# abdurehmanimran/pacx architecture

> Architecture diagram of the GitHub repository abdurehmanimran/pacx, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-06-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/abdurehmanimran/pacx
- Repository: https://github.com/abdurehmanimran/pacx

## Overview

1. **What Pacx is**
   - Pacx is a **single native C command-line application** for Arch Linux that sits around **pacman** and speeds up package retrieval with **aria2c**.  
   - Architecturally, it is a **local orchestration tool**, not a daemon or network service.

2. **Top-level control flow**
   - The main executable lives in **`src/pacx.c` / `src/pacx.h`**.
   - This module is the **entry point and coordinator**: it interprets user intent, prepares package operations, connects the supporting subsystems, and triggers the download/output workflow.

3. **Package selection and grouping**
   - **`src/packagelist.c` / `src/packagelist.h`** likely manages the set of packages Pacx is asked to act on.
   - This is the boundary where command-line package names or pacman-generated package targets become an internal list for further processing.

4. **Package metadata handling**
   - **`src/packageinfo.c` / `src/packageinfo.h`** encapsulates information about each package.
   - This layer is responsible for the package-level data Pacx needs to build downloads and present meaningful output, such as package names, versions, or repository-related metadata.

5. **URL generation / mirror resolution**
   - **`src/urls.c` / `src/urls.h`** turns package metadata into concrete download URLs.
   - This is a key architectural boundary: it bridges **package identity** to **retrievable artifacts** on Arch mirrors or package sources.

6. **Download engine**
   - **`src/downloader.c` / `src/downloader.h`** handles the actual fetching of package files.
   - Pacx’s core speedup comes from this subsystem, which likely coordinates **aria2c** and parallel downloads rather than downloading packages one-by-one through pacman.

7. **Progress and terminal feedback**
   - **`src/progress.c` / `src/progress.h`** tracks and displays download progress.
   - **`src/print.c` / `src/print.h`** handles user-facing messages, status lines, and formatted output.
   - **`src/colors.h`** provides terminal color styling, reinforcing the “Nala-like” interactive CLI presentation.

8. **Shared utility layer**
   - **`src/str.c` / `src/str.h`** is a common string utility layer used across the project.
   - This keeps string parsing, formatting, and manipulation out of the higher-level modules, reducing duplication.

9. **External dependencies and boundaries**
   - Pacx depends on the **Arch Linux pacman ecosystem** and uses **aria2c** for fast, parallel package downloads.
   - The important architectural boundary is that Pacx **does not replace pacman’s package management model**; it augments the download path and user experience around it.

10. **Build and packaging**
   - The repo is a straightforward C project built with the **Makefile** at the root.
   - The build produces a local binary (described as going into a `bin` directory), and installation is handled through the Makefile rather than a separate runtime deployment system.

11. **How the pieces fit together**
   - In diagram terms, the flow is: **CLI input → pacx coordinator → package list / package info → URL generation → downloader (aria2c) → progress/print output**.
   - Supporting utilities like strings, colors, and formatting are cross-cutting concerns used by multiple stages.

12. **Overall architecture style**
   - This is a **modular monolithic CLI**: one executable, several focused C modules, and a narrow set of external tools.
   - The architecture is optimized for clarity and fast package download orchestration, not for extensibility via plugins or distributed components.

Main entry points: [`src/pacx.c`](https://github.com/abdurehmanimran/pacx/blob/main/src/pacx.c) (pacx), [`src/downloader.c`](https://github.com/abdurehmanimran/pacx/blob/main/src/downloader.c) (Downloader), [`src/packageinfo.c`](https://github.com/abdurehmanimran/pacx/blob/main/src/packageinfo.c) (Package info), [`src/str.c`](https://github.com/abdurehmanimran/pacx/blob/main/src/str.c) (Strings)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_g_runtime["Runtime flow"]
  node_n_pacx["pacx<br/>CLI coordinator<br/>[pacx.c]"]
  node_n_packagelist["Package list<br/>selection model<br/>[packagelist.c]"]
  node_n_packageinfo["Package info<br/>metadata model<br/>[packageinfo.c]"]
  node_n_urls["URL builder<br/>mirror resolver<br/>[urls.c]"]
  node_n_downloader["Downloader<br/>fetch engine<br/>[downloader.c]"]
  node_n_pacx_h["pacx.h<br/>public interface<br/>[pacx.h]"]
  node_n_packagelist_h["packagelist.h<br/>public interface<br/>[packagelist.h]"]
  node_n_packageinfo_h["packageinfo.h<br/>public interface<br/>[packageinfo.h]"]
  node_n_urls_h["urls.h<br/>public interface<br/>[urls.h]"]
  node_n_downloader_h["downloader.h<br/>public interface<br/>[downloader.h]"]
end

