+1

.envrc

··· 1 1 + use flake

+1

.gitignore

··· 1 1 + result

+440

Cargo.lock

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+21

Cargo.toml

··· 1 1 + [package] 2 2 + name = "lix-diff" 3 3 + version = "0.0.1" 4 4 + license = "MIT" 5 5 + description = "A lix plugin for diffing two generations" 6 6 + homepage = "https://github.com/isabelroses/lix-diff" 7 7 + authors = [] 8 8 + edition = "2024" 9 9 + 10 10 + [dependencies] 11 11 + argh = "0.1.13" 12 12 + color-eyre = "0.6.4" 13 13 + humansize = "2.1.3" 14 14 + nu-ansi-term = "0.50.1" 15 15 + serde = "1.0.219" 16 16 + serde_json = "1.0.140" 17 17 + 18 18 + [lints.clippy] 19 19 + all = "warn" 20 20 + pedantic = "warn" 21 21 + unreadable_literal = { level = "allow", priority = 1 }

+27

flake.lock

··· 1 1 + { 2 2 + "nodes": { 3 3 + "nixpkgs": { 4 4 + "locked": { 5 5 + "lastModified": 1746576598, 6 6 + "narHash": "sha256-FshoQvr6Aor5SnORVvh/ZdJ1Sa2U4ZrIMwKBX5k2wu0=", 7 7 + "owner": "nixos", 8 8 + "repo": "nixpkgs", 9 9 + "rev": "b3582c75c7f21ce0b429898980eddbbf05c68e55", 10 10 + "type": "github" 11 11 + }, 12 12 + "original": { 13 13 + "owner": "nixos", 14 14 + "ref": "nixpkgs-unstable", 15 15 + "repo": "nixpkgs", 16 16 + "type": "github" 17 17 + } 18 18 + }, 19 19 + "root": { 20 20 + "inputs": { 21 21 + "nixpkgs": "nixpkgs" 22 22 + } 23 23 + } 24 24 + }, 25 25 + "root": "root", 26 26 + "version": 7 27 27 + }

+25

flake.nix

··· 1 1 + { 2 2 + inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable"; 3 3 + 4 4 + outputs = 5 5 + { self, nixpkgs }: 6 6 + let 7 7 + forAllSystems = 8 8 + function: 9 9 + nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed ( 10 10 + system: function nixpkgs.legacyPackages.${system} 11 11 + ); 12 12 + in 13 13 + { 14 14 + packages = forAllSystems (pkgs: { 15 15 + lix-diff = pkgs.callPackage ./package.nix { }; 16 16 + default = self.packages.${pkgs.stdenv.hostPlatform.system}.lix-diff; 17 17 + }); 18 18 + 19 19 + devShells = forAllSystems (pkgs: { 20 20 + default = pkgs.callPackage ./shell.nix { }; 21 21 + }); 22 22 + 23 23 + overlays.default = final: _: { lix-diff = final.callPackage ./package.nix { }; }; 24 24 + }; 25 25 + }

+28

package.nix

··· 1 1 + { lib, rustPlatform }: 2 2 + let 3 3 + toml = (lib.importTOML ./Cargo.toml).package; 4 4 + in 5 5 + rustPlatform.buildRustPackage { 6 6 + pname = "lix-diff"; 7 7 + inherit (toml) version; 8 8 + 9 9 + src = lib.fileset.toSource { 10 10 + root = ./.; 11 11 + fileset = lib.fileset.intersection (lib.fileset.fromSource (lib.sources.cleanSource ./.)) ( 12 12 + lib.fileset.unions [ 13 13 + ./Cargo.toml 14 14 + ./Cargo.lock 15 15 + ./src 16 16 + ] 17 17 + ); 18 18 + }; 19 19 + 20 20 + cargoLock.lockFile = ./Cargo.lock; 21 21 + 22 22 + meta = { 23 23 + inherit (toml) homepage description; 24 24 + license = lib.licenses.mit; 25 25 + maintainers = with lib.maintainers; [ isabelroses ]; 26 26 + mainProgram = "nvd"; 27 27 + }; 28 28 + }

