v0.1.0

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

Cargo.toml

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+[package]
+name = "penv"
+version = "0.1.0"
+authors = ["Jonas da Silva"]
+description = "Pretty Print Environment Variables"
+edition = "2021"
+repository = "https://github.com/phoenixr-codes/penv/"
+license = "MIT OR Unlicense"
+keywords = ["command-line", "env", "environment", "pretty"]
+categories = ["command-line-utilities", "visualization"]
+
+[dependencies]
+console = "0.15"
+glob = "0.3"

LICENSE.MIT

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+MI License
+
+Copyright (c) 2023 Jonas da Silva
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE.Unlicense

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+Thi is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
+s

README.md

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+# penv: Pretty Print Environment Variables
+
+## Installation
+
+```text
+cargo install penv
+```
+
+
+## Usage
+
+```text
+penv [pattern]
+```
+
+The `pattern` argument may be a [glob pattern](https://en.wikipedia.org/wiki/Glob_(programming)) used
+to only print variables that match the provided pattern.
+
+
+## Links
+
+* [📦 crates.io](https://crates.io/crates/penv)
+* [📄 GitHub](https://github.com/phoenixr-codes/penv/)
+
+
+## License
+
+This work is dual-licensed under Unlicense and MIT.
+You can choose between one of them if you use this work.
+
+`SPDX-License-Identifier: Unlicense OR MIT`
+

src/main.rs

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+use std::env;
+
+use console::style;
+use glob::Pattern;
+
+fn main() {
+    let mut args = env::args();
+    let filter = args.nth(1);
+    if args.count() > 0 {
+        panic!("too many arguments");
+    }
+
+    for (key, value) in env::vars() {
+        if let Some(ref f) = filter {
+            if !Pattern::new(f).expect("invalid glob pattern").matches(&key) {
+                continue;
+            }
+        }
+        println!(
+            "{}\n{}\n",
+            style(key).yellow().bold(),
+            if value.is_empty() {
+                style("(none)").red().italic().to_string()
+            } else {
+                style(value).to_string()
+            }
+        );
+    }
+}