Improve Windows compatibility (#5)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

index.js

@@ -2,6 +2,7 @@
 const os = require('os');
 const fs = require('fs');
 const path = require('path');
+const childProcess = require('child_process');
 
 function parse(string) {
 	const reBashHistory = /^: \d+:0;/;
@@ -19,10 +20,6 @@ function parse(string) {
 function getPath(options) {
 	options = options || {};
 
-	if (process.platform === 'win32') {
-		return '';
-	}
-
 	if (process.env.HISTFILE) {
 		return process.env.HISTFILE;
 	}
@@ -63,7 +60,13 @@ module.exports = options => {
 	options = options || {};
 
 	if (process.platform === 'win32') {
-		return [];
+		const historyPath = getPath(options);
+		if (historyPath) {
+			return parse(fs.readFileSync(historyPath, 'utf8'));
+		}
+
+		const {stdout} = childProcess.spawnSync('doskey', ['/history'], {encoding: 'utf8'});
+		return stdout.trim().split('\r\n');
 	}
 
 	return parse(fs.readFileSync(getPath(options), 'utf8'));

readme.md

@@ -29,12 +29,14 @@ console.log(shellHistory.path());
 
 Get an array of commands.
 
-On Windows it will always be an empty array as command history is not persisted there.
+On Windows, unless the `HISTFILE` environment variable is set, this will only return commands from the current session.
 
 ### shellHistory.path()
 
 Get the path of the file containing the shell history.
 
+On Windows, this will return either the `HISTFILE` environment variable or `undefined`.
+
 ### shellHistory.parse(string)
 
 Parse a shell history string into an array of commands.

test_win.bat

@@ -0,0 +1,13 @@
+:: Confirms that the batch file works correctly in Windows Terminal / Command Prompt.
+:: This batch file is used to visually test to see if `shell-history` works, rather
+:: than to act as a real, responsive "test case" (as such, `ava` is not used here).
+
+@echo off
+
+echo Print entire history
+node --print "const history = require('.'); history()"
+pause
+echo.
+echo Print last command (which will be "test_win.bat")
+node --print "const history = require('.'); let h = history(); h[h.length - 1]"
+pause