subgraph group_g_support["Support layers"]
  node_n_progress["Progress<br/>status tracking<br/>[progress.c]"]
  node_n_print["Print<br/>output formatting<br/>[print.c]"]
  node_n_str["Strings<br/>string utilities<br/>[str.c]"]
  node_n_colors(("Colors<br/>terminal styles<br/>[colors.h]"))
  node_n_progress_h["progress.h<br/>public interface<br/>[progress.h]"]
end

subgraph group_g_build["Build"]
  node_n_makefile["Makefile<br/>build script"]
end

node_n_pacx -->|"selects"| node_n_packagelist
node_n_pacx -->|"enriches"| node_n_packageinfo
node_n_packagelist -->|"feeds"| node_n_packageinfo
node_n_packageinfo -->|"resolves"| node_n_urls
node_n_urls -->|"hands off"| node_n_downloader
node_n_pacx -->|"orchestrates"| node_n_downloader
node_n_downloader -->|"reports"| node_n_progress
node_n_downloader -->|"emits"| node_n_print
node_n_progress -->|"renders via"| node_n_print
node_n_print -->|"styles with"| node_n_colors
node_n_pacx -->|"uses"| node_n_str
node_n_packagelist -->|"uses"| node_n_str
node_n_packageinfo -->|"uses"| node_n_str
node_n_urls -->|"uses"| node_n_str
node_n_downloader -->|"uses"| node_n_str
node_n_pacx -->|"declares"| node_n_pacx_h
node_n_packagelist -->|"declares"| node_n_packagelist_h
node_n_packageinfo -->|"declares"| node_n_packageinfo_h
node_n_urls -->|"declares"| node_n_urls_h
node_n_downloader -->|"declares"| node_n_downloader_h
node_n_progress -->|"declares"| node_n_progress_h
node_n_makefile -.->|"builds"| node_n_pacx

