Unstable v2: Working in progress, the main API might be stable till v2.1.0
cmdr is a POSIX-compliant, command-line argument parser library with Golang.
Since v2, our license moved to Apache 2.0.
See the image frames at #1.
There are many dirty codes in the cmdr.v1 which cannot be refactored as well. It prompted we reimplment a new one as v2.
The passing winter, we did rewrite the cmdr.v2 to keep it clean and absorbed in parsing and dispatching.
Some abilities were removed and relayouted to new modules.
That's why the Option Store has been split as a standalone module hedzr/store1.
A faster and colorful slog-like logger has been implemented freshly as hedzr/logg2.
hedzr/evendeep3 provides a deep fully-functional object copy tool. It helps to deep copy some internal objects easily. It is also ready for you.
hedzr/is4 is an environment detecting framework with many out-of-the-box detectors, such as is.InTesting and is.InDebugging.
Anyway, the whole supply chain painted:
graph BT
hzis(hedzr/is)-->hzlogg(hedzr/logg/slog)
hzis-->hzdiff(hedzr/evendeep)
hzlogg-->hzdiff
hzerrors(gopkg.in/hedzr/errors.v3)-->hzdiff
hzerrors-->hzstore(hedzr/store)
hzis-->hzstore(hedzr/store)
hzlogg-->hzstore(hedzr/store)
hzdiff-->hzstore(hedzr/store)
hzlogg-->cmdr(hedzr/cmdr/v2)
hzis-->cmdr
hzlogg-->cmdr
hzdiff-->cmdr
hzstore-->cmdr
v2 is in earlier state but the baseline is stable:
-
Basic command-line arguments parser like POSIX getopt and go stdlib flag.
-
Short flag, single character or a string here to support golang CLI style
- Compact flags if possible. Also the sticking value will be parsed. For example:
-c1b23zv=-c 1 -b 23 -z -v - Hit info:
-v -v -v=-v(hitCount == 3, hitTitle == 'v') - Optimized for slice:
-a 1,2,3 -a 4 -a 5,6=> []int{1,2,3,4,5,6} - Value can be sticked or not. Valid forms:
-c1,-c 1,-c=1and quoted:-c"1",-c'1',-c="1",-c='1', etc. - ...
- Compact flags if possible. Also the sticking value will be parsed. For example:
-
Long flags and aliases
-
Eventual subcommands: an
OnActionhandler can be attached. -
Eventual subcommands and flags: PreActions, PostAction, OnMatching, OnMatched, ...,
-
Auto bind to environment variables, For instance: command line
HELP=1 app=app --help. -
Builtin commands and flags:
--help,-h--version,-V--verbose.-v- ...
-
Help Screen: auto generate and print
-
Smart suggestions when wrong cmd or flag parsed. Jaro-winkler distance is used.
-
-
Loosely parse subcmds and flags:
- Subcommands and flags can be input in any order
- Lookup a flag along with subcommands tree for resolving the duplicated flags
-
Can integrate with hedzr/store1
- High-performance in-memory KV store for hierarchical data.
- Extract data to user-spec type with auto-converting
- Loadable external sources: environ, config files, consul, etcd, etc..
- extensible codecs and providers for loading from data sources
-
Three kinds of config files are searched and loaded via
loaders.NewConfigFileLoader():- Primary: main config, shipped with installable package.
- Secondary: 2ndry config. Wrapped by reseller(s).
- Alternative: user's local config, writeable. The runtime changeset will be written back to this file while app stopping.
-
TODO
- Shell autocompletion
- ...
More minor details need to be evaluated and reimplemented if it's still meaningful in v2.
v2 is staying in earlier state:
-
Latest: v2.0.3
- split loaders as a standalone repo
- split examples and tests to standalone
- update deps
- fix bugs
-
Full list: CHANGELOG
A simple cli-app can be:
package main
import (
logz "github.com/hedzr/logg/slog"
"github.com/hedzr/cmdr/v2"
"github.com/hedzr/cmdr/v2/cli"
"github.com/hedzr/cmdr/v2/loaders"
"github.com/hedzr/cmdr/v2/pkg/dir"
"github.com/hedzr/store"
)
func main() {
app := prepareApp()
// // simple run the parser of app and trigger the matched command's action
// _ = app.Run(
// cmdr.WithForceDefaultAction(false), // true for debug in developing time
// )
if err := app.Run(
cmdr.WithStore(store.New()),
cmdr.WithExternalLoaders(
loaders.NewConfigFileLoader(),
loaders.NewEnvVarLoader(),
),
cmdr.WithForceDefaultAction(true), // true for debug in developing time
); err != nil {
logz.Error("Application Error:", "err", err)
}
}
func prepareApp() (app cli.App) {
app = cmdr.New().
Info("demo-app", "0.3.1").
Author("hedzr")
app.AddFlg(func(b cli.FlagBuilder) {
b.Titles("no-default").
Description("disable force default action").
OnMatched(func(f *cli.Flag, position int, hitState *cli.MatchState) (err error) {
app.Store().Set("app.force-default-action", false)
return
})
})
app.AddCmd(func(b cli.CommandBuilder) {
b.Titles("jump").
Description("jump command").
Examples(`jump example`).
Deprecated(`jump is a demo command`).
Hidden(false)
b.AddCmd(func(b cli.CommandBuilder) {
b.Titles("to").
Description("to command").
Examples(``).
Deprecated(`v0.1.1`).
Hidden(false).
OnAction(func(cmd *cli.Command, args []string) (err error) {
app.Store().Set("app.demo.working", dir.GetCurrentDir())
println()
println(dir.GetCurrentDir())
println()
println(app.Store().Dump())
return // handling command action here
})
b.AddFlg(func(b cli.FlagBuilder) {
b.Default(false).
Titles("full", "f").
Description("full command").
Build()
})
})
})
app.AddFlg(func(b cli.FlagBuilder) {
b.Titles("dry-run", "n").
Default(false).
Description("run all but without committing")
})
app.Flg("wet-run", "w").
Default(false).
Description("run all but with committing").
Build() // no matter even if you're adding the duplicated one.
return
}Thanks to JetBrains for donating product licenses to help develop cmdr
Since v2, our license moved to Apache 2.0.
The v1 keeps under MIT itself.
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