+26

shell.nix

··· 1 1 + { 2 2 + mkShell, 3 3 + callPackage, 4 4 + rustPlatform, 5 5 + 6 6 + # extra tooling 7 7 + clippy, 8 8 + rustfmt, 9 9 + rust-analyzer, 10 10 + }: 11 11 + let 12 12 + defaultPackage = callPackage ./package.nix { }; 13 13 + in 14 14 + mkShell { 15 15 + inputsFrom = [ defaultPackage ]; 16 16 + 17 17 + env = { 18 18 + RUST_SRC_PATH = rustPlatform.rustLibSrc; 19 19 + }; 20 20 + 21 21 + packages = [ 22 22 + clippy 23 23 + rustfmt 24 24 + rust-analyzer 25 25 + ]; 26 26 + }

+92

src/diff.rs

··· 1 1 + use humansize::{format_size, DECIMAL}; 2 2 + use nu_ansi_term::Color::{self, Green, Red, Yellow}; 3 3 + use std::collections::BTreeMap; 4 4 + 5 5 + use crate::package::{DiffType, Package}; 6 6 + use crate::parser::DiffRoot; 7 7 + 8 8 + #[derive(Debug)] 9 9 + pub struct PackageListDiff { 10 10 + pub added: BTreeMap<String, Package>, 11 11 + pub removed: BTreeMap<String, Package>, 12 12 + pub changed: BTreeMap<String, Package>, 13 13 + size_delta: i64, 14 14 + longest_name: usize, 15 15 + } 16 16 + 17 17 + pub fn partition_diff(diff: &DiffRoot) -> PackageListDiff { 18 18 + let mut added = BTreeMap::new(); 19 19 + let mut removed = BTreeMap::new(); 20 20 + let mut changed = BTreeMap::new(); 21 21 + let mut size_delta: i64 = 0; 22 22 + let mut longest_name = 0; 23 23 + 24 24 + for (name, package) in &diff.packages { 25 25 + match package.diff_type { 26 26 + DiffType::Added => { 27 27 + added.insert(name.clone(), package.clone()); 28 28 + } 29 29 + DiffType::Removed => { 30 30 + removed.insert(name.clone(), package.clone()); 31 31 + } 32 32 + DiffType::Changed => { 33 33 + changed.insert(name.clone(), package.clone()); 34 34 + } 35 35 + _ => {} 36 36 + } 37 37 + 38 38 + size_delta += package.size_delta; 39 39 + longest_name = longest_name.max(name.len()); 40 40 + } 41 41 + 42 42 + PackageListDiff { 43 43 + added, 44 44 + removed, 45 45 + changed, 46 46 + size_delta, 47 47 + longest_name, 48 48 + } 49 49 + } 50 50 + 51 51 + impl std::fmt::Display for PackageListDiff { 52 52 + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { 53 53 + if self.added.is_empty() && self.removed.is_empty() && self.changed.is_empty() { 54 54 + return write!(f, "No differences found."); 55 55 + } 56 56 + 57 57 + let title_style = nu_ansi_term::Style::new() 58 58 + .underline() 59 59 + .bold() 60 60 + .fg(Color::LightGray); 61 61 + 62 62 + let name_width = self.longest_name + 2; 63 63 + 64 64 + writeln!(f, "{}", &title_style.paint("Changed"))?; 65 65 + for (name, package) in &self.changed { 66 66 + writeln!(f, "[{}] {name:name_width$}{package}", Yellow.paint("C"))?; 67 67 + } 68 68 + 69 69 + writeln!(f)?; 70 70 + writeln!(f, "{}", &title_style.paint("Added"))?; 71 71 + for (name, package) in &self.added { 72 72 + write!(f, "[{}] {name:name_width$}{package}", Green.paint("A"))?; 73 73 + writeln!(f)?; 74 74 + } 75 75 + 76 76 + writeln!(f)?; 77 77 + writeln!(f, "{}", &title_style.paint("Removed"))?; 78 78 + for (name, package) in &self.removed { 79 79 + writeln!(f, "[{}] {name:name_width$}{package}", Red.paint("R"))?; 80 80 + } 81 81 + 82 82 + { 83 83 + let delta = self.size_delta; 84 84 + let sign = if delta > 0 { "+" } else { "-" }; 85 85 + let size: u64 = delta.abs().try_into().unwrap_or(0); 86 86 + writeln!(f)?; 87 87 + writeln!(f, "size diff: {sign}{}", format_size(size, DECIMAL))?; 88 88 + } 89 89 + 90 90 + Ok(()) 91 91 + } 92 92 + }

