Add a requirements.txt parser

crates/puffin-cli/Cargo.toml

@@ -6,3 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+puffin-requirements = { path = "../puffin-requirements" }
+
+anyhow = "1.0.75"
+clap = { version = "4.4.6", features = ["derive"] }
+colored = { version = "2.0.4" }
+memchr = { version = "2.6.4" }
+pep508_rs = { version = "0.2.3" }

crates/puffin-cli/src/commands/install.rs

@@ -0,0 +1,22 @@
+use std::path::Path;
+use std::str::FromStr;
+
+use anyhow::Result;
+
+use crate::commands::ExitStatus;
+
+pub(crate) fn install(src: &Path) -> Result<ExitStatus> {
+    // Read the `requirements.txt` from disk.
+    let requirements_txt = std::fs::read_to_string(src)?;
+
+    // Parse the `requirements.txt` into a list of requirements.
+    let requirements = puffin_requirements::Requirements::from_str(&requirements_txt)?;
+    for requirement in requirements.iter() {
+        #[allow(clippy::print_stdout)]
+        {
+            println!("{requirement:#?}");
+        }
+    }
+
+    Ok(ExitStatus::Success)
+}

crates/puffin-cli/src/commands/mod.rs

@@ -0,0 +1,30 @@
+use std::process::ExitCode;
+
+pub(crate) use install::install;
+
+mod install;
+
+#[derive(Copy, Clone)]
+pub(crate) enum ExitStatus {
+    /// The command succeeded.
+    #[allow(unused)]
+    Success,
+
+    /// The command failed due to an error in the user input.
+    #[allow(unused)]
+    Failure,
+
+    /// The command failed with an unexpected error.
+    #[allow(unused)]
+    Error,
+}
+
+impl From<ExitStatus> for ExitCode {
+    fn from(status: ExitStatus) -> Self {
+        match status {
+            ExitStatus::Success => ExitCode::from(0),
+            ExitStatus::Failure => ExitCode::from(1),
+            ExitStatus::Error => ExitCode::from(2),
+        }
+    }
+}

crates/puffin-cli/src/main.rs

@@ -1,3 +1,51 @@
-fn main() {
-    println!("Hello, world!");
+use std::path::PathBuf;
+use std::process::ExitCode;
+
+use clap::{Args, Parser, Subcommand};
+use colored::Colorize;
+
+use crate::commands::ExitStatus;
+
+mod commands;
+
+#[derive(Parser)]
+#[command(author, version, about)]
+#[command(propagate_version = true)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Install dependencies from a `requirements.text` file.
+    Install(InstallArgs),
+}
+
+#[derive(Args)]
+struct InstallArgs {
+    /// Path to the `requirements.text` file to install.
+    src: PathBuf,
+}
+
+fn main() -> ExitCode {
+    let cli = Cli::parse();
+
+    let result = match &cli.command {
+        Commands::Install(install) => commands::install(&install.src),
+    };
+
+    match result {
+        Ok(code) => code.into(),
+        Err(err) => {
+            #[allow(clippy::print_stderr)]
+            {
+                eprintln!("{}", "puffin failed".red().bold());
+                for cause in err.chain() {
+                    eprintln!("  {} {cause}", "Cause:".bold());
+                }
+            }
+            ExitStatus::Error.into()
+        }
+    }
 }

crates/puffin-requirements/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "puffin-requirements"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.75"
+clap = { version = "4.4.6", features = ["derive"] }
+colored = { version = "2.0.4" }
+insta = "1.33.0"
+memchr = { version = "2.6.4" }
+pep508_rs = { version = "0.2.3" }
+
+[dev-dependencies]
+criterion = "0.5.1"
+
+[[bench]]
+name = "parser"
+harness = false

