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go-rpm-macros/SOURCES/golist-bootstrap-cli-no-ven...

323 lines
7.7 KiB

diff --git a/cmd/golist/golist.go b/cmd/golist/golist.go
index ee028ae..e9c038d 100644
--- a/cmd/golist/golist.go
+++ b/cmd/golist/golist.go
@@ -11,9 +11,8 @@ import (
"strings"
"text/template"
- "github.com/urfave/cli"
-
"pagure.io/golist/pkg/util"
+ "pagure.io/golist/pkg/cli"
)
var (
@@ -100,7 +99,6 @@ func main() {
}
app.Action = func(c *cli.Context) error {
-
if len(c.StringSlice("package-path")) == 0 {
return fmt.Errorf("--package-path is not set")
}
diff --git a/pkg/cli/cli.go b/pkg/cli/cli.go
new file mode 100644
index 0000000..ec91056
--- /dev/null
+++ b/pkg/cli/cli.go
@@ -0,0 +1,293 @@
+package cli
+
+/* golist uses a very small portion of functionality
+ from github.com/urfave/cli. This module provides
+ minimal substitute API implementations for only the
+ core functionality used by golist, for the purpose of
+ bootstrapping golist without additional dependencies.
+*/
+
+import (
+ "strings"
+ "fmt"
+ "os"
+)
+
+type String string
+type StringSlice []string
+type Bool bool
+
+type Flag interface {
+ name() string
+ usage() string
+}
+
+type BoolFlag struct {
+ Name string
+ Usage string
+ Value bool
+}
+
+type StringFlag struct {
+ Name string
+ Usage string
+ Value string
+}
+
+type StringSliceFlag struct {
+ Name string
+ Usage string
+ Value *StringSlice
+}
+
+type App struct {
+ Name string
+ Usage string
+ Version string
+ Flags []Flag
+ Action func(*Context) error
+
+}
+
+func NewApp() App {
+ var a App
+ return a
+}
+
+func (a *App) Run(osArgs []string) error {
+ c, err := newContext(a.Flags, osArgs)
+ if err != nil {
+ return err
+ }
+ if c.Bool("help") {
+ a.PrintHelp()
+ os.Exit(0)
+ }
+ return a.Action(c)
+}
+
+func (a *App) PrintHelp() {
+ maxNameLen := 0
+ for _, flag := range a.Flags {
+ length := len(flag.name())
+ if length > maxNameLen {
+ maxNameLen = length
+ }
+ }
+ fmtSpec := "%-" + fmt.Sprintf("%v", maxNameLen + 6) + "s\t%s\n"
+ fmt.Printf("%s - %s\n", a.Name, a.Usage)
+ fmt.Printf("Options:\n")
+ for _, flag := range a.Flags {
+ flagNameSlice := append([]string{canonicalName(flag)}, alternateNames(flag)...)
+ for i, _ := range flagNameSlice {
+ if len(flagNameSlice[i]) > 1 {
+ flagNameSlice[i] = fmt.Sprintf("--%s", flagNameSlice[i])
+ } else {
+ flagNameSlice[i] = fmt.Sprintf("-%s", flagNameSlice[i])
+ }
+ }
+ flagNameStr := strings.Join(flagNameSlice, ", ")
+ switch flag.(type) {
+ case StringFlag:
+ flagNameStr = fmt.Sprintf(" %s value", flagNameStr)
+ case StringSliceFlag:
+ flagNameStr = fmt.Sprintf(" %s value", flagNameStr)
+ case BoolFlag:
+ flagNameStr = fmt.Sprintf(" %s", flagNameStr)
+ }
+ fmt.Printf(fmtSpec, flagNameStr, flag.usage())
+ }
+}
+
+
+type Context struct {
+ flagValues map[string]interface{}
+ flagDecls map[string]Flag
+ altFlags map[string]string
+ positionalArgs []string
+}
+
+func (c *Context) Bool(flag string) bool {
+ iface, ok := c.flagDecls[flag]
+ if !ok {
+ panic("undefined flag" + flag)
+ }
+ switch iface.(type) {
+ case BoolFlag:
+ break
+ default:
+ panic("flag type mismatch - expected BoolFlag, got: " + flag)
+ }
+ val, ok := c.flagValues[flag]
+ if !ok {
+ return iface.(BoolFlag).Value
+ }
+ return val.(bool)
+}
+
+func (c *Context) String(flag string) string {
+ iface, ok := c.flagDecls[flag]
+ if !ok {
+ panic("undefined flag" + flag)
+ }
+ switch iface.(type) {
+ case StringFlag:
+ break
+ default:
+ panic("flag type mismatch - expected StringFlag, got: " + flag)
+ }
+ val, ok:= c.flagValues[flag]
+ if !ok {
+ return iface.(StringFlag).Value
+ }
+ return val.(string)
+}
+
+func (c *Context) StringSlice(flag string) []string {
+ iface, ok := c.flagDecls[flag];
+ if !ok {
+ panic("undefined flag" + flag)
+ }
+ switch iface.(type) {
+ case StringSliceFlag:
+ break
+ default:
+ panic("flag type mismatch - expected StringSliceFlag, got: " + flag)
+ }
+ val, ok := c.flagValues[flag]
+ if !ok {
+ val = iface.(StringSliceFlag).Value
+ if val != nil {
+ return []string{}
+ }
+ }
+ return val.([]string)
+}
+
+// Create a hash mapping from flag names to declarations
+// and alt names to flag names.
