Add PythonEnvInfo-related helpers. (#14051)

This PR adds some basic helpers that we use in a subsequent PR. The following small drive-by changes are also included:

* drop PythonEnvInfo.id property
* make some internal helpers public

src/client/common/utils/misc.ts

@@ -130,6 +130,53 @@ export function isUri(resource?: Uri | any): resource is Uri {
     return typeof uri.path === 'string' && typeof uri.scheme === 'string';
 }
 
+/**
+ * Create a filter func that determine if the given URI and candidate match.
+ *
+ * The scheme must match, as well as path.
+ *
+ * @param checkParent - if `true`, match if the candidate is rooted under `uri`
+ * @param checkChild - if `true`, match if `uri` is rooted under the candidate
+ * @param checkExact - if `true`, match if the candidate matches `uri` exactly
+ */
+export function getURIFilter(
+    uri: Uri,
+    opts: {
+        checkParent?: boolean;
+        checkChild?: boolean;
+        checkExact?: boolean;
+    } = { checkExact: true }
+): (u: Uri) => boolean {
+    let uriPath = uri.path;
+    while (uri.path.endsWith('/')) {
+        uriPath = uriPath.slice(0, -1);
+    }
+    const uriRoot = `${uriPath}/`;
+    function filter(candidate: Uri): boolean {
+        if (candidate.scheme !== uri.scheme) {
+            return false;
+        }
+        let candidatePath = candidate.path;
+        while (candidate.path.endsWith('/')) {
+            candidatePath = candidatePath.slice(0, -1);
+        }
+        if (opts.checkExact && candidatePath === uriPath) {
+            return true;
+        }
+        if (opts.checkParent && candidatePath.startsWith(uriRoot)) {
+            return true;
+        }
+        if (opts.checkChild) {
+            const candidateRoot = `{candidatePath}/`;
+            if (uriPath.startsWith(candidateRoot)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    return filter;
+}
+
 export function isNotebookCell(documentOrUri: TextDocument | Uri): boolean {
     const uri = isUri(documentOrUri) ? documentOrUri : documentOrUri.uri;
     return uri.scheme.includes(NotebookCellScheme);

src/client/pythonEnvironments/base/info/env.ts

@@ -3,14 +3,123 @@
 
 import { cloneDeep } from 'lodash';
 import * as path from 'path';
+import { Architecture } from '../../../common/utils/platform';
+import { arePathsSame } from '../../common/externalDependencies';
+import { areEqualVersions, areEquivalentVersions } from './pythonVersion';
+
 import {
     FileInfo,
     PythonDistroInfo,
-    PythonEnvInfo, PythonEnvKind, PythonVersion,
+    PythonEnvInfo,
+    PythonEnvKind,
+    PythonReleaseLevel,
+    PythonVersion,
 } from '.';
-import { Architecture } from '../../../common/utils/platform';
-import { arePathsSame } from '../../common/externalDependencies';
-import { areEqualVersions, areEquivalentVersions } from './pythonVersion';
+
+/**
+ * Create a new info object with all values empty.
+ *
+ * @param init - if provided, these values are applied to the new object
+ */
+export function buildEnvInfo(init?: {
+    kind?: PythonEnvKind;
+    executable?: string;
+    location?: string;
+    version?: PythonVersion;
+}): PythonEnvInfo {
+    const env = {
+        kind: PythonEnvKind.Unknown,
+        executable: {
+            filename: '',
+            sysPrefix: '',
+            ctime: -1,
+            mtime: -1,
+        },
+        name: '',
+        location: '',
+        version: {
+            major: -1,
+            minor: -1,
+            micro: -1,
+            release: {
+                level: PythonReleaseLevel.Final,
+                serial: 0,
+            },
+        },
+        arch: Architecture.Unknown,
+        distro: {
+            org: '',
+        },
+    };
+    if (init !== undefined) {
+        updateEnv(env, init);
+    }
+    return env;
+}
+
+/**
+ * Return a deep copy of the given env info.
+ *
+ * @param updates - if provided, these values are applied to the copy
+ */
+export function copyEnvInfo(
+    env: PythonEnvInfo,
+    updates?: {
+        kind?: PythonEnvKind,
+    },
+): PythonEnvInfo {
+    // We don't care whether or not extra/hidden properties
+    // get preserved, so we do the easy thing here.
+    const copied = cloneDeep(env);
+    if (updates !== undefined) {
+        updateEnv(copied, updates);
+    }
+    return copied;
+}
+
+function updateEnv(env: PythonEnvInfo, updates: {
+    kind?: PythonEnvKind;
+    executable?: string;
+    location?: string;
+    version?: PythonVersion;
+}): void {
+    if (updates.kind !== undefined) {
+        env.kind = updates.kind;
+    }
+    if (updates.executable !== undefined) {
+        env.executable.filename = updates.executable;
+    }
+    if (updates.location !== undefined) {
+        env.location = updates.location;
+    }
+    if (updates.version !== undefined) {
+        env.version = updates.version;
+    }
+}
+
+/**
+ * For the given data, build a normalized partial info object.
+ *
+ * If insufficient data is provided to generate a minimal object, such
+ * that it is not identifiable, then `undefined` is returned.
+ */
+export function getMinimalPartialInfo(env: string | Partial<PythonEnvInfo>): Partial<PythonEnvInfo> | undefined {
+    if (typeof env === 'string') {
+        if (env === '') {
+            return undefined;
+        }
+        return {
+            executable: { filename: env, sysPrefix: '', ctime: -1, mtime: -1 },
+        };
+    }
+    if (env.executable === undefined) {
+        return undefined;
+    }
+    if (env.executable.filename === '') {
+        return undefined;
+    }
+    return env;
+}
 
