autodetect powershell core path (fixes #382)

terminus-terminal/src/index.ts

@@ -35,6 +35,7 @@ import { GitBashShellProvider } from './shells/gitBash'
 import { LinuxDefaultShellProvider } from './shells/linuxDefault'
 import { MacOSDefaultShellProvider } from './shells/macDefault'
 import { POSIXShellsProvider } from './shells/posix'
+import { PowerShellCoreShellProvider } from './shells/powershellCore'
 import { WindowsStockShellsProvider } from './shells/windowsStock'
 import { WSLShellProvider } from './shells/wsl'
 
@@ -73,6 +74,7 @@ import { hterm } from './hterm'
         { provide: ShellProvider, useClass: Cygwin64ShellProvider, multi: true },
         { provide: ShellProvider, useClass: GitBashShellProvider, multi: true },
         { provide: ShellProvider, useClass: POSIXShellsProvider, multi: true },
+        { provide: ShellProvider, useClass: PowerShellCoreShellProvider, multi: true },
         { provide: ShellProvider, useClass: WSLShellProvider, multi: true },
     ],
     entryComponents: [

terminus-terminal/src/shells/powershellCore.ts

+import * as path from 'path'
+import { Injectable } from '@angular/core'
+import { HostAppService, Platform } from 'terminus-core'
+
+import { ShellProvider, IShell } from '../api'
+
+let Registry = null
+try {
+    Registry = require('winreg')
+} catch (_) { } // tslint:disable-line no-empty
+
+@Injectable()
+export class PowerShellCoreShellProvider extends ShellProvider {
+    constructor (
+        private hostApp: HostAppService,
+    ) {
+        super()
+    }
+
+    async provide (): Promise<IShell[]> {
+        if (this.hostApp.platform !== Platform.Windows) {
+            return []
+        }
+
+        let pwshPath = await new Promise<string>(resolve => {
+            let reg = new Registry({ hive: Registry.HKLM, key: '\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\pwsh.exe', arch: 'x64' })
+            reg.get('', (err, item) => {
+                if (err || !item) {
+                    return resolve(null)
+                }
+                resolve(item.value)
+            })
+        })
+
+        if (!pwshPath) {
+            return []
+        }
+
+        return [{
+            id: 'powershell-core',
+            name: 'PowerShell Core',
+            command: pwshPath,
+            env: {
+                TERM: 'cygwin',
+            }
+        }]
+    }
+}

terminus-terminal/src/shells/windowsStock.ts

@@ -42,14 +42,6 @@ export class WindowsStockShellsProvider extends ShellProvider {
                     TERM: 'cygwin',
                 }
             },
-            {
-                id: 'powershell-core',
-                name: 'PowerShell Core',
-                command: 'pwsh.exe',
-                env: {
-                    TERM: 'cygwin',
-                }
-            },
         ]
     }
 }