update README.md

Update README.md

README.md

@@ -172,7 +172,7 @@ Edit `~/.config/nwg-drawer/drawer.css` to your taste.
 When the search phrase is at least 3 characters long, your XDG user directories are being searched.
 
 Use the **left mouse button** to open a file with the `xdg-open` command. As configuring file associations for it is
-PITA, you may override them, by creating the `~/.config/nwg-panel/preferred-apps.json` file with your own definitions.
+PITA, you may override them, by creating the `~/.config/nwg-drawer/preferred-apps.json` file with your own definitions.
 
 ### Sample `preferred-apps.json` file content
 
@@ -199,13 +199,29 @@ I've noy yet tried other file managers.
 ### File search exclusions
 
 You may want to exclude some paths inside your XDG user directories from searching. If so, define exclusions in the
-`~/.config/nwg-panel/excluded-dirs` file, e.g. like this:
+`~/.config/nwg-drawer/excluded-dirs` file, e.g. like this:
 
 ```text
 # exclude all paths containing 'node_modules'
 node_modules
 ```
 
+### Calculations in the search box
+
+If the search box is not empty, and you press Enter, the search box content will be evaluated as an arithmetic operation.
+If the result is not an error, it will be displayed in a small window, and copied to the clipboard with wl-copy.
+Press any key to close the window.
+
+You may change the result label styling e.g. like this:
+
+```css
+/* math operation result label */
+#math-label {
+    font-weight: bold;
+    font-size: 16px
+}
+```
+
 ## Credits
 
 This program uses some great libraries:
@@ -217,3 +233,4 @@ Copyright (c) 2015-2018 gotk3 contributors
 - [go-singleinstance](github.com/allan-simon/go-singleinstance) Copyright (c) 2015 Allan Simon
 - [logrus](https://github.com/sirupsen/logrus) Copyright (c) 2014 Simon Eskildsen
 - [fsnotify](https://github.com/fsnotify/fsnotify) Copyright (c) 2012-2019 fsnotify Authors
+- [expr](https://github.com/expr-lang/expr) Copyright (c) 2018 Anton Medvedev

drawer.css

@@ -32,3 +32,9 @@ button:hover {
     border: 1px dotted gray;
     border-radius: 15px
 }
+
+/* math operation result label */
+#math-label {
+    font-weight: bold;
+    font-size: 16px
+}

go.mod

@@ -1,6 +1,6 @@
 module github.com/nwg-piotr/nwg-drawer
 
-go 1.22
+go 1.23
 
 require (
 	github.com/allan-simon/go-singleinstance v0.0.0-20210120080615-d0997106ab37
@@ -12,8 +12,9 @@ require (
 )
 
 require (
+	github.com/expr-lang/expr v1.16.9 // indirect
 	github.com/joshuarubin/lifecycle v1.1.4 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
-	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
 )

go.sum

@@ -5,6 +5,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dlasky/gotk3-layershell v0.0.0-20240515133811-5c5115f0d774 h1:o87OVL4olQBlVwN3+NSVQpS6gj9FWUYtxOfHXWZigUE=
 github.com/dlasky/gotk3-layershell v0.0.0-20240515133811-5c5115f0d774/go.mod h1:JHLx2Wz4mAPVwn4PFhC69ydwyHP4A3wQvlg7HKVVc1U=
+github.com/expr-lang/expr v1.16.9 h1:WUAzmR0JNI9JCiF0/ewwHB1gmcGw5wW7nWt8gc6PpCI=
+github.com/expr-lang/expr v1.16.9/go.mod h1:8/vRC7+7HBzESEqt5kKpYXxrxkr31SaO8r40VO/1IT4=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/gotk3/gotk3 v0.6.1/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
@@ -37,6 +39,8 @@ golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
 golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"github.com/expr-lang/expr"
 	"os"
 	"os/signal"
 	"path"
@@ -21,7 +22,7 @@ import (
 	"github.com/gotk3/gotk3/gtk"
 )
 
-const version = "0.5.0"
+const version = "0.5.2"
 
 var (
 	appDirs          []string
@@ -432,6 +433,7 @@ func main() {
 
 	if wayland() {
 		layershell.InitForWindow(win)
+		layershell.SetNamespace(win, "nwg-drawer")
 
 		var output2mon map[string]*gdk.Monitor
 		if *targetOutput != "" {
@@ -493,12 +495,26 @@ func main() {
 				}
 			}
 			return true
+
 		} else if key.KeyVal() == gdk.KEY_Tab {
 			if firstPowerBtn != nil {
 				firstPowerBtn.ToWidget().GrabFocus()
 			}
+
+		} else if key.KeyVal() == gdk.KEY_Return {
+			s, _ := searchEntry.GetText()
+			if s != "" {
+				// Check if the search box content is an arithmetic expression. If so, display the result
+				// and copy to the clipboard with wl-copy.
+				result, err := expr.Eval(s, nil)
+				if err == nil {
+					log.Debugf("Setting up mathemathical operation result window. Operation: %s, result: %v", s, result)
+					setUpOperationResultWindow(s, fmt.Sprintf("%v", result))
 				}
-		return false
+			}
+			return true
+		}
+		return true
 	})
 
 	win.Connect("key-press-event", func(_ *gtk.Window, event *gdk.Event) bool {
@@ -512,8 +528,8 @@ func main() {
 			if !searchEntry.IsFocus() {
 				searchEntry.GrabFocusWithoutSelecting()
 			}
-			return false
 		}
+		return false
 	})
 
