Created a *.mmip build script

.gitignore

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+dist
+node_modules

.vscode/launch.json

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+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Run Build script",
+			"program": "${workspaceFolder}\\build.js"
+		}
+	]
+}

build.js

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+const ini = require('multi-ini');
+const zipdir = require('zip-dir');
+const semver = require('semver');
+const packagejson = require('./package.json');
+
+let fullverstring = '';
+const version = packagejson.version;
+const file = './source/Install.ini';
+const content = ini.read(file);
+
+if (
+	content &&
+	content.Header &&
+	content.Header.VersionBuild
+) {
+	const head = content.Header;
+
+	head.VersionMajor = `${semver(version).major}`;
+	head.VersionMinor = `${semver(version).minor}`;
+	head.VersionRelease = `${semver(version).patch}`;
+	head.VersionBuild = `${Number(head.VersionBuild) + 1}`;
+
+	fullverstring = [
+		head.VersionMajor, 
+		head.VersionMinor, 
+		head.VersionRelease, 
+		head.VersionBuild
+	].join('.');
+	ini.write(file, content);
+}
+zipdir('./source', {
+	saveTo: `./dist/Lyrics To Instrumental v${fullverstring}.mmip`
+}, () => {
+
+});

package.json

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+{
+  "name": "lyrics-to-instrumental",
+  "version": "1.0.0",
+  "description": "Mediamonkey plugin: Toolbar button to set lyrics to instrumental for the currently selected songs",
+  "main": "build.js",
+  "scripts": {
+    "build": "node build.js"
+  },
+  "author": "Tom A. Vibeto <[email protected]> (https://onlyhuman.dk)",
+  "license": "ISC",
+  "dependencies": {
+    "clean-stacktrace": "^1.1.0",
+    "multi-ini": "^2.0.0",
+    "semver": "^5.5.0",
+    "zip-dir": "^1.0.2"
+  }
+}

source/Install.ini

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+[Header]
+ID="LyricsToInstrumental"
+Title="Lyrics To Instrumental"
+Description="Toolbar button to set lyrics to instrumental for the currently selected songs"
+VersionMajor="1"
+VersionMinor="0"
+VersionRelease="0"
+VersionBuild="1"
+Type="script"
+[Copy]
+Src="LyricsToInstrumental.vbs"
+Tgt="{app}\Scripts\Auto\LyricsToInstrumental.vbs"
+[Execute]
+File="{app}\Scripts\Auto\LyricsToInstrumental.vbs"
+Function="OnStartup()"

source/LyricsToInstrumental.vbs

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+' A script adding a button, that sets lyrics to "Instrumental"
+
+Sub OnStartup
+  Dim btn : Set btn = SDB.Objects("LyricsInsrumentalButton")
+  If btn Is Nothing Then
+    Set btn = SDB.UI.AddMenuItem(SDB.UI.Menu_TbStandard,0,0)
+    btn.Caption = "Lyrics to Instrumental"
+    btn.IconIndex = 17
+    Set SDB.Objects("LyricsInsrumentalButton") = btn
+  End If
+  Call Script.UnRegisterHandler("btnClick")
+  Call Script.RegisterEvent(btn,"OnClick","btnClick")
+End Sub
+
+Sub btnClick(btn)
+  Call LyricsToInstrumental()
+End Sub
+
+Sub LyricsToInstrumental
+  ' Define variables
+  Dim list
+  Dim itm
+  Dim i
+
+  ' Get list of selected tracks from MediaMonkey
+  Set list = SDB.SelectedSongList 
+  If list.count>0 Then 
+    ' Process all selected tracks
+    For i=0 To list.count-1
+      Set itm = list.Item(i)
+      itm.Lyrics = "Instrumental"
+      ' Update the changes in DB
+      itm.UpdateDB
+    Next
+  End If  
+End Sub

source/Uninstall.ini

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+[Delete]
+File={app}\Scripts\Auto\LyricsToInstrumental.vbs
+
+[Execute]
+File=Uninstall.vbs
+

source/Uninstall.vbs

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+Dim but : Set but = SDB.Objects("LyricsInsrumentalButton")
+If Not (but Is Nothing) Then
+  but.Visible = False
+  Set SDB.Objects("LyricsInsrumentalButton") = Nothing
+End If