crates/puffin-requirements/benches/parser.rs

@@ -0,0 +1,96 @@
+use std::str::FromStr;
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use puffin_requirements::Requirements;
+
+const REQUIREMENTS_TXT: &str = r#"
+#
+# This file is autogenerated by pip-compile with Python 3.7
+# by the following command:
+#
+#    pip-compile --generate-hashes --output-file=requirements.txt --resolver=backtracking pyproject.toml
+#
+attrs==23.1.0 \
+    --hash=sha256:1f28b4522cdc2fb4256ac1a020c78acf9cba2c6b461ccd2c126f3aa8e8335d04 \
+    --hash=sha256:6279836d581513a26f1bf235f9acd333bc9115683f14f7e8fae46c98fc50e015
+    # via
+    #   cattrs
+    #   lsprotocol
+cattrs==23.1.2 \
+    --hash=sha256:b2bb14311ac17bed0d58785e5a60f022e5431aca3932e3fc5cc8ed8639de50a4 \
+    --hash=sha256:db1c821b8c537382b2c7c66678c3790091ca0275ac486c76f3c8f3920e83c657
+    # via lsprotocol
+exceptiongroup==1.1.3 \
+    --hash=sha256:097acd85d473d75af5bb98e41b61ff7fe35efe6675e4f9370ec6ec5126d160e9 \
+    --hash=sha256:343280667a4585d195ca1cf9cef84a4e178c4b6cf2274caef9859782b567d5e3
+    # via cattrs
+importlib-metadata==6.7.0 \
+    --hash=sha256:1aaf550d4f73e5d6783e7acb77aec43d49da8017410afae93822cc9cca98c4d4 \
+    --hash=sha256:cb52082e659e97afc5dac71e79de97d8681de3aa07ff18578330904a9d18e5b5
+    # via
+    #   attrs
+    #   typeguard
+lsprotocol==2023.0.0b1 \
+    --hash=sha256:ade2cd0fa0ede7965698cb59cd05d3adbd19178fd73e83f72ef57a032fbb9d62 \
+    --hash=sha256:f7a2d4655cbd5639f373ddd1789807450c543341fa0a32b064ad30dbb9f510d4
+    # via
+    #   pygls
+    #   ruff-lsp (pyproject.toml)
+packaging==23.2 \
+    --hash=sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5 \
+    --hash=sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7
+    # via ruff-lsp (pyproject.toml)
+pygls==1.1.0 \
+    --hash=sha256:70acb6fe0df1c8a17b7ce08daa0afdb4aedc6913a6a6696003e1434fda80a06e \
+    --hash=sha256:eb19b818039d3d705ec8adbcdf5809a93af925f30cd7a3f3b7573479079ba00e
+    # via ruff-lsp (pyproject.toml)
+ruff==0.0.292 \
+    --hash=sha256:02f29db018c9d474270c704e6c6b13b18ed0ecac82761e4fcf0faa3728430c96 \
+    --hash=sha256:1093449e37dd1e9b813798f6ad70932b57cf614e5c2b5c51005bf67d55db33ac \
+    --hash=sha256:69654e564342f507edfa09ee6897883ca76e331d4bbc3676d8a8403838e9fade \
+    --hash=sha256:6bdfabd4334684a4418b99b3118793f2c13bb67bf1540a769d7816410402a205 \
+    --hash=sha256:6c3c91859a9b845c33778f11902e7b26440d64b9d5110edd4e4fa1726c41e0a4 \
+    --hash=sha256:7f67a69c8f12fbc8daf6ae6d36705037bde315abf8b82b6e1f4c9e74eb750f68 \
+    --hash=sha256:87616771e72820800b8faea82edd858324b29bb99a920d6aa3d3949dd3f88fb0 \
+    --hash=sha256:8e087b24d0d849c5c81516ec740bf4fd48bf363cfb104545464e0fca749b6af9 \
+    --hash=sha256:9889bac18a0c07018aac75ef6c1e6511d8411724d67cb879103b01758e110a81 \
+    --hash=sha256:aa7c77c53bfcd75dbcd4d1f42d6cabf2485d2e1ee0678da850f08e1ab13081a8 \
+    --hash=sha256:ac153eee6dd4444501c4bb92bff866491d4bfb01ce26dd2fff7ca472c8df9ad0 \
+    --hash=sha256:b76deb3bdbea2ef97db286cf953488745dd6424c122d275f05836c53f62d4016 \
+    --hash=sha256:be8eb50eaf8648070b8e58ece8e69c9322d34afe367eec4210fdee9a555e4ca7 \
+    --hash=sha256:e854b05408f7a8033a027e4b1c7f9889563dd2aca545d13d06711e5c39c3d003 \
+    --hash=sha256:f160b5ec26be32362d0774964e218f3fcf0a7da299f7e220ef45ae9e3e67101a \
+    --hash=sha256:f27282bedfd04d4c3492e5c3398360c9d86a295be00eccc63914438b4ac8a83c \
+    --hash=sha256:f4476f1243af2d8c29da5f235c13dca52177117935e1f9393f9d90f9833f69e4
+    # via ruff-lsp (pyproject.toml)
+typeguard==3.0.2 \
+    --hash=sha256:bbe993854385284ab42fd5bd3bee6f6556577ce8b50696d6cb956d704f286c8e \
+    --hash=sha256:fee5297fdb28f8e9efcb8142b5ee219e02375509cd77ea9d270b5af826358d5a
+    # via pygls
+typing-extensions==4.7.1 \
+    --hash=sha256:440d5dd3af93b060174bf433bccd69b0babc3b15b1a8dca43789fd7f61514b36 \
+    --hash=sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2
+    # via
+    #   cattrs
+    #   importlib-metadata
+    #   ruff-lsp (pyproject.toml)
+    #   typeguard
+zipp==3.15.0 \
+    --hash=sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b \
+    --hash=sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556
+    # via importlib-metadata
+"#;
+
+fn bench_fibs(c: &mut Criterion) {
+    let mut group = c.benchmark_group("Parser");
+
+    group.bench_function("Parse", |b| {
+        b.iter(|| Requirements::from_str(black_box(REQUIREMENTS_TXT)).unwrap());
+    });
+
+    group.finish();
+}
+
+criterion_group!(benches, bench_fibs);
+criterion_main!(benches);

