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/fs/zoxide.go

@@ -12,17 +12,17 @@ import (
 	"strings"
 
 	"github.com/versenilvis/fuzzy"
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "z",
 		Description: "jump to directory",
 		MaxArgs:     0,
 		Generator:   ZoxideGenerator(),
 	})
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "zi",
 		Description: "jump to directory interactively",
 		MaxArgs:     0,
@@ -30,12 +30,12 @@ func init() {
 	})
 }
 
-func ZoxideGenerator() core.GeneratorFunc {
-	return func(tokens []string, prefix string, partial string) []core.Suggestion {
+func ZoxideGenerator() spec.GeneratorFunc {
+	return func(tokens []string, prefix string, partial string) []spec.Suggestion {
 		fullQuery := strings.Join(tokens[1:], " ")
-		localSuggestions := core.FileGenerator("/")(tokens, prefix, fullQuery)
+		localSuggestions := spec.FileGenerator("/")(tokens, prefix, fullQuery)
 
-		var zoxideSuggestions []core.Suggestion
+		var zoxideSuggestions []spec.Suggestion
 		cmd := exec.CommandContext(context.Background(), "zoxide", "query", "-l")
 		out, err := cmd.Output()
 		if err == nil {
@@ -55,7 +55,7 @@ func ZoxideGenerator() core.GeneratorFunc {
 				for i := 0; i < limit; i++ {
 					path := dirs[i]
 					display := strings.Replace(path, home, "~", 1)
-					zoxideSuggestions = append(zoxideSuggestions, core.Suggestion{
+					zoxideSuggestions = append(zoxideSuggestions, spec.Suggestion{
 						Cmd:  path,
 						Desc: display,
 					})
@@ -66,7 +66,7 @@ func ZoxideGenerator() core.GeneratorFunc {
 				for _, m := range matches {
 					path := m.Str
 					display := strings.Replace(path, home, "~", 1)
-					zoxideSuggestions = append(zoxideSuggestions, core.Suggestion{
+					zoxideSuggestions = append(zoxideSuggestions, spec.Suggestion{
 						Cmd:  path,
 						Desc: display,
 					})
@@ -74,7 +74,7 @@ func ZoxideGenerator() core.GeneratorFunc {
 			}
 		}
 
-		var finalResults []core.Suggestion
+		var finalResults []spec.Suggestion
 		seen := make(map[string]bool)
 
 		finalResults = append(finalResults, localSuggestions...)