 	/*

tools.go

@@ -571,7 +571,7 @@ func savePinned() {
 	}
 }
 
-func launch(command string, terminal bool) {
+func launch(command string, terminal bool, terminate bool) {
 	// trim % and everything afterwards
 	if strings.Contains(command, "%") {
 		cutAt := strings.Index(command, "%")
@@ -615,7 +615,7 @@ func launch(command string, terminal bool) {
 		cmd = exec.Command("riverctl", "spawn", strings.Join(elements, " "))
 	}
 
-	msg := fmt.Sprintf("command: %q; args: %q\n", cmd.Args[0], cmd.Args[1:])
+	msg := fmt.Sprintf("Executing command: %q; args: %q\n", cmd.Args[0], cmd.Args[1:])
 	log.Info(msg)
 
 	cmd.SysProcAttr = &syscall.SysProcAttr{
@@ -632,12 +632,14 @@ func launch(command string, terminal bool) {
 		}()
 	}
 
+	if terminate {
 		if *resident {
 			restoreStateAndHide()
 		} else {
 			gtk.MainQuit()
 		}
 	}
+}
 
 func open(filePath string, xdgOpen bool) {
 	var cmd *exec.Cmd

uicomponents.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/dlasky/gotk3-layershell/layershell"
 	"io/fs"
 	"path/filepath"
 	"strings"
@@ -66,7 +67,7 @@ func setUpPinnedFlowBox() *gtk.FlowBox {
 			btn.Connect("button-release-event", func(row *gtk.Button, e *gdk.Event) bool {
 				btnEvent := gdk.EventButtonNewFromEvent(e)
 				if btnEvent.Button() == 1 {
-					launch(entry.Exec, entry.Terminal)
+					launch(entry.Exec, entry.Terminal, true)
 					return true
 				} else if btnEvent.Button() == 3 {
 					unpinItem(entry.DesktopID)
@@ -75,7 +76,7 @@ func setUpPinnedFlowBox() *gtk.FlowBox {
 				return false
 			})
 			btn.Connect("activate", func() {
-				launch(entry.Exec, entry.Terminal)
+				launch(entry.Exec, entry.Terminal, true)
 			})
 			btn.Connect("enter-notify-event", func() {
 				statusLabel.SetText(entry.CommentLoc)
@@ -274,7 +275,7 @@ func flowBoxButton(entry desktopEntry) *gtk.Button {
 		btnEvent := gdk.EventButtonNewFromEvent(e)
 		if btnEvent.Button() == 1 {
 			if !beenScrolled {
-				launch(exec, terminal)
+				launch(exec, terminal, true)
 				return true
 			}
 		} else if btnEvent.Button() == 3 {
@@ -284,7 +285,7 @@ func flowBoxButton(entry desktopEntry) *gtk.Button {
 		return false
 	})
 	button.Connect("activate", func() {
-		launch(exec, terminal)
+		launch(exec, terminal, true)
 	})
 	button.Connect("enter-notify-event", func() {
 		statusLabel.SetText(desc)
@@ -322,13 +323,13 @@ func powerButton(iconPathOrName, command string) *gtk.Button {
 	button.Connect("button-release-event", func(btn *gtk.Button, e *gdk.Event) bool {
 		btnEvent := gdk.EventButtonNewFromEvent(e)
 		if btnEvent.Button() == 1 {
-			launch(command, false)
+			launch(command, false, true)
 			return true
 		}
 		return false
 	})
 	button.Connect("activate", func() {
-		launch(command, false)
+		launch(command, false, true)
 	})
 	button.Connect("enter-notify-event", func() {
 		statusLabel.SetText(command)
@@ -584,3 +585,54 @@ func setUpUserFileSearchResultButton(fileName, filePath string) *gtk.Box {
 	box.PackStart(button, false, true, 0)
 	return box
 }
+
+func setUpOperationResultWindow(operation string, result string) {
+	win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
+	if err != nil {
+		log.Fatal("Unable to create result window:", err)
+	}
+	win.SetModal(true)
+
+	if wayland() {
+		layershell.InitForWindow(win)
+		layershell.SetLayer(win, layershell.LAYER_SHELL_LAYER_OVERLAY)
+		layershell.SetKeyboardMode(win, layershell.LAYER_SHELL_KEYBOARD_MODE_EXCLUSIVE)
+	}
+
+	// any key to close the window
+	win.Connect("key-release-event", func(_ *gtk.Window, event *gdk.Event) bool {
+		win.Destroy()
+		return true
+	})
+
+	// any button to close the window
+	win.Connect("button-release-event", func(_ *gtk.Window, event *gdk.Event) bool {
+		win.Destroy()
+		return true
+	})
+
+	outerVBox, _ := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 6)
+	win.Add(outerVBox)
+
+	vBox, _ := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 5)
+	outerVBox.PackStart(vBox, true, true, 6)
+	lbl, _ := gtk.LabelNew(fmt.Sprintf("%s = %s", operation, result))
+	lbl.SetProperty("name", "math-label")
+	vBox.PackStart(lbl, true, true, 12)
+
+	mRefProvider, _ := gtk.CssProviderNew()
+	css := "window { background-color: rgba (0, 0, 0, 255); color: #fff; border: solid 1px grey; border-radius: 5px}"
+	err = mRefProvider.LoadFromData(css)
+	if err != nil {
+		log.Warn(err)
+	}
+	ctx, _ := win.GetStyleContext()
+	ctx.AddProvider(mRefProvider, gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
+
+	win.ShowAll()
+
+	if wayland() {
+		cmd := fmt.Sprintf("wl-copy %v", result)
+		launch(cmd, false, false)
+	}
+}