crates/puffin-requirements/src/lib.rs

@@ -0,0 +1,291 @@
+use std::borrow::Cow;
+use std::ops::Deref;
+use std::str::FromStr;
+
+use anyhow::Result;
+use memchr::{memchr2, memchr_iter};
+use pep508_rs::{Pep508Error, Requirement};
+
+#[derive(Debug)]
+pub struct Requirements(Vec<Requirement>);
+
+impl FromStr for Requirements {
+    type Err = Pep508Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(Self(
+            RequirementsIterator::new(s)
+                .map(|requirement| Requirement::from_str(requirement.as_str()))
+                .collect::<Result<Vec<Requirement>, Pep508Error>>()?,
+        ))
+    }
+}
+
+impl Deref for Requirements {
+    type Target = [Requirement];
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+#[derive(Debug)]
+struct RequirementsIterator<'a> {
+    text: &'a str,
+    index: usize,
+}
+
+impl<'a> RequirementsIterator<'a> {
+    fn new(text: &'a str) -> Self {
+        Self { text, index: 0 }
+    }
+}
+
+#[derive(Debug)]
+struct RequirementLine<'a> {
+    /// The line as included in the `requirements.txt`, including comments and `--hash` extras.
+    line: Cow<'a, str>,
+    /// The line, with comments and `--hash` extras stripped.
+    len: usize,
+}
+
+impl<'a> RequirementLine<'a> {
+    /// Create a new `RequirementLine` from a line of text.
+    fn from_line(line: Cow<'a, str>) -> Self {
+        Self {
+            len: Self::strip_trivia(&line),
+            line,
+        }
+    }
+
+    /// Return a parseable requirement line.
+    fn as_str(&self) -> &str {
+        &self.line[..self.len]
+    }
+
+    /// Strip trivia (comments and `--hash` extras) from a requirement, returning the length of the
+    /// requirement itself.
+    fn strip_trivia(requirement: &str) -> usize {
+        let mut len = requirement.len();
+
+        // Strip comments.
+        for position in memchr_iter(b'#', requirement[..len].as_bytes()) {
+            // The comment _must_ be preceded by whitespace.
+            if requirement[..len + position]
+                .chars()
+                .rev()
+                .next()
+                .is_some_and(char::is_whitespace)
+            {
+                len = position;
+                break;
+            }
+        }
+
+        // Strip `--hash` extras.
+        if let Some(index) = requirement[..len].find("--hash") {
+            len = index;
+        }
+
+        len
+    }
+}
+
+impl<'a> Iterator for RequirementsIterator<'a> {
+    type Item = RequirementLine<'a>;
+
+    #[inline]
+    fn next(&mut self) -> Option<RequirementLine<'a>> {
+        if self.index == self.text.len() - 1 {
+            return None;
+        }
+
+        // Find the next line break.
+        let Some((start, length)) = find_newline(&self.text[self.index..]) else {
+            // Parse the rest of the text.
+            let line = &self.text[self.index..];
+            self.index = self.text.len() - 1;
+
+            // Skip fully-commented lines.
+            if line.trim_start().starts_with('#') {
+                return None;
+            }
+
+            // Skip empty lines.
+            if line.trim().is_empty() {
+                return None;
+            }
+
+            return Some(RequirementLine::from_line(Cow::Borrowed(line)));
+        };
+
+        // Skip fully-commented lines.
+        if self.text[self.index..].trim_start().starts_with('#') {
+            self.index += start + length;
+            return self.next();
