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377 lines
8.7 KiB
Go
377 lines
8.7 KiB
Go
package cli
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import (
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"errors"
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"flag"
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"strconv"
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"strings"
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"time"
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)
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// Context is a type that is passed through to
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// each Handler action in a cli application. Context
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// can be used to retrieve context-specific Args and
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// parsed command-line options.
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type Context struct {
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App *App
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Command Command
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flagSet *flag.FlagSet
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setFlags map[string]bool
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globalSetFlags map[string]bool
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parentContext *Context
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}
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// Creates a new context. For use in when invoking an App or Command action.
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func NewContext(app *App, set *flag.FlagSet, parentCtx *Context) *Context {
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return &Context{App: app, flagSet: set, parentContext: parentCtx}
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}
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// Looks up the value of a local int flag, returns 0 if no int flag exists
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func (c *Context) Int(name string) int {
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return lookupInt(name, c.flagSet)
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}
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// Looks up the value of a local time.Duration flag, returns 0 if no time.Duration flag exists
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func (c *Context) Duration(name string) time.Duration {
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return lookupDuration(name, c.flagSet)
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}
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// Looks up the value of a local float64 flag, returns 0 if no float64 flag exists
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func (c *Context) Float64(name string) float64 {
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return lookupFloat64(name, c.flagSet)
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}
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// Looks up the value of a local bool flag, returns false if no bool flag exists
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func (c *Context) Bool(name string) bool {
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return lookupBool(name, c.flagSet)
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}
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// Looks up the value of a local boolT flag, returns false if no bool flag exists
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func (c *Context) BoolT(name string) bool {
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return lookupBoolT(name, c.flagSet)
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}
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// Looks up the value of a local string flag, returns "" if no string flag exists
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func (c *Context) String(name string) string {
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return lookupString(name, c.flagSet)
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}
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// Looks up the value of a local string slice flag, returns nil if no string slice flag exists
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func (c *Context) StringSlice(name string) []string {
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return lookupStringSlice(name, c.flagSet)
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}
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// Looks up the value of a local int slice flag, returns nil if no int slice flag exists
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func (c *Context) IntSlice(name string) []int {
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return lookupIntSlice(name, c.flagSet)
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}
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// Looks up the value of a local generic flag, returns nil if no generic flag exists
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func (c *Context) Generic(name string) interface{} {
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return lookupGeneric(name, c.flagSet)
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}
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// Looks up the value of a global int flag, returns 0 if no int flag exists
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func (c *Context) GlobalInt(name string) int {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupInt(name, fs)
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}
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return 0
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}
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// Looks up the value of a global time.Duration flag, returns 0 if no time.Duration flag exists
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func (c *Context) GlobalDuration(name string) time.Duration {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupDuration(name, fs)
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}
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return 0
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}
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// Looks up the value of a global bool flag, returns false if no bool flag exists
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func (c *Context) GlobalBool(name string) bool {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupBool(name, fs)
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}
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return false
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}
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// Looks up the value of a global string flag, returns "" if no string flag exists
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func (c *Context) GlobalString(name string) string {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupString(name, fs)
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}
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return ""
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}
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// Looks up the value of a global string slice flag, returns nil if no string slice flag exists
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func (c *Context) GlobalStringSlice(name string) []string {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupStringSlice(name, fs)
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}
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return nil
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}
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// Looks up the value of a global int slice flag, returns nil if no int slice flag exists
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func (c *Context) GlobalIntSlice(name string) []int {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupIntSlice(name, fs)
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}
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return nil
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}
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// Looks up the value of a global generic flag, returns nil if no generic flag exists
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func (c *Context) GlobalGeneric(name string) interface{} {
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if fs := lookupParentFlagSet(name, c); fs != nil {
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return lookupGeneric(name, fs)
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}
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return nil
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}
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// Returns the number of flags set
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func (c *Context) NumFlags() int {
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return c.flagSet.NFlag()
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}
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// Determines if the flag was actually set
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func (c *Context) IsSet(name string) bool {
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if c.setFlags == nil {
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c.setFlags = make(map[string]bool)
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c.flagSet.Visit(func(f *flag.Flag) {
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c.setFlags[f.Name] = true
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})
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}
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return c.setFlags[name] == true
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}
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// Determines if the global flag was actually set
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func (c *Context) GlobalIsSet(name string) bool {
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if c.globalSetFlags == nil {
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c.globalSetFlags = make(map[string]bool)
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for ctx := c.parentContext; ctx != nil && c.globalSetFlags[name] == false; ctx = ctx.parentContext {
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ctx.flagSet.Visit(func(f *flag.Flag) {
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c.globalSetFlags[f.Name] = true
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})
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}
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}
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return c.globalSetFlags[name]
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}
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// Returns a slice of flag names used in this context.
