add globsearch option for wildcard searching

Mentioned in #69.

comp.go

@@ -53,6 +53,9 @@ var (
 		"dirfirst",
 		"nodirfirst",
 		"dirfirst!",
+		"globsearch",
+		"noglobsearch",
+		"globsearch!",
 		"hidden",
 		"nohidden",
 		"hidden!",

doc.go

@@ -70,6 +70,7 @@ The following options can be used to customize the behavior of lf:
 
     dircounts   boolean  (default off)
     dirfirst    boolean  (default on)
+    globsearch  boolean  (default off)
     hidden      boolean  (default off)
     preview     boolean  (default on)
     reverse     boolean  (default off)

docstring.go

@@ -74,6 +74,7 @@ The following options can be used to customize the behavior of lf:
 
     dircounts   boolean  (default off)
     dirfirst    boolean  (default on)
+    globsearch  boolean  (default off)
     hidden      boolean  (default off)
     preview     boolean  (default on)
     reverse     boolean  (default off)

eval.go

@@ -26,6 +26,12 @@ func (e *setExpr) eval(app *app, args []string) {
 	case "dirfirst!":
 		gOpts.dirfirst = !gOpts.dirfirst
 		app.nav.renew(app.nav.height)
+	case "globsearch":
+		gOpts.globsearch = true
+	case "noglobsearch":
+		gOpts.globsearch = false
+	case "globsearch!":
+		gOpts.globsearch = !gOpts.globsearch
 	case "hidden":
 		gOpts.hidden = true
 		app.nav.renew(app.nav.height)
@@ -297,11 +303,21 @@ func (e *callExpr) eval(app *app, args []string) {
 	case "search-back":
 		app.ui.cmdpref = "?"
 	case "search-next":
-		app.nav.searchNext()
+		if err := app.nav.searchNext(); err != nil {
+			msg := fmt.Sprintf("search: %s: %s", err, app.nav.search)
+			app.ui.message = msg
+			log.Printf(msg)
+			return
+		}
 		app.ui.loadFile(app.nav)
 		app.ui.loadFileInfo(app.nav)
 	case "search-prev":
-		app.nav.searchPrev()
+		if err := app.nav.searchPrev(); err != nil {
+			msg := fmt.Sprintf("search: %s: %s", err, app.nav.search)
+			app.ui.message = msg
+			log.Printf(msg)
+			return
+		}
 		app.ui.loadFile(app.nav)
 		app.ui.loadFileInfo(app.nav)
 	case "toggle":
@@ -448,15 +464,25 @@ func (e *callExpr) eval(app *app, args []string) {
 		case "/":
 			log.Printf("search: %s", s)
 			app.nav.search = s
-			app.nav.searchNext()
+			if err := app.nav.searchNext(); err != nil {
+				msg := fmt.Sprintf("search: %s: %s", err, app.nav.search)
+				app.ui.message = msg
+				log.Printf(msg)
+			} else {
 				app.ui.loadFile(app.nav)
 				app.ui.loadFileInfo(app.nav)
+			}
 		case "?":
 			log.Printf("search-back: %s", s)
 			app.nav.search = s
-			app.nav.searchPrev()
+			if err := app.nav.searchPrev(); err != nil {
+				msg := fmt.Sprintf("search: %s: %s", err, app.nav.search)
+				app.ui.message = msg
+				log.Printf(msg)
+			} else {
 				app.ui.loadFile(app.nav)
 				app.ui.loadFileInfo(app.nav)
+			}
 		default:
 			log.Printf("entering unknown execution prefix: %q", app.ui.cmdpref)
 		}

nav.go

@@ -368,40 +368,66 @@ func (nav *nav) cd(wd string) error {
 	return nil
 }
 
-func (nav *nav) searchNext() {
+func match(pattern, name string) (matched bool, err error) {
+	if gOpts.globsearch {
+		return filepath.Match(pattern, name)
+	} else {
+		return strings.Contains(name, pattern), nil
+	}
+}
+
+func (nav *nav) searchNext() error {
 	last := nav.currDir()
 	for i := last.ind + 1; i < len(last.fi); i++ {
-		if strings.Contains(last.fi[i].Name(), nav.search) {
+		matched, err := match(nav.search, last.fi[i].Name())
+		if err != nil {
+			return err
+		}
+		if matched {
 			nav.down(i - last.ind)
-			return
+			return nil
 		}
 	}
 	if gOpts.wrapscan {
 		for i := 0; i < last.ind; i++ {
-			if strings.Contains(last.fi[i].Name(), nav.search) {
+			matched, err := match(nav.search, last.fi[i].Name())
+			if err != nil {
+				return err
+			}
+			if matched {
 				nav.up(last.ind - i)
-				return
+				return nil
 			}
 		}
 	}
+	return nil
 }
 
-func (nav *nav) searchPrev() {
+func (nav *nav) searchPrev() error {
 	last := nav.currDir()
 	for i := last.ind - 1; i >= 0; i-- {
-		if strings.Contains(last.fi[i].Name(), nav.search) {
+		matched, err := match(nav.search, last.fi[i].Name())
+		if err != nil {
+			return err
+		}
+		if matched {
 			nav.up(last.ind - i)
-			return
+			return nil
 		}
 	}
 	if gOpts.wrapscan {
 		for i := len(last.fi) - 1; i > last.ind; i-- {
-			if strings.Contains(last.fi[i].Name(), nav.search) {
+			matched, err := match(nav.search, last.fi[i].Name())
+			if err != nil {
+				return err
+			}
+			if matched {
 				nav.down(i - last.ind)
-				return
+				return nil
 			}
 		}
 	}
+	return nil
 }
 
 func (nav *nav) toggleMark(path string) {

opts.go

@@ -5,6 +5,7 @@ import "time"
 var gOpts struct {
 	dircounts  bool
 	dirfirst   bool
+	globsearch bool
 	hidden     bool
 	preview    bool
 	reverse    bool
@@ -27,6 +28,7 @@ var gOpts struct {
 func init() {
 	gOpts.dircounts = false
 	gOpts.dirfirst = true
+	gOpts.globsearch = false
 	gOpts.hidden = false
 	gOpts.preview = true
 	gOpts.reverse = false