+        }
+
+        // Skip empty lines.
+        if self.text[self.index..self.index + start].trim().is_empty() {
+            self.index += start + length;
+            return self.next();
+        }
+
+        // If the newline is preceded by a continuation (\\), keep going.
+        if self.text[..self.index + start]
+            .chars()
+            .rev()
+            .next()
+            .is_some_and(|c| c == '\\')
+        {
+            // Add the line contents, preceding the continuation.
+            let mut line = self.text[self.index..self.index + start - 1].to_owned();
+            self.index += start + length;
+
+            // Eat lines until we see a non-continuation.
+            while let Some((start, length)) = find_newline(&self.text[self.index..]) {
+                if self.text[..self.index + start]
+                    .chars()
+                    .rev()
+                    .next()
+                    .is_some_and(|c| c == '\\')
+                {
+                    // Add the line contents, preceding the continuation.
+                    line.push_str(&self.text[self.index..self.index + start - 1]);
+                    self.index += start + length;
+                } else {
+                    // Add the line contents, excluding the continuation.
+                    line.push_str(&self.text[self.index..self.index + start]);
+                    self.index += start + length;
+                    break;
+                }
+            }
+
+            Some(RequirementLine::from_line(Cow::Owned(line)))
+        } else {
+            let line = &self.text[self.index..self.index + start];
+            self.index += start + length;
+            Some(RequirementLine::from_line(Cow::Borrowed(line)))
+        }
+    }
+}
+
+/// Return the start and end position of the first newline character in the given text.
+#[inline]
+fn find_newline(text: &str) -> Option<(usize, usize)> {
+    let bytes = text.as_bytes();
+    let position = memchr2(b'\n', b'\r', bytes)?;
+
+    // SAFETY: memchr guarantees to return valid positions
+    #[allow(unsafe_code)]
+    let newline_character = unsafe { *bytes.get_unchecked(position) };
+
+    Some(match newline_character {
+        // Explicit branch for `\n` as this is the most likely path
+        b'\n' => (position, 1),
+        // '\r\n'
+        b'\r' if bytes.get(position.saturating_add(1)) == Some(&b'\n') => (position, 2),
+        // '\r'
+        _ => (position, 1),
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr;
+
+    use insta::assert_debug_snapshot;
+
+    use crate::Requirements;
+    use anyhow::Result;
+
+    #[test]
+    fn simple() -> Result<()> {
+        assert_debug_snapshot!(Requirements::from_str(r#"flask==2.0"#)?);
+        Ok(())
+    }
+
+    #[test]
+    fn pip_compile() -> Result<()> {
+        assert_debug_snapshot!(Requirements::from_str(
+            r#"
+#
+# This file is autogenerated by pip-compile with Python 3.7
+# by the following command:
+#
+#    pip-compile --generate-hashes --output-file=requirements.txt --resolver=backtracking pyproject.toml
+#
+attrs==23.1.0 \
+    --hash=sha256:1f28b4522cdc2fb4256ac1a020c78acf9cba2c6b461ccd2c126f3aa8e8335d04 \
+    --hash=sha256:6279836d581513a26f1bf235f9acd333bc9115683f14f7e8fae46c98fc50e015
+    # via
+    #   cattrs
+    #   lsprotocol
+cattrs==23.1.2 \
+    --hash=sha256:b2bb14311ac17bed0d58785e5a60f022e5431aca3932e3fc5cc8ed8639de50a4 \