+func (c *Context) setupFlags(flagDecls []Flag) error {
+ helpFlag := BoolFlag {
+ Name: "help, h",
+ Usage: "Show help message",
+ }
+ flagDecls = append(flagDecls, helpFlag)
+ for _, flag := range flagDecls {
+ flagName := canonicalName(flag)
+ if _, ok:= c.flagDecls[flagName]; ok {
+ return fmt.Errorf("cannot redeclare flag: %s", flagName)
+ }
+ c.flagDecls[flagName] = flag
+ altFlagNames := alternateNames(flag)
+ for _, altName := range altFlagNames {
+ c.altFlags[altName] = flagName
+ }
+ }
+ return nil
+}
+
+func (c *Context) parseArgs(osArgs []string) error {
+ // process command line arguments as a stream of tokens.
+ // operations consume the first token in the stream until
+ // the stream is empty.
+ argStream := osArgs
+ for len(argStream) > 0 {
+ arg := argStream[0]
+ if ! isFlag(arg) {
+ argStream = argStream[1:]
+ c.positionalArgs = append(c.positionalArgs, arg)
+
+ } else {
+ arg = trimFlag(arg)
+ if _, ok:= c.altFlags[arg]; ok {
+ arg = c.altFlags[arg]
+ }
+ iface, ok := c.flagDecls[arg]
+ if !ok {
+ return fmt.Errorf("unexpected argument: %v", arg)
+ }
+ switch flag := iface.(type) {
+ case StringFlag:
+ argStream = argStream[1:]
+ if len(argStream) == 0 {
+ return fmt.Errorf("expected value for argument: %v", arg)
+ }
+ if isFlag(argStream[0]) {
+ return fmt.Errorf("unexpected flag: %v", arg)
+ }
+ c.flagValues[arg] = argStream[0]
+ case StringSliceFlag:
+ argStream = argStream[1:]
+ if len (argStream) == 0 {
+ return fmt.Errorf("expected value for argument: %v", arg)
+ }
+ if isFlag(argStream[0]) {
+ return fmt.Errorf("unexpected flag: %v", arg)
+ }
+ c.flagValues[arg] = make([]string, 0)
+ c.flagValues[arg] = append(c.flagValues[arg].([]string), argStream[0])
+ argStream = argStream[1:]
+ for len(argStream) > 0 && ! isFlag(argStream[0]) {
+ c.flagValues[arg] = append(c.flagValues[arg].([]string), argStream[0])
+ argStream = argStream[1:]
+ }
+ case BoolFlag:
+ argStream = argStream[1:]
+ c.flagValues[canonicalName(flag)] = true
+ default:
+ return fmt.Errorf("unexpected flag: %v", arg)
+ }
+ }
+ }
+ return nil
+}
+
+func newContext(flags []Flag, osArgs []string) (*Context, error) {
+ var c Context
+ c.flagValues = make(map[string]interface{})
+ c.flagDecls = make(map[string]Flag)
+ c.altFlags = make(map[string]string)
+ c.altFlags = make(map[string]string)
+ if err := c.setupFlags(flags); err != nil {
+ return nil, err
+ }
+ if err := c.parseArgs(osArgs); err != nil {
+ return nil, err
+ }
+ return &c, nil
+}
+
+func (f StringFlag) name() string {return f.Name}
+func (f StringFlag) usage() string {return f.Usage}
+func (f BoolFlag) name() string {return f.Name}
+func (f BoolFlag) usage() string {return f.Usage}
+func (f StringSliceFlag) name() string {return f.Name}
+func (f StringSliceFlag) usage() string {return f.Usage}
+
+// takes a Flag with a comma delimited string
+// of flag names and returns the first one
+func canonicalName(flag Flag) string {
+ flagNames := strings.Split(flag.name(), ",")
+ return strings.TrimSpace(flagNames[0])
+}
+
+// takes a Flag with a comma delimited string
+// of flag names and returns them as a string slice
+// with the canonical (first) flag ommitted
+func alternateNames(flag Flag) []string {
+ flagNames := strings.Split(flag.name(), ",")
+ altNames := flagNames[1:]
+ for i, _ := range altNames {
+ altNames[i] = strings.TrimSpace(altNames[i])
+ }
+ return altNames
+}
+
+func isFlag(arg string) bool {
+ return strings.HasPrefix(arg, "-")
+}
+
+func trimFlag(arg string) string {
+ return strings.Trim(strings.Trim(arg, "-"), "-")
+}
+