move around code

change package to flag-gen to avoid conflict with flag-generator binary
test code generation

flag-gen/templates/altsrc_flags_generated.gotpl

@@ -0,0 +1,36 @@
+// Code generated by fg; DO NOT EDIT.
+
+package {{ .PackageName }}
+
+import (
+	"flag"
+    "github.com/urfave/cli"
+)
+
+{{ range $i, $flag := .Flags }}
+// {{ $flag.Name }}Flag is the flag type that wraps cli.{{ $flag.Name }}Flag to allow
+// for other values to be specified
+type {{ $flag.Name }}Flag struct {
+    cli.{{ $flag.Name }}Flag
+    set *flag.FlagSet
+}
+
+// New{{ $flag.Name }}Flag creates a new {{ $flag.Name }}Flag
+func New{{ $flag.Name }}Flag(fl cli.{{ $flag.Name }}Flag) *{{ $flag.Name }}Flag {
+    return &{{ $flag.Name }}Flag{ {{ $flag.Name }}Flag: fl, set: nil }
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped {{ $flag.Name }}Flag.Apply
+func (f *{{ $flag.Name }}Flag) Apply(set *flag.FlagSet) {
+	f.set = set
+	f.{{ $flag.Name }}Flag.Apply(set)
+}
+
+// ApplyWithError saves the flagSet for later usage calls, then calls
+// the wrapped {{ $flag.Name }}Flag.ApplyWithError
+func (f *{{ $flag.Name }}Flag) ApplyWithError(set *flag.FlagSet) error {
+    f.set = set
+    return f.{{ $flag.Name }}Flag.ApplyWithError(set)
+}
+{{- end }}

flag-gen/templates/cli_flags_generated.gotpl

@@ -0,0 +1,69 @@
+// Code generated by fg; DO NOT EDIT.
+
+package {{ .PackageName }}
+
+import (
+	"flag"
+	"strconv"
+	"time"
+)
+{{ range $i, $flag := .Flags }}
+// {{ $flag.Name }}Flag is a flag with type {{ $flag.Type }}{{ $flag.Doctail }}
+type {{ $flag.Name }}Flag struct {
+    Name        string
+    Usage       string
+    EnvVar      string
+    FilePath    string
+    Required    bool
+    Hidden      bool
+    {{- if eq $flag.Value true }}
+	Value		{{ $flag.Type }}
+	{{- end }}
+	{{- if eq $flag.Destination true }}
+	Destination	*{{ $flag.Type }}
+	{{- end }}
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f {{ $flag.Name }}Flag) String() string {
+    return FlagStringer(f)
+}
+
+// GetName returns the name of the flag
+func (f {{ $flag.Name }}Flag) GetName() string {
+    return f.Name
+}
+
+// IsRequired returns whether or not the flag is required
+func (f {{ $flag.Name }}Flag) IsRequired() bool {
+    return f.Required
+}
+
+// {{ $flag.Name }} looks up the value of a local {{ $flag.Name }}Flag, returns
+// {{ $flag.ContextDefault }} if not found
+func (c *Context) {{ $flag.Name }}(name string) {{ if ne .ContextType "" }} {{ $flag.ContextType }} {{ else }} {{ $flag.Type }} {{- end }} {
+    return lookup{{ $flag.Name }}(name, c.flagSet)
+}
+
+// Global{{ $flag.Name }} looks up the value of a global {{ $flag.Name }}Flag, returns
+// {{ $flag.ContextDefault }} if not found
+func (c *Context) Global{{ $flag.Name }}(name string) {{ if ne .ContextType "" }} {{ $flag.ContextType }} {{ else }} {{ $flag.Type }} {{- end }} {
+    if fs := lookupGlobalFlagSet(name, c); fs != nil {
+        return lookup{{ $flag.Name }}(name, fs)
+    }
+    return {{ $flag.ContextDefault }}
+}
+
+func lookup{{ $flag.Name }}(name string, set *flag.FlagSet) {{ if ne .ContextType "" }} {{ $flag.ContextType }} {{ else }} {{ $flag.Type }} {{- end }} {
+    f := set.Lookup(name)
+    if f != nil {
+        {{ if ne .Parser "" }}parsed, err := {{ $flag.Parser }}{{ else }}parsed, err := f.Value, error(nil){{ end }}
+        if err != nil {
+            return {{ $flag.ContextDefault }}
+        }
+        {{ if ne .ParserCast "" }}return {{ $flag.ParserCast }}{{ else }}return parsed{{ end }}
+    }
+    return {{ $flag.ContextDefault }}
+}
+{{- end }}