+    --hash=sha256:db1c821b8c537382b2c7c66678c3790091ca0275ac486c76f3c8f3920e83c657
+    # via lsprotocol
+exceptiongroup==1.1.3 \
+    --hash=sha256:097acd85d473d75af5bb98e41b61ff7fe35efe6675e4f9370ec6ec5126d160e9 \
+    --hash=sha256:343280667a4585d195ca1cf9cef84a4e178c4b6cf2274caef9859782b567d5e3
+    # via cattrs
+importlib-metadata==6.7.0 \
+    --hash=sha256:1aaf550d4f73e5d6783e7acb77aec43d49da8017410afae93822cc9cca98c4d4 \
+    --hash=sha256:cb52082e659e97afc5dac71e79de97d8681de3aa07ff18578330904a9d18e5b5
+    # via
+    #   attrs
+    #   typeguard
+lsprotocol==2023.0.0b1 \
+    --hash=sha256:ade2cd0fa0ede7965698cb59cd05d3adbd19178fd73e83f72ef57a032fbb9d62 \
+    --hash=sha256:f7a2d4655cbd5639f373ddd1789807450c543341fa0a32b064ad30dbb9f510d4
+    # via
+    #   pygls
+    #   ruff-lsp (pyproject.toml)
+packaging==23.2 \
+    --hash=sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5 \
+    --hash=sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7
+    # via ruff-lsp (pyproject.toml)
+pygls==1.1.0 \
+    --hash=sha256:70acb6fe0df1c8a17b7ce08daa0afdb4aedc6913a6a6696003e1434fda80a06e \
+    --hash=sha256:eb19b818039d3d705ec8adbcdf5809a93af925f30cd7a3f3b7573479079ba00e
+    # via ruff-lsp (pyproject.toml)
+ruff==0.0.292 \
+    --hash=sha256:02f29db018c9d474270c704e6c6b13b18ed0ecac82761e4fcf0faa3728430c96 \
+    --hash=sha256:1093449e37dd1e9b813798f6ad70932b57cf614e5c2b5c51005bf67d55db33ac \
+    --hash=sha256:69654e564342f507edfa09ee6897883ca76e331d4bbc3676d8a8403838e9fade \
+    --hash=sha256:6bdfabd4334684a4418b99b3118793f2c13bb67bf1540a769d7816410402a205 \
+    --hash=sha256:6c3c91859a9b845c33778f11902e7b26440d64b9d5110edd4e4fa1726c41e0a4 \
+    --hash=sha256:7f67a69c8f12fbc8daf6ae6d36705037bde315abf8b82b6e1f4c9e74eb750f68 \
+    --hash=sha256:87616771e72820800b8faea82edd858324b29bb99a920d6aa3d3949dd3f88fb0 \
+    --hash=sha256:8e087b24d0d849c5c81516ec740bf4fd48bf363cfb104545464e0fca749b6af9 \
+    --hash=sha256:9889bac18a0c07018aac75ef6c1e6511d8411724d67cb879103b01758e110a81 \
+    --hash=sha256:aa7c77c53bfcd75dbcd4d1f42d6cabf2485d2e1ee0678da850f08e1ab13081a8 \
+    --hash=sha256:ac153eee6dd4444501c4bb92bff866491d4bfb01ce26dd2fff7ca472c8df9ad0 \
+    --hash=sha256:b76deb3bdbea2ef97db286cf953488745dd6424c122d275f05836c53f62d4016 \
+    --hash=sha256:be8eb50eaf8648070b8e58ece8e69c9322d34afe367eec4210fdee9a555e4ca7 \
+    --hash=sha256:e854b05408f7a8033a027e4b1c7f9889563dd2aca545d13d06711e5c39c3d003 \
+    --hash=sha256:f160b5ec26be32362d0774964e218f3fcf0a7da299f7e220ef45ae9e3e67101a \
+    --hash=sha256:f27282bedfd04d4c3492e5c3398360c9d86a295be00eccc63914438b4ac8a83c \
+    --hash=sha256:f4476f1243af2d8c29da5f235c13dca52177117935e1f9393f9d90f9833f69e4
+    # via ruff-lsp (pyproject.toml)
+typeguard==3.0.2 \
+    --hash=sha256:bbe993854385284ab42fd5bd3bee6f6556577ce8b50696d6cb956d704f286c8e \
+    --hash=sha256:fee5297fdb28f8e9efcb8142b5ee219e02375509cd77ea9d270b5af826358d5a
+    # via pygls
+typing-extensions==4.7.1 \
+    --hash=sha256:440d5dd3af93b060174bf433bccd69b0babc3b15b1a8dca43789fd7f61514b36 \
+    --hash=sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2
+    # via
+    #   cattrs
+    #   importlib-metadata
+    #   ruff-lsp (pyproject.toml)
+    #   typeguard
+zipp==3.15.0 \
+    --hash=sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b \
+    --hash=sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556
+    # via importlib-metadata
+"#
+        )?);
+        Ok(())
+    }
+}

