions and 9 deletions
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25
usage.go
View File

@ -101,7 +101,7 @@ func (p *Parser) writeUsageForCommand(w io.Writer, cmd *command) {
fmt.Fprint(w, "\n")
}
func printTwoCols(w io.Writer, left, help string, defaultVal string) {
func printTwoCols(w io.Writer, left, help string, defaultVal string, envVal string) {
lhs := " " + left
fmt.Fprint(w, lhs)
if help != "" {
@ -112,8 +112,23 @@ func printTwoCols(w io.Writer, left, help string, defaultVal string) {
}
fmt.Fprint(w, help)
}
bracketsContent := []string{}
if defaultVal != "" {
fmt.Fprintf(w, " [default: %s]", defaultVal)
bracketsContent = append(bracketsContent,
fmt.Sprintf("default: %s", defaultVal),
)
}
if envVal != "" {
bracketsContent = append(bracketsContent,
fmt.Sprintf("env: %s", envVal),
)
}
if len(bracketsContent) > 0 {
fmt.Fprintf(w, " [%s]", strings.Join(bracketsContent, ", "))
}
fmt.Fprint(w, "\n")
}
@ -147,7 +162,7 @@ func (p *Parser) writeHelpForCommand(w io.Writer, cmd *command) {
if len(positionals) > 0 {
fmt.Fprint(w, "\nPositional arguments:\n")
for _, spec := range positionals {
printTwoCols(w, spec.placeholder, spec.help, "")
printTwoCols(w, spec.placeholder, spec.help, "", "")
}
}
@ -194,7 +209,7 @@ func (p *Parser) writeHelpForCommand(w io.Writer, cmd *command) {
if len(cmd.subcommands) > 0 {
fmt.Fprint(w, "\nCommands:\n")
for _, subcmd := range cmd.subcommands {
printTwoCols(w, subcmd.name, subcmd.help, "")
printTwoCols(w, subcmd.name, subcmd.help, "", "")
}
}
}
@ -204,7 +219,7 @@ func (p *Parser) printOption(w io.Writer, spec *spec) {
if spec.short != "" {
left += ", " + synopsis(spec, "-"+spec.short)
}
printTwoCols(w, left, spec.help, spec.defaultVal)
printTwoCols(w, left, spec.help, spec.defaultVal, spec.env)
}
func synopsis(spec *spec, form string) string {

10
usage_test.go
View File

@ -33,9 +33,9 @@ func (n *NameDotName) MarshalText() (text []byte, err error) {
}
func TestWriteUsage(t *testing.T) {
expectedUsage := "Usage: example [--name NAME] [--value VALUE] [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] [--ids IDS] [--values VALUES] [--workers WORKERS] [--file FILE] INPUT [OUTPUT [OUTPUT ...]]\n"
expectedUsage := "Usage: example [--name NAME] [--value VALUE] [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] [--ids IDS] [--values VALUES] [--workers WORKERS] [--testenv TESTENV] [--file FILE] INPUT [OUTPUT [OUTPUT ...]]\n"
expectedHelp := `Usage: example [--name NAME] [--value VALUE] [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] [--ids IDS] [--values VALUES] [--workers WORKERS] [--file FILE] INPUT [OUTPUT [OUTPUT ...]]
expectedHelp := `Usage: example [--name NAME] [--value VALUE] [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] [--ids IDS] [--values VALUES] [--workers WORKERS] [--testenv TESTENV] [--file FILE] INPUT [OUTPUT [OUTPUT ...]]
Positional arguments:
INPUT
@ -51,7 +51,8 @@ Options:
--ids IDS Ids
--values VALUES Values [default: [3.14 42 256]]
--workers WORKERS, -w WORKERS
number of workers to start
number of workers to start [default: 10, env: WORKERS]
--testenv TESTENV, -a TESTENV [env: TEST_ENV]
--file FILE, -f FILE File with mandatory extension [default: scratch.txt]
--help, -h display this help and exit
`
@ -65,7 +66,8 @@ Options:
Optimize int `arg:"-O" help:"optimization level"`
Ids []int64 `help:"Ids"`
Values []float64 `help:"Values"`
Workers int `arg:"-w,env:WORKERS" help:"number of workers to start"`
Workers int `arg:"-w,env:WORKERS" help:"number of workers to start" default:"10"`
TestEnv string `arg:"-a,env:TEST_ENV"`
File *NameDotName `arg:"-f" help:"File with mandatory extension"`
}
args.Name = "Foo Bar"