first commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitignore

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+/node_modules
+/cjs
+/esm
+/umd

.mocharc.json

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+{
+  "$schema": "https://json.schemastore.org/mocharc",
+  "require": ["ts-node/register"],
+  "spec": "index.spec.ts",
+  "extension": ["ts"]
+}

.npmignore

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+/.*
+/scripts
+/cjs/*.spec.*
+/esm/*.spec.*

.prettierrc

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+{
+  "quoteProps": "consistent",
+  "singleQuote": true,
+  "printWidth": 160
+}

.vscode/settings.json

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+{
+  "editor.formatOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.fixAll": true
+  }
+}

LICENSE

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+Copyright (C) 2021 by NiceLabs <[email protected]>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

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+# expandvars
+
+Inspired from Python's `os.expanduser` and `os.expandvars`.
+
+## LICENE
+
+[Zero Clause BSD](LICENSE)

index.spec.ts

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+import { assert } from 'chai';
+import 'mocha';
+import { expandUser, expandVars } from './index';
+import { homedir } from 'os';
+
+describe('expanduser', () => {
+  const fakeHome = '/home/example';
+
+  it('unbound', () => {
+    assert.equal(expandUser('~'), homedir());
+  });
+
+  it('$HOME', () => {
+    const expand = expandUser.bind({ HOME: fakeHome });
+    assert.equal(expand('~'), fakeHome);
+  });
+
+  it('$USERPROFILE', () => {
+    const expand = expandUser.bind({ USERPROFILE: fakeHome });
+    assert.equal(expand('~'), fakeHome);
+  });
+});
+
+describe('expandvars', () => {
+  it('constants', () => {
+    assert.equal(expandVars('FOO'), 'FOO');
+    assert.equal(expandVars('$'), '$');
+    assert.equal(expandVars('BAR$'), 'BAR$');
+  });
+
+  it('empty', () => {
+    assert.equal(expandVars(''), '');
+    assert.equal(expandVars('$FOO'), '$FOO');
+  });
+
+  it('simple', () => {
+    const expand = expandVars.bind({ FOO: 'bar' });
+    assert.equal(expand('$FOO'), 'bar');
+    assert.equal(expand('${FOO}'), 'bar');
+  });
+
+  it('combo', () => {
+    const expand = expandVars.bind({ FOO: 'bar', BIZ: 'buz' });
+    assert.equal(expand('${FOO}:$BIZ'), 'bar:buz');
+    assert.equal(expand('$FOO$BIZ'), 'barbuz');
+    assert.equal(expand('${FOO}$BIZ'), 'barbuz');
+    assert.equal(expand('$FOO${BIZ}'), 'barbuz');
+    assert.equal(expand('$FOO-$BIZ'), 'bar-buz');
+    assert.equal(expand('boo$BIZ'), 'boobuz');
+    assert.equal(expand('boo${BIZ}'), 'boobuz');
+  });
+});

index.ts

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+export type Environ = Record<string, string | undefined>;
+
+export function expandUser(input: string, environ: Environ = process.env) {
+  if (typeof input !== 'string') {
+    throw new Error('The input type not is string');
+  }
+  const home = environ.HOME ?? environ.USERPROFILE;
+  return home ? input.replace(/^~/g, home) : input;
+}
+
+expandUser.bind = (environ: Environ) => (input: string) => expandUser(input, environ);
+
+export function expandVars(input: string, environ: Environ = process.env) {
+  if (typeof input !== 'string') {
+    throw new Error('The input type not is string');
+  }
+  if (input.indexOf('$') === -1) {
+    return input;
+  }
+  return input.replace(/\$(\w+|\{[^}]*\})/g, (match, p1: string) => {
+    if (p1[0] === '{' && p1[p1.length - 1] === '}') {
+      p1 = p1.slice(1, -1);
+    }
+    return environ[p1] ?? match;
+  });
+}
+
+expandVars.bind = (environ: Environ) => (input: string) => expandVars(input, environ);