crates/puffin-requirements/src/snapshots/puffin_requirements__tests__pip_compile.snap

@@ -0,0 +1,320 @@
+---
+source: crates/puffin-requirements/src/lib.rs
+expression: "Requirements::from_str(r#\"\n#\n# This file is autogenerated by pip-compile with Python 3.7\n# by the following command:\n#\n#    pip-compile --generate-hashes --output-file=requirements.txt --resolver=backtracking pyproject.toml\n#\nattrs==23.1.0 \\\n    --hash=sha256:1f28b4522cdc2fb4256ac1a020c78acf9cba2c6b461ccd2c126f3aa8e8335d04 \\\n    --hash=sha256:6279836d581513a26f1bf235f9acd333bc9115683f14f7e8fae46c98fc50e015\n    # via\n    #   cattrs\n    #   lsprotocol\ncattrs==23.1.2 \\\n    --hash=sha256:b2bb14311ac17bed0d58785e5a60f022e5431aca3932e3fc5cc8ed8639de50a4 \\\n    --hash=sha256:db1c821b8c537382b2c7c66678c3790091ca0275ac486c76f3c8f3920e83c657\n    # via lsprotocol\nexceptiongroup==1.1.3 \\\n    --hash=sha256:097acd85d473d75af5bb98e41b61ff7fe35efe6675e4f9370ec6ec5126d160e9 \\\n    --hash=sha256:343280667a4585d195ca1cf9cef84a4e178c4b6cf2274caef9859782b567d5e3\n    # via cattrs\nimportlib-metadata==6.7.0 \\\n    --hash=sha256:1aaf550d4f73e5d6783e7acb77aec43d49da8017410afae93822cc9cca98c4d4 \\\n    --hash=sha256:cb52082e659e97afc5dac71e79de97d8681de3aa07ff18578330904a9d18e5b5\n    # via\n    #   attrs\n    #   typeguard\nlsprotocol==2023.0.0b1 \\\n    --hash=sha256:ade2cd0fa0ede7965698cb59cd05d3adbd19178fd73e83f72ef57a032fbb9d62 \\\n    --hash=sha256:f7a2d4655cbd5639f373ddd1789807450c543341fa0a32b064ad30dbb9f510d4\n    # via\n    #   pygls\n    #   ruff-lsp (pyproject.toml)\npackaging==23.2 \\\n    --hash=sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5 \\\n    --hash=sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7\n    # via ruff-lsp (pyproject.toml)\npygls==1.1.0 \\\n    --hash=sha256:70acb6fe0df1c8a17b7ce08daa0afdb4aedc6913a6a6696003e1434fda80a06e \\\n    --hash=sha256:eb19b818039d3d705ec8adbcdf5809a93af925f30cd7a3f3b7573479079ba00e\n    # via ruff-lsp (pyproject.toml)\nruff==0.0.292 \\\n    --hash=sha256:02f29db018c9d474270c704e6c6b13b18ed0ecac82761e4fcf0faa3728430c96 \\\n    --hash=sha256:1093449e37dd1e9b813798f6ad70932b57cf614e5c2b5c51005bf67d55db33ac \\\n    --hash=sha256:69654e564342f507edfa09ee6897883ca76e331d4bbc3676d8a8403838e9fade \\\n    --hash=sha256:6bdfabd4334684a4418b99b3118793f2c13bb67bf1540a769d7816410402a205 \\\n    --hash=sha256:6c3c91859a9b845c33778f11902e7b26440d64b9d5110edd4e4fa1726c41e0a4 \\\n    --hash=sha256:7f67a69c8f12fbc8daf6ae6d36705037bde315abf8b82b6e1f4c9e74eb750f68 \\\n    --hash=sha256:87616771e72820800b8faea82edd858324b29bb99a920d6aa3d3949dd3f88fb0 \\\n    --hash=sha256:8e087b24d0d849c5c81516ec740bf4fd48bf363cfb104545464e0fca749b6af9 \\\n    --hash=sha256:9889bac18a0c07018aac75ef6c1e6511d8411724d67cb879103b01758e110a81 \\\n    --hash=sha256:aa7c77c53bfcd75dbcd4d1f42d6cabf2485d2e1ee0678da850f08e1ab13081a8 \\\n    --hash=sha256:ac153eee6dd4444501c4bb92bff866491d4bfb01ce26dd2fff7ca472c8df9ad0 \\\n    --hash=sha256:b76deb3bdbea2ef97db286cf953488745dd6424c122d275f05836c53f62d4016 \\\n    --hash=sha256:be8eb50eaf8648070b8e58ece8e69c9322d34afe367eec4210fdee9a555e4ca7 \\\n    --hash=sha256:e854b05408f7a8033a027e4b1c7f9889563dd2aca545d13d06711e5c39c3d003 \\\n    --hash=sha256:f160b5ec26be32362d0774964e218f3fcf0a7da299f7e220ef45ae9e3e67101a \\\n    --hash=sha256:f27282bedfd04d4c3492e5c3398360c9d86a295be00eccc63914438b4ac8a83c \\\n    --hash=sha256:f4476f1243af2d8c29da5f235c13dca52177117935e1f9393f9d90f9833f69e4\n    # via ruff-lsp (pyproject.toml)\ntypeguard==3.0.2 \\\n    --hash=sha256:bbe993854385284ab42fd5bd3bee6f6556577ce8b50696d6cb956d704f286c8e \\\n    --hash=sha256:fee5297fdb28f8e9efcb8142b5ee219e02375509cd77ea9d270b5af826358d5a\n    # via pygls\ntyping-extensions==4.7.1 \\\n    --hash=sha256:440d5dd3af93b060174bf433bccd69b0babc3b15b1a8dca43789fd7f61514b36 \\\n    --hash=sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2\n    # via\n    #   cattrs\n    #   importlib-metadata\n    #   ruff-lsp (pyproject.toml)\n    #   typeguard\nzipp==3.15.0 \\\n    --hash=sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b \\\n    --hash=sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556\n    # via importlib-metadata\n\"#)?"
