Fix: issue #4 and #5 (#6)

- Issue #4: currently there is no official release yet so we cant
download from installer
- I added an installer debugger here to test
(f091dbf13bdf109b631951e2558651f560ca8b84)
- Issue #5: my another library
[fuzzy](https://github.com/versenilvis/fuzzy/) has a logic bug so it
causes crash, fix d479c6cb4d8453e50366c9839daaabb45a98a2df

- Other:
  -  remove unneeded comments (edd9d05fdd16e682b6b416913e2fa9c3f6599956)
  - Add some tests
  - Fix reload crash (3a76e78e655fd8daafb635ec0937667325f75ee4)
- New optimized build command (56a4a815f836271b861f32795d2df3b25a3dffc0)

tests/core/lookup_test.go

@@ -2,6 +2,7 @@ package tests
 
 import (
 	"strings"
+	"sync"
 	"testing"
 
 	"github.com/versenilvis/iris/commands/core"
@@ -31,21 +32,13 @@ func TestLookup(t *testing.T) {
 		minResults  int
 		mustContain string
 	}{
-		// REQUIREMENT: Token 1, no trailing space -> top-level suggestions
 		{"Top-level", "gi", 1, "git"},
-		// REQUIREMENT: Token 1, with trailing space -> subcommand suggestions
 		{"Subcommand", "git ", 1, "git commit"},
-		// REQUIREMENT: Alias expansion (gca -> git commit -a)
 		{"Alias expansion", "gca", 1, "git commit -a"},
-		// REQUIREMENT: Alias value with space (ta -> tmux a -t)
 		{"Alias with space", "ta", 1, "tmux a -t"},
-		// REQUIREMENT: Subcommand depth 2+ (git remote add)
 		{"Deep subcommand", "git remote ", 1, "git remote add"},
-		// REQUIREMENT: Option dedup (do not suggest --verbose if already typed)
-		{"Option dedup", "git --verbose -", 0, ""}, 
-		// REQUIREMENT: --flag=value does not count into argCount
+		{"Option dedup", "git --verbose -", 0, ""},
 		{"Flag with value ignore", "git --output=json ", 2, "git --output=json commit"},
-		// REQUIREMENT: Unknown root command -> nil
 		{"Unknown root command", "unknowncmd ", 0, ""},
 	}
 
@@ -70,3 +63,33 @@ func TestLookup(t *testing.T) {
 		})
 	}
 }
+
+func TestLookupConcurrent(t *testing.T) {
+	core.Registry = make(map[string]*core.Spec)
+	core.Register(&core.Spec{
+		Name: "git",
+		Subcommands: []core.Subcommand{
+			{Name: "commit", Options: []core.Option{{Name: "--message"}}, MaxArgs: 1},
+		},
+	})
+
+	core.ShellAliases = map[string]string{
+		"gca": "git commit -a",
+	}
+
+	var wg sync.WaitGroup
+	const goroutines = 10
+	const iterations = 50
+
+	for range goroutines {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for range iterations {
+				_ = core.Lookup("gca")
+				_ = core.Lookup("git ")
+			}
+		}()
+	}
+	wg.Wait()
+}