click node_n_pacx "https://github.com/abdurehmanimran/pacx/blob/main/src/pacx.c"
click node_n_packagelist "https://github.com/abdurehmanimran/pacx/blob/main/src/packagelist.c"
click node_n_packageinfo "https://github.com/abdurehmanimran/pacx/blob/main/src/packageinfo.c"
click node_n_urls "https://github.com/abdurehmanimran/pacx/blob/main/src/urls.c"
click node_n_downloader "https://github.com/abdurehmanimran/pacx/blob/main/src/downloader.c"
click node_n_progress "https://github.com/abdurehmanimran/pacx/blob/main/src/progress.c"
click node_n_print "https://github.com/abdurehmanimran/pacx/blob/main/src/print.c"
click node_n_str "https://github.com/abdurehmanimran/pacx/blob/main/src/str.c"
click node_n_colors "https://github.com/abdurehmanimran/pacx/blob/main/src/colors.h"
click node_n_makefile "https://github.com/abdurehmanimran/pacx/tree/main/Makefile"
click node_n_pacx_h "https://github.com/abdurehmanimran/pacx/blob/main/src/pacx.h"
click node_n_packagelist_h "https://github.com/abdurehmanimran/pacx/blob/main/src/packagelist.h"
click node_n_packageinfo_h "https://github.com/abdurehmanimran/pacx/blob/main/src/packageinfo.h"
click node_n_urls_h "https://github.com/abdurehmanimran/pacx/blob/main/src/urls.h"
click node_n_downloader_h "https://github.com/abdurehmanimran/pacx/blob/main/src/downloader.h"
click node_n_progress_h "https://github.com/abdurehmanimran/pacx/blob/main/src/progress.h"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_n_pacx,node_n_packagelist,node_n_packageinfo,node_n_urls,node_n_downloader,node_n_pacx_h,node_n_packagelist_h,node_n_packageinfo_h,node_n_urls_h,node_n_downloader_h toneBlue
class node_n_progress,node_n_print,node_n_str,node_n_colors,node_n_progress_h toneAmber
class node_n_makefile toneMint
```

## Components

### Runtime flow

Core CLI orchestration and download pipeline.

- [pacx](https://github.com/abdurehmanimran/pacx/blob/main/src/pacx.c): CLI coordinator · Entry point that interprets commands and orchestrates the package download workflow. · `src/pacx.c`
- [Package list](https://github.com/abdurehmanimran/pacx/blob/main/src/packagelist.c): selection model · Collects and manages the set of package targets pacx operates on. · `src/packagelist.c`
- [Package info](https://github.com/abdurehmanimran/pacx/blob/main/src/packageinfo.c): metadata model · Holds package metadata needed for URL construction and reporting. · `src/packageinfo.c`
- [URL builder](https://github.com/abdurehmanimran/pacx/blob/main/src/urls.c): mirror resolver · Converts package metadata into concrete download URLs. · `src/urls.c`
- [Downloader](https://github.com/abdurehmanimran/pacx/blob/main/src/downloader.c): fetch engine · Coordinates package retrieval, likely delegating to aria2c for parallel downloads. · `src/downloader.c`
- [pacx.h](https://github.com/abdurehmanimran/pacx/blob/main/src/pacx.h): public interface · Header for the main coordinator and top-level application interface. · `src/pacx.h`
- [packagelist.h](https://github.com/abdurehmanimran/pacx/blob/main/src/packagelist.h): public interface · Header for package selection and list management. · `src/packagelist.h`
- [packageinfo.h](https://github.com/abdurehmanimran/pacx/blob/main/src/packageinfo.h): public interface · Header for package metadata structures and accessors. · `src/packageinfo.h`
- [urls.h](https://github.com/abdurehmanimran/pacx/blob/main/src/urls.h): public interface · Header for URL generation and mirror resolution helpers. · `src/urls.h`
- [downloader.h](https://github.com/abdurehmanimran/pacx/blob/main/src/downloader.h): public interface · Header for the download orchestration layer. · `src/downloader.h`

### Support layers

Shared data handling, formatting, and terminal presentation.

- [Progress](https://github.com/abdurehmanimran/pacx/blob/main/src/progress.c): status tracking · Tracks and renders download progress feedback. · `src/progress.c`
- [Print](https://github.com/abdurehmanimran/pacx/blob/main/src/print.c): output formatting · Formats user-facing messages, status lines, and terminal output. · `src/print.c`
- [Strings](https://github.com/abdurehmanimran/pacx/blob/main/src/str.c): string utilities · Shared string parsing and formatting helpers used across modules. · `src/str.c`
- [Colors](https://github.com/abdurehmanimran/pacx/blob/main/src/colors.h): terminal styles · Color definitions and styling hints for terminal output. · `src/colors.h`
- [progress.h](https://github.com/abdurehmanimran/pacx/blob/main/src/progress.h): public interface · Header for progress tracking and reporting. · `src/progress.h`

### Build

Local build and packaging entry point.

- [Makefile](https://github.com/abdurehmanimran/pacx/tree/main/Makefile): build script · Build and installation entry point for the native binary. · `Makefile`

## Connections

- pacx → Package list: selects · Builds the working set of package targets.
- pacx → Package info: enriches · Collects package metadata for downstream processing.
- Package list → Package info: feeds · Provides package targets to metadata handling.
- Package info → URL builder: resolves · Transforms package metadata into download URLs.
- URL builder → Downloader: hands off · Supplies concrete artifacts to the download engine.
- pacx → Downloader: orchestrates · Starts and coordinates the fetch workflow.
- Downloader → Progress: reports · Updates progress during downloads.
- Downloader → Print: emits · Sends status and completion messages.
- Progress → Print: renders via · Uses terminal output for progress display.
- Print → Colors: styles with · Applies terminal colors to user-facing messages.
- pacx → Strings: uses · Shares string utilities for parsing and formatting.
- Package list → Strings: uses · Relies on string helpers for list handling.
- Package info → Strings: uses · Relies on string helpers for metadata manipulation.
- URL builder → Strings: uses · Uses string helpers to build and normalize URLs.
- Downloader → Strings: uses · Uses string helpers for request and path handling.
- pacx → pacx.h: declares · Top-level application interface.
- Package list → packagelist.h: declares · Package list interface.
- Package info → packageinfo.h: declares · Package metadata interface.
- URL builder → urls.h: declares · URL generation interface.
- Downloader → downloader.h: declares · Download orchestration interface.
- Progress → progress.h: declares · Progress interface.
- Makefile → pacx: builds · Compiles the main executable.