+46

src/main.rs

··· 1 1 + use argh::FromArgs; 2 2 + use color_eyre::Result; 3 3 + use nu_ansi_term::{Color, Style}; 4 4 + 5 5 + mod diff; 6 6 + mod package; 7 7 + mod parser; 8 8 + 9 9 + #[derive(FromArgs, PartialEq, Debug)] 10 10 + /// List the package differences between two `NixOS` generations 11 11 + struct Args { 12 12 + /// the generation we are switching from 13 13 + #[argh(positional)] 14 14 + before: String, 15 15 + 16 16 + /// the generation we are switching to 17 17 + #[argh(positional)] 18 18 + after: String, 19 19 + } 20 20 + 21 21 + fn main() -> Result<()> { 22 22 + let args: Args = argh::from_env(); 23 23 + let before = args.before; 24 24 + let after = args.after; 25 25 + 26 26 + // Check if the generations are valid 27 27 + if before.is_empty() || after.is_empty() { 28 28 + eprintln!("Both generations must be specified."); 29 29 + std::process::exit(1); 30 30 + } 31 31 + 32 32 + let diff = parser::diff(&before, &after)?; 33 33 + let packages = diff::partition_diff(&diff); 34 34 + 35 35 + let arrow_style = Style::new().bold().fg(Color::LightGray); 36 36 + 37 37 + let before_text = format!("<<< {before}"); 38 38 + let after_text = format!(">>> {after}"); 39 39 + 40 40 + println!("{}", arrow_style.paint(before_text)); 41 41 + println!("{}\n", arrow_style.paint(after_text)); 42 42 + 43 43 + println!("{packages}"); 44 44 + 45 45 + Ok(()) 46 46 + }

