Extension that is "work in progress" because of a vscode bug

remove-empty-lines.js

const vscode = require('vscode')
const cl_regex = new RegExp(/^\s*$/, "g")

function count_empty_lines()
{
	let editor = vscode.window.activeTextEditor

	if(!editor)
	{
		return false
	}

	let num_matches = 0
	let count = 0

	for(let i=0; i < editor.document.lineCount; i++)
	{
		if(editor.document.lineAt(i).text.match(cl_regex))
		{
			count += 1
		}

		else
		{
			if(count >= 2)
			{
				num_matches += 1
			}

			count = 0
		}
	}

	let s = "Sets of Multiple Empty Lines were found."
	let s2 = "Remove Them"

	if(num_matches === 1)
	{
		s = "Set of Multiple Empty Lines was found."
		s2 = "Remove It"
	}

	if(num_matches > 0)
	{
		vscode.window.showInformationMessage(`${num_matches} ${s}`, "Go", s2)

		.then(function(selection)
		{
			if(selection === s2)
			{
				remove_empty_lines()
			}

			else if(selection === "Go")
			{
				go_to_empty_lines()
			}
		})
	}

	else
	{
		vscode.window.showInformationMessage(`${num_matches} ${s}`)
	}
}

function go_to_empty_lines()
{
	let editor = vscode.window.activeTextEditor

	if(!editor)
	{
		return false
	}

	let count = 0
	let cline = false

	for(let i=0; i < editor.document.lineCount; i++)
	{
		let line = editor.document.lineAt(i)

		if(line.text.match(cl_regex))
		{
			count += 1

			if(count === 2)
			{
				cline = line
			}
		}

		else
		{
			if(count >= 2)
			{
				editor.selection =  new vscode.Selection(cline.range.start, cline.range.end)
				editor.revealRange(cline.range)
				return true
			}

			count = 0
			cline = false
		}
	}
}

function remove_empty_lines()
{
	let editor = vscode.window.activeTextEditor

	if(!editor)
	{
		return false
	}

	let num_matches = 0
	let count = 0
	let ranges = []

	editor.edit(function(builder)
	{
		for(let i=0; i < editor.document.lineCount; i++)
		{
			let line = editor.document.lineAt(i)

			if(line.text.match(cl_regex))
			{
				count += 1

				if(count >= 2)
				{
					ranges.push(line.rangeIncludingLineBreak)
				}
			}

			else
			{
				if(count >= 2)
				{
					num_matches += 1

					for(let range of ranges)
					{
						builder.delete(range)
					}
				}

				count = 0
				ranges = []
			}
		}
	})

	let s = "Sets of Multiple Empty Lines were removed."

	if(num_matches === 1)
	{
		s = "Set of Multiple Empty Lines was removed."
	}

	vscode.window.showInformationMessage(`${num_matches} ${s}`)
}

function activate(context) 
{
	let disposable
	
	disposable = vscode.commands.registerCommand('extension.count_empty_lines', function() 
	{
		count_empty_lines()
	})

	context.subscriptions.push(disposable)

	disposable = vscode.commands.registerCommand('extension.remove_empty_lines', function() 
	{
		remove_empty_lines()
	})

	context.subscriptions.push(disposable)
}

exports.activate = activate

function deactivate() {}

module.exports = 
{
	activate,
	deactivate
}