+---
+Requirements(
+    [
+        Requirement {
+            name: "attrs",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        23,
+                                        1,
+                                        0,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "cattrs",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        23,
+                                        1,
+                                        2,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "exceptiongroup",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        1,
+                                        1,
+                                        3,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "importlib-metadata",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        6,
+                                        7,
+                                        0,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "lsprotocol",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        2023,
+                                        0,
+                                        0,
+                                    ],
+                                    pre: Some(
+                                        (
+                                            Beta,
+                                            1,
+                                        ),
+                                    ),
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "packaging",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        23,
+                                        2,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "pygls",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        1,
+                                        1,
+                                        0,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "ruff",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        0,
+                                        0,
+                                        292,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "typeguard",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        3,
+                                        0,
+                                        2,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "typing-extensions",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        4,
+                                        7,
+                                        1,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+        Requirement {
+            name: "zipp",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        3,
+                                        15,
+                                        0,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+    ],
+)

crates/puffin-requirements/src/snapshots/puffin_requirements__tests__simple.snap

@@ -0,0 +1,35 @@
+---
+source: crates/puffin-requirements/src/lib.rs
+expression: "Requirements::from_str(r#\"flask==2.0\"#)?"
+---
+Requirements(
+    [
+        Requirement {
+            name: "flask",
+            extras: None,
+            version_or_url: Some(
+                VersionSpecifier(
+                    VersionSpecifiers(
+                        [
+                            VersionSpecifier {
+                                operator: Equal,
+                                version: Version {
+                                    epoch: 0,
+                                    release: [
+                                        2,
+                                        0,
+                                    ],
+                                    pre: None,
+                                    post: None,
+                                    dev: None,
+                                    local: None,
+                                },
+                            },
+                        ],
+                    ),
+                ),
+            ),
+            marker: None,
+        },
+    ],
+)