+82

src/package.rs

··· 1 1 + use nu_ansi_term::Color::{Green, Red}; 2 2 + use serde::de::Deserializer; 3 3 + use serde::Deserialize; 4 4 + 5 5 + #[derive(Default, Debug, Clone, Copy, PartialEq, Eq)] 6 6 + pub enum DiffType { 7 7 + Added, 8 8 + Removed, 9 9 + Changed, 10 10 + 11 11 + #[default] 12 12 + Unknown, 13 13 + } 14 14 + 15 15 + #[derive(Deserialize, Clone, Debug)] 16 16 + #[serde(rename_all = "camelCase")] 17 17 + pub struct Package { 18 18 + pub size_delta: i64, 19 19 + 20 20 + #[serde(deserialize_with = "version_deserializer")] 21 21 + pub versions_before: Vec<String>, 22 22 + 23 23 + #[serde(deserialize_with = "version_deserializer")] 24 24 + pub versions_after: Vec<String>, 25 25 + 26 26 + /// This is not a part of the JSON schema, but is used to determine the type of diff 27 27 + #[serde(skip)] 28 28 + pub diff_type: DiffType, 29 29 + } 30 30 + 31 31 + fn version_deserializer<'de, D>(deserializer: D) -> Result<Vec<String>, D::Error> 32 32 + where 33 33 + D: Deserializer<'de>, 34 34 + { 35 35 + let vec = Vec::<String>::deserialize(deserializer)?; 36 36 + Ok(vec 37 37 + .into_iter() 38 38 + .map(|s| { 39 39 + if s.is_empty() { 40 40 + "<none>".to_string() 41 41 + } else { 42 42 + s 43 43 + } 44 44 + }) 45 45 + .collect()) 46 46 + } 47 47 + 48 48 + impl DiffType { 49 49 + pub fn from_versions(before: &[String], after: &[String]) -> DiffType { 50 50 + match (before.is_empty(), after.is_empty()) { 51 51 + (true, false) => DiffType::Added, 52 52 + (false, true) => DiffType::Removed, 53 53 + (false, false) => DiffType::Changed, 54 54 + (true, true) => DiffType::Unknown, // should be unreachable but im not sure 55 55 + } 56 56 + } 57 57 + } 58 58 + 59 59 + impl std::fmt::Display for Package { 60 60 + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { 61 61 + // added package 62 62 + match self.diff_type { 63 63 + DiffType::Added => { 64 64 + write!(f, "{}", Green.paint(self.versions_after.join(", ")))?; 65 65 + } 66 66 + DiffType::Removed => { 67 67 + write!(f, "{}", Red.paint(self.versions_before.join(", ")))?; 68 68 + } 69 69 + DiffType::Changed => { 70 70 + write!( 71 71 + f, 72 72 + "{} -> {}", 73 73 + Red.paint(self.versions_before.join(", ")), 74 74 + Green.paint(self.versions_after.join(", ")) 75 75 + )?; 76 76 + } 77 77 + DiffType::Unknown => unreachable!(), 78 78 + } 79 79 + 80 80 + Ok(()) 81 81 + } 82 82 + }

+55

src/parser.rs

··· 1 1 + use color_eyre::Result; 2 2 + use serde::Deserialize; 3 3 + use std::{collections::BTreeMap, process::Command}; 4 4 + 5 5 + use crate::package::{DiffType, Package}; 6 6 + 7 7 + #[derive(Deserialize, Debug)] 8 8 + pub struct DiffRoot { 9 9 + pub packages: BTreeMap<String, Package>, 10 10 + 11 11 + #[expect(dead_code)] 12 12 + pub schema: String, 13 13 + } 14 14 + 15 15 + fn run_diff(before: &str, after: &str) -> String { 16 16 + let raw_diff = Command::new("nix") 17 17 + .args(["store", "diff-closures", "--json", before, after]) 18 18 + .output() 19 19 + .expect("Failed to execute command"); 20 20 + 21 21 + if !raw_diff.status.success() { 22 22 + eprintln!("Error: {}", String::from_utf8_lossy(&raw_diff.stderr)); 23 23 + std::process::exit(1); 24 24 + } 25 25 + 26 26 + let diff_output = String::from_utf8_lossy(&raw_diff.stdout); 27 27 + if diff_output.is_empty() { 28 28 + eprintln!("No differences found."); 29 29 + std::process::exit(0); 30 30 + } 31 31 + 32 32 + diff_output.into_owned() 33 33 + } 34 34 + 35 35 + fn parse_diff(input: &str) -> Result<DiffRoot> { 36 36 + serde_json::from_str(input) 37 37 + .map(|mut diff_root: DiffRoot| { 38 38 + for package in diff_root.packages.values_mut() { 39 39 + package.diff_type = 40 40 + DiffType::from_versions(&package.versions_before, &package.versions_after); 41 41 + } 42 42 + diff_root 43 43 + }) 44 44 + .map_err(|e| { 45 45 + eprintln!("Failed to parse JSON: {e}"); 46 46 + std::process::exit(1); 47 47 + }) 48 48 + } 49 49 + 50 50 + pub fn diff(before: &str, after: &str) -> Result<DiffRoot> { 51 51 + let diff_output = run_diff(before, after); 52 52 + let diff_root: DiffRoot = parse_diff(&diff_output)?; 53 53 + 54 54 + Ok(diff_root) 55 55 + }