Add Python Shell Type and .python_history (#204680)

* Add Python Shell type and history

* remove one comment

* remove unncessary

* Why can't I manually override setShellType

* Detect python shell type on Windows

* fire shellType in _sendProcessTitle

* Detect python shell type on Windows

* delete comment

* remove more comments

* remove comment

* remove dup

* clean up

* more comprehensive regex for windows python

* follow previous style for map key name

* remove unused variable

* remove comment

* last cleanup

* More cleanup

* more clean up

* re-arrange

* remove unused

---------

Co-authored-by: Daniel Imms <2193314+Tyriar@users.noreply.github.com>

src/vs/platform/terminal/common/terminal.ts

@@ -140,12 +140,14 @@ export const enum PosixShellType {
 	Csh = 'csh',
 	Ksh = 'ksh',
 	Zsh = 'zsh',
+	Python = 'python'
 }
 export const enum WindowsShellType {
 	CommandPrompt = 'cmd',
 	PowerShell = 'pwsh',
 	Wsl = 'wsl',
-	GitBash = 'gitbash'
+	GitBash = 'gitbash',
+	Python = 'python'
 }
 export type TerminalShellType = PosixShellType | WindowsShellType;
 

src/vs/platform/terminal/node/terminalProcess.ts

@@ -73,6 +73,7 @@ const posixShellTypeMap = new Map<string, PosixShellType>([
 	['ksh', PosixShellType.Ksh],
 	['sh', PosixShellType.Sh],
 	['pwsh', PosixShellType.PowerShell],
+	['python', PosixShellType.Python],
 	['zsh', PosixShellType.Zsh]
 ]);
 
@@ -404,7 +405,12 @@ export class TerminalProcess extends Disposable implements ITerminalChildProcess
 		this._onDidChangeProperty.fire({ type: ProcessPropertyType.Title, value: this._currentTitle });
 		// If fig is installed it may change the title of the process
 		const sanitizedTitle = this.currentTitle.replace(/ \(figterm\)$/g, '');
-		this._onDidChangeProperty.fire({ type: ProcessPropertyType.ShellType, value: posixShellTypeMap.get(sanitizedTitle) });
+
+		if (sanitizedTitle.toLowerCase().startsWith('python')) {
+			this._onDidChangeProperty.fire({ type: ProcessPropertyType.ShellType, value: PosixShellType.Python });
+		} else {
+			this._onDidChangeProperty.fire({ type: ProcessPropertyType.ShellType, value: posixShellTypeMap.get(sanitizedTitle) });
+		}
 	}
 
 	shutdown(immediate: boolean): void {

src/vs/platform/terminal/node/windowsShellHelper.ts

@@ -152,6 +152,9 @@ export class WindowsShellHelper extends Disposable implements IWindowsShellHelpe
 			case 'sles-12.exe':
 				return WindowsShellType.Wsl;
 			default:
+				if (executable.match(/python(\d(\.\d{0,2})?)?\.exe/)) {
+					return WindowsShellType.Python;
+				}
 				return undefined;
 		}
 	}

src/vs/workbench/contrib/terminal/browser/terminalInstance.ts

@@ -118,6 +118,7 @@ const shellIntegrationSupportedShellTypes = [
 	PosixShellType.Bash,
 	PosixShellType.Zsh,
 	PosixShellType.PowerShell,
+	PosixShellType.Python,
 	WindowsShellType.PowerShell
 ];
 

src/vs/workbench/contrib/terminal/common/history.ts

@@ -92,6 +92,9 @@ export async function getShellFileHistory(accessor: ServicesAccessor, shellType:
 		case PosixShellType.Fish:
 			result = await fetchFishHistory(accessor);
 			break;
+		case PosixShellType.Python:
+			result = await fetchPythonHistory(accessor);
+			break;
 		default: return [];
 	}
 	if (result === undefined) {
@@ -295,6 +298,30 @@ export async function fetchZshHistory(accessor: ServicesAccessor) {
 	return result.values();
 }
 
+
+export async function fetchPythonHistory(accessor: ServicesAccessor): Promise<IterableIterator<string> | undefined> {
+	const fileService = accessor.get(IFileService);
+	const remoteAgentService = accessor.get(IRemoteAgentService);
+
+	const content = await fetchFileContents(env['HOME'], '.python_history', false, fileService, remoteAgentService);
+
+	if (content === undefined) {
+		return undefined;
+	}
+
+	// Python history file is a simple text file with one command per line
+	const fileLines = content.split('\n');
+	const result: Set<string> = new Set();
+
+	fileLines.forEach(line => {
+		if (line.trim().length > 0) {
+			result.add(line.trim());
+		}
+	});
+
+	return result.values();
+}
+
 export async function fetchPwshHistory(accessor: ServicesAccessor) {
 	const fileService: Pick<IFileService, 'readFile'> = accessor.get(IFileService);
 	const remoteAgentService: Pick<IRemoteAgentService, 'getConnection' | 'getEnvironment'> = accessor.get(IRemoteAgentService);