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func (c *Context) FlagNames() (names []string) {
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for _, flag := range c.Command.Flags {
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name := strings.Split(flag.getName(), ",")[0]
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if name == "help" {
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continue
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}
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names = append(names, name)
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}
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return
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}
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// Returns a slice of global flag names used by the app.
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func (c *Context) GlobalFlagNames() (names []string) {
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for _, flag := range c.App.Flags {
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name := strings.Split(flag.getName(), ",")[0]
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if name == "help" || name == "version" {
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continue
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}
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names = append(names, name)
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}
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return
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}
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type Args []string
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// Returns the command line arguments associated with the context.
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func (c *Context) Args() Args {
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args := Args(c.flagSet.Args())
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return args
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}
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// Returns the nth argument, or else a blank string
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func (a Args) Get(n int) string {
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if len(a) > n {
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return a[n]
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}
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return ""
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}
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// Returns the first argument, or else a blank string
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func (a Args) First() string {
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return a.Get(0)
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}
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// Return the rest of the arguments (not the first one)
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// or else an empty string slice
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func (a Args) Tail() []string {
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if len(a) >= 2 {
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return []string(a)[1:]
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}
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return []string{}
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}
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// Checks if there are any arguments present
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func (a Args) Present() bool {
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return len(a) != 0
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}
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// Swaps arguments at the given indexes
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func (a Args) Swap(from, to int) error {
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if from >= len(a) || to >= len(a) {
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return errors.New("index out of range")
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}
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a[from], a[to] = a[to], a[from]
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return nil
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}
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func lookupParentFlagSet(name string, ctx *Context) *flag.FlagSet {
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for ctx := ctx.parentContext; ctx != nil; ctx = ctx.parentContext {
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if f := ctx.flagSet.Lookup(name); f != nil {
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return ctx.flagSet
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}
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}
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return nil
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}
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func lookupInt(name string, set *flag.FlagSet) int {
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f := set.Lookup(name)
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if f != nil {
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val, err := strconv.Atoi(f.Value.String())
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if err != nil {
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return 0
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}
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return val
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}
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return 0
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}
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func lookupDuration(name string, set *flag.FlagSet) time.Duration {
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f := set.Lookup(name)
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if f != nil {
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val, err := time.ParseDuration(f.Value.String())
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if err == nil {
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return val
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}
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}
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return 0
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}
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func lookupFloat64(name string, set *flag.FlagSet) float64 {
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f := set.Lookup(name)
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if f != nil {
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val, err := strconv.ParseFloat(f.Value.String(), 64)
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if err != nil {
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return 0
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}
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return val
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}
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return 0
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}
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func lookupString(name string, set *flag.FlagSet) string {
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f := set.Lookup(name)
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if f != nil {
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return f.Value.String()
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}
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return ""
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}
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func lookupStringSlice(name string, set *flag.FlagSet) []string {
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f := set.Lookup(name)
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if f != nil {
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return (f.Value.(*StringSlice)).Value()
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}
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return nil
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}
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func lookupIntSlice(name string, set *flag.FlagSet) []int {
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f := set.Lookup(name)
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if f != nil {
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return (f.Value.(*IntSlice)).Value()
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}
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return nil
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}
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func lookupGeneric(name string, set *flag.FlagSet) interface{} {
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f := set.Lookup(name)
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if f != nil {
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return f.Value
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}
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return nil
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}
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func lookupBool(name string, set *flag.FlagSet) bool {
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f := set.Lookup(name)
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if f != nil {
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val, err := strconv.ParseBool(f.Value.String())
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if err != nil {
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return false
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}
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return val
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}
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return false
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}
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func lookupBoolT(name string, set *flag.FlagSet) bool {
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f := set.Lookup(name)
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if f != nil {
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val, err := strconv.ParseBool(f.Value.String())
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if err != nil {
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return true
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}
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return val
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}
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return false
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}
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func copyFlag(name string, ff *flag.Flag, set *flag.FlagSet) {
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switch ff.Value.(type) {
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case *StringSlice:
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default:
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set.Set(name, ff.Value.String())
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}
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}
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func normalizeFlags(flags []Flag, set *flag.FlagSet) error {
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visited := make(map[string]bool)
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set.Visit(func(f *flag.Flag) {
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visited[f.Name] = true
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})
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for _, f := range flags {
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parts := strings.Split(f.getName(), ",")
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if len(parts) == 1 {
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continue
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}
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var ff *flag.Flag
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for _, name := range parts {
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name = strings.Trim(name, " ")
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if visited[name] {
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if ff != nil {
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return errors.New("Cannot use two forms of the same flag: " + name + " " + ff.Name)
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}
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ff = set.Lookup(name)
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}
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}
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if ff == nil {
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continue
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}
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for _, name := range parts {
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name = strings.Trim(name, " ")
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if !visited[name] {
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copyFlag(name, ff, set)
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}
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}
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}
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return nil
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}
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