refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/text/textproc.go

@@ -1,16 +1,16 @@
 package text
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
 	// awk
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "awk",
 		Description: "pattern-directed scanning",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-F", Description: "field separator"},
 			{Name: "-v", Description: "assign variable"},
 			{Name: "-f", Description: "read program from file"},
@@ -21,11 +21,11 @@ func init() {
 	})
 
 	// gawk is also common
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "gawk",
 		Description: "GNU awk",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-F", Description: "field separator"},
 			{Name: "-v", Description: "assign variable"},
 			{Name: "-f", Description: "read program from file"},
@@ -36,11 +36,11 @@ func init() {
 	})
 
 	// sed
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "sed",
 		Description: "stream editor",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-e", Description: "add expression"},
 			{Name: "-f", Description: "read script from file"},
 			{Name: "-i", Description: "in-place edit"},
@@ -53,10 +53,10 @@ func init() {
 	})
 
 	// xargs
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "xargs",
 		Description: "build and run commands from stdin",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-I", Description: "replace string (e.g. -I{})"},
 			{Name: "-n", Description: "max args per command"},
 			{Name: "-P", Description: "parallel jobs"},
@@ -70,10 +70,10 @@ func init() {
 	})
 
 	// tr
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "tr",
 		Description: "translate or delete characters",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-d", Description: "delete characters"},
 			{Name: "-s", Description: "squeeze repeated chars"},
 			{Name: "-c", Description: "complement set"},
@@ -81,11 +81,11 @@ func init() {
 	})
 
 	// sort
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "sort",
 		Description: "sort lines of text",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-n", Description: "numeric sort"},
 			{Name: "-r", Description: "reverse sort"},
 			{Name: "-k", Description: "sort by key field"},
@@ -100,11 +100,11 @@ func init() {
 	})
 
 	// uniq
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "uniq",
 		Description: "filter adjacent duplicate lines",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-c", Description: "prefix count"},
 			{Name: "-d", Description: "only duplicates"},
 			{Name: "-u", Description: "only unique"},
@@ -115,11 +115,11 @@ func init() {
 	})
 
 	// cut
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "cut",
 		Description: "extract columns from lines",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-d", Description: "delimiter"},
 			{Name: "-f", Description: "field numbers (e.g. 1,3 or 1-3)"},
 			{Name: "-c", Description: "character positions"},
@@ -128,11 +128,11 @@ func init() {
 	})
 
 	// tee
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "tee",
 		Description: "read stdin, write to stdout and files",
-		Generator:   core.FileGenerator(),
-		Options: []core.Option{
+		Generator:   spec.FileGenerator(),
+		Options: []spec.Option{
 			{Name: "-a", Description: "append to files"},
 			{Name: "-i", Description: "ignore interrupts"},
 		},