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/sys/ps.go

@@ -6,10 +6,10 @@ import (
 	"strings"
 	"time"
 
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
-func processGenerator(tokens []string, _ string, _ string) []core.Suggestion {
+func processGenerator(tokens []string, _ string, _ string) []spec.Suggestion {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 
@@ -21,7 +21,7 @@ func processGenerator(tokens []string, _ string, _ string) []core.Suggestion {
 	}
 
 	seen := make(map[string]bool)
-	var results []core.Suggestion
+	var results []spec.Suggestion
 	for line := range strings.SplitSeq(string(out), "\n") {
 		line = strings.TrimSpace(line)
 		if line == "" {
@@ -40,17 +40,17 @@ func processGenerator(tokens []string, _ string, _ string) []core.Suggestion {
 		// suggest both PID and process name
 		if !seen[pid] {
 			seen[pid] = true
-			results = append(results, core.Suggestion{Cmd: pid, Desc: name})
+			results = append(results, spec.Suggestion{Cmd: pid, Desc: name})
 		}
 	}
 	return results
 }
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "ps",
 		Description: "report processes",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-e", Description: "all processes"},
 			{Name: "-f", Description: "full format"},
 			{Name: "-u", Description: "by user"},
@@ -61,11 +61,11 @@ func init() {
 		},
 	})
 
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "kill",
 		Description: "send signal to process",
 		Generator:   processGenerator,
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-9", Description: "SIGKILL (force)"},
 			{Name: "-15", Description: "SIGTERM (graceful)"},
 			{Name: "-2", Description: "SIGINT"},
@@ -74,11 +74,11 @@ func init() {
 		},
 	})
 
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "killall",
 		Description: "kill by process name",
 		Generator:   processGenerator,
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-9", Description: "SIGKILL"},
 			{Name: "-s", Description: "specify signal"},
 			{Name: "-u", Description: "only for user"},
@@ -86,20 +86,20 @@ func init() {
 		},
 	})
 
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "pkill",
 		Description: "kill by pattern",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-9", Description: "SIGKILL"},
 			{Name: "-f", Description: "match full command"},
 			{Name: "-u", Description: "match by user"},
 		},
 	})
 
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "pgrep",
 		Description: "find process by pattern",
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "-l", Description: "list name and PID"},
 			{Name: "-f", Description: "match full command"},
 			{Name: "-u", Description: "match by user"},