 /**
  * Checks if two environments are same.
@@ -24,14 +133,20 @@ import { areEqualVersions, areEquivalentVersions } from './pythonVersion';
  * to be same environment. This later case is needed for comparing windows store python,
  * where multiple versions of python executables are all put in the same directory.
  */
-export function areSameEnvironment(
-    left: string | PythonEnvInfo,
-    right: string | PythonEnvInfo,
+export function areSameEnv(
+    left: string | Partial<PythonEnvInfo>,
+    right: string | Partial<PythonEnvInfo>,
     allowPartialMatch?: boolean,
-): boolean {
-    const leftFilename = typeof left === 'string' ? left : left.executable.filename;
-    const rightFilename = typeof right === 'string' ? right : right.executable.filename;
+): boolean | undefined {
+    const leftInfo = getMinimalPartialInfo(left);
+    const rightInfo = getMinimalPartialInfo(right);
+    if (leftInfo === undefined || rightInfo === undefined) {
+        return undefined;
+    }
+    const leftFilename = leftInfo.executable!.filename;
+    const rightFilename = rightInfo.executable!.filename;
 
+    // For now we assume that matching executable means they are the same.
     if (arePathsSame(leftFilename, rightFilename)) {
         return true;
     }
@@ -72,11 +187,11 @@ function getPythonVersionInfoHeuristic(version:PythonVersion): number {
         infoLevel += 5; // W2
     }
 
-    if (version.release.level) {
+    if (version.release?.level) {
         infoLevel += 3; // W1
     }
 
-    if (version.release.serial || version.sysVersion) {
+    if (version.release?.serial || version.sysVersion) {
         infoLevel += 1; // W0
     }
 

src/client/pythonEnvironments/base/info/index.ts

@@ -28,6 +28,11 @@ export enum PythonEnvKind {
     OtherVirtual = 'virt-other'
 }
 
+/**
+ * A (system-global) unique ID for a single Python environment.
+ */
+export type PythonEnvID = string;
+
 /**
  * Information about a file.
  */
@@ -44,11 +49,6 @@ export type PythonExecutableInfo = FileInfo & {
     sysPrefix: string;
 };
 
-/**
- * A (system-global) unique ID for a single Python environment.
- */
-export type PythonEnvID = string;
-
 /**
  * The most fundamental information about a Python environment.
  *
@@ -63,7 +63,6 @@ export type PythonEnvID = string;
  * @prop location - the env's location (on disk), if relevant
  */
 export type PythonEnvBaseInfo = {
-    id: PythonEnvID;
     kind: PythonEnvKind;
     executable: PythonExecutableInfo;
     // One of (name, location) must be non-empty.
@@ -99,7 +98,7 @@ export type PythonVersionRelease = {
  * @prop sysVersion - the raw text from `sys.version`
  */
 export type PythonVersion = BasicVersionInfo & {
-    release: PythonVersionRelease;
+    release?: PythonVersionRelease;
     sysVersion?: string;
 };
 

src/client/pythonEnvironments/base/info/pythonVersion.ts

@@ -1,9 +1,13 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-import { PythonReleaseLevel, PythonVersion } from '.';
 import { EMPTY_VERSION, parseBasicVersionInfo } from '../../../common/utils/version';
 
+import { PythonReleaseLevel, PythonVersion } from '.';
+
+/**
+ * Convert the given string into the corresponding Python version object.
+ */
 export function parseVersion(versionStr: string): PythonVersion {
     const parsed = parseBasicVersionInfo<PythonVersion>(versionStr);
     if (!parsed) {

src/client/pythonEnvironments/base/locator.ts

@@ -15,17 +15,18 @@ import {
  * A single update to a previously provided Python env object.
  */
 export type PythonEnvUpdatedEvent = {
+    /**
+     * The iteration index of The env info that was previously provided.
+     */
+    index: number;
     /**
      * The env info that was previously provided.
-     *
-     * If the event comes from `IPythonEnvsIterator.onUpdated` then
-     * `old` was previously yielded during iteration.
      */
-    old: PythonEnvInfo;
+    old?: PythonEnvInfo;
     /**
      * The env info that replaces the old info.
      */
-    new: PythonEnvInfo;
+    update: PythonEnvInfo;
 };
 
 /**
@@ -73,23 +74,39 @@ export const NOOP_ITERATOR: IPythonEnvsIterator = iterEmpty<PythonEnvInfo>();
  * This is directly correlated with the `BasicPythonEnvsChangedEvent`
  * emitted by watchers.
  *
- * @prop kinds - if provided, results should be limited to these env kinds
+ * @prop kinds - if provided, results should be limited to these env
+ *               kinds; if not provided, the kind of each evnironment
+ *               is not considered when filtering
  */
 export type BasicPythonLocatorQuery = {
     kinds?: PythonEnvKind[];
 };
 
+/**
+ * The portion of a query related to env search locations.
+ */
+export type SearchLocations = {
+    /**
+     * The locations under which to look for environments.
+     */
+    roots: Uri[];
+    /**
+     * If true, also look for environments that do not have a search location.
+     */
+    includeNonRooted?: boolean;
+};
+
 /**
  * The full set of possible info to send to a locator when requesting environments.
  *
  * This is directly correlated with the `PythonEnvsChangedEvent`
  * emitted by watchers.
- *
- * @prop - searchLocations - if provided, results should be limited to
- *         within these locations
  */
 export type PythonLocatorQuery = BasicPythonLocatorQuery & {
-    searchLocations?: Uri[];
+    /**
+     * If provided, results should be limited to within these locations.
+     */
+    searchLocations?: SearchLocations;
 };
 
 type QueryForEvent<E> = E extends PythonEnvsChangedEvent ? PythonLocatorQuery : BasicPythonLocatorQuery;