Add code

.gitignore

@@ -80,7 +80,7 @@ typings/
 
 # Nuxt.js build / generate output
 .nuxt
-dist
+# dist
 
 # Gatsby files
 .cache/

README.md

@@ -1,2 +1,33 @@
 # pep440conv
 Simple stdin/stdout-based utilities for converting to and from PEP-440 semver strings.
+
+## Requirements
+
+- Node.js 14 or newer
+
+## Installation
+
+The pep440conv utility can be installed using `npm`:
+
+```sh
+npm -g pep440conv
+```
+
+## Usage
+
+Usage is very straightforward. Once the packge is installed `frompep440` and `topep440` become available from the
+command line:
+
+```bash
+$ # Converting from a regular semver string to to PEP-440.
+$ echo '1.0.0-rc.1' | topep440
+1.0.0-rc1
+
+$ # Converting from PEP-440 to a regular semver string.
+$ echo '1.0.0-rc1' | frompep440
+1.0.0-rc.1
+```
+
+## License
+
+[MIT](LICENSE) © [lambdacasserole](https://github.com/lambdacasserole).

fromPep440.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+
+import getStdin from 'get-stdin';
+
+
+/**
+ * Transforms a PEP-440 compatible version string token into a regular semver string token.
+ *
+ * @param {string} token the token to transform
+ * @returns {string} the transformed token
+ */
+function fromPep440Token(token) {
+    const chars = []
+    let dotted = false
+    token.split('').forEach((c)=> {
+        if (/[0-9]/.test(c) && !dotted) {
+            chars.push('.');
+            dotted = true;
+        }
+        chars.push(c);
+    })
+    return chars.join('');
+}
+
+/**
+ * Transforms a PEP-440 compatible version string into a regular semver string.
+ *
+ * @param {string} pepVersionStr the string to transform
+ * @returns {string} the transformed string
+ */
+function fromPep440(pepVersionStr) {
+    const tokens = pepVersionStr.split('-');
+    return [tokens[0], ...tokens.slice(1).map(fromPep440Token)].join('-');
+}
+
+
+(async () => {
+    const stdin = await getStdin();
+    console.log(fromPep440(stdin));
+})();

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "pep440conv",
+  "version": "1.0.0",
+  "description": "Simple stdin/stdout-based utilities for converting to and from PEP-440 semver strings.",
+  "type": "module",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lambdacasserole/incv.git"
+  },
+  "keywords": [
+    "version",
+    "pep",
+    "440",
+    "python",
+    "semver"
+  ],
+  "author": "Saul Johnson <saul.a.johnson@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/lambdacasserole/pep440conv/issues"
+  },
+  "homepage": "https://github.com/lambdacasserole/pep440conv#readme",
+  "bin": {
+    "topep440": "./toPep440.js",
+    "frompep440": "./fromPep440.js"
+  },
+  "dependencies": {
+    "get-stdin": "^9.0.0"
+  }
+}

toPep440.js

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+
+import getStdin from 'get-stdin';
+
+
+/**
+ * Transforms a regular semver string to a PEP-440 compatible version string.
+ *
+ * @param {string} semverStr the string to transform
+ * @returns {string} the transformed string
+ */
+function toPep440(semverStr) {
+    const tokens = semverStr.split('-');
+    return [tokens[0], ...tokens.slice(1).map((t) => t.replace('.', ''))].join('-');
+}
+
+
+(async () => {
+    const stdin = await getStdin();
+    console.log(toPep440(stdin));
+})();