cupidfm

cupidfm is a terminal-based file manager implemented in C. It uses the ncurses library for the user interface, providing features like directory navigation, directory tree preview, file preview, file editing, and file information display.

Demo

Prerequisites

Terminal Requirements

For proper emoji display:

Make sure your terminal emulator supports Unicode and emoji rendering For proper emoji and icon display:

Install a Nerd Font (recommended):

# On Ubuntu/Debian:
mkdir -p ~/.local/share/fonts
cd ~/.local/share/fonts
curl -fLO https://github.com/ryanoasis/nerd-fonts/releases/download/v3.1.1/JetBrainsMono.zip
unzip JetBrainsMono.zip
fc-cache -fv

Configure your terminal:

Set your terminal font to "JetBrainsMono Nerd Font" (or another Nerd Font)
Ensure your terminal emulator supports Unicode and emoji rendering
Set your locale to support UTF-8: export LANG=en_US.UTF-8

Alternative fonts:

Noto Color Emoji (sudo apt install fonts-noto-color-emoji)
Fira Code Nerd Font
Hack Nerd Font

If emojis aren't displaying correctly:

Check your terminal supports Unicode: echo -e "\xf0\x9f\x93\x81"
Verify locale settings: locale
Try updating your terminal emulator to a newer version

Note: Some terminal emulators like Alacritty, iTerm2, Konsole, and Kitty are known to work better with unicode/emojis. Note: Image preview uses 256-color blocks or ANSI truecolor rendering. Kitty terminal users get native graphics protocol support for the highest quality image previews. Sixel-capable terminals (mlterm, foot, xterm, Konsole 22+, VTE 0.52+, Windows Terminal, iTerm2) get high-quality color-quantized image previews with dithering.

Libraries used

System/third-party dependencies:

ncurses (terminal UI)
libmagic (MIME/type detection)
OpenSSL (TLS/HTTPS support for cupidscript)
zlib, bzip2, and xz/liblzma (compression backends used by archive preview)
xclip (clipboard integration)

Project libraries (customized/updated versions):

cupidconf (config loader; this repo vendors a customized version in lib/cupidconf.c)
cupidscript (plugin scripting; linked as lib/libcupidscript.a)
cupidarchive (archive preview; linked as lib/libcupidarchive.a)
cupidimage (image preview; linked as lib/libcupidimage.a)
[cupidgit](https://github.com/cupidthecat/Please cupidgit/) (git status detection; linked as lib/libcupidgit.a)

To build and run cupidfm, you must have the following packages installed:

A C Compiler & Build Tools (e.g. gcc, make)
ncurses development libraries (for terminal handling)
libmagic development libraries (for MIME type detection)
OpenSSL development libraries (for HTTPS support in cupidscript)
zlib + bzip2 + xz development libraries (archive preview via cupidarchive)
xclip (for clipboard support)

Installing Dependencies on Ubuntu/Debian

Open a terminal and run:

sudo apt update
sudo apt install build-essential libncurses-dev libmagic-dev libssl-dev zlib1g-dev libbz2-dev liblzma-dev xclip

Installing Dependencies on Arch Linux

Open a terminal and run:

sudo pacman -Syu
sudo pacman -S base-devel ncurses file openssl zlib bzip2 xz xclip

Notes:

On Arch, the package named file provides libmagic.
The package base-devel installs gcc, make, and other essential build tools.

Building the Project

To compile the project, run the provided build script:

./dev.sh

This script invokes make (with predefined flags) to compile the source code and produce an executable named cupidfm.

Compilation Flags

The build script uses flags such as:

-Wall -Wextra -pedantic to enable warnings
Additional warnings (-Wshadow -Werror -Wstrict-overflow)
Sanitizers (-fsanitize=address -fsanitize=undefined) for debugging

Running the Program

After building, start cupidfm with:

./cupidfm

Error logs (if any) will be saved to log.txt.

Features

Navigate directories using arrow keys
View file details and preview supported file types
Display MIME types based on file content using libmagic
Archive preview for common formats (.zip, .tar, .tar.gz, .7z, etc.) via cupidarchive
Image preview for common image formats (PNG, JPEG, WebP, GIF, BMP, ICO, TIFF) rendered directly in the terminal via cupidimage:
- Kitty terminal: Native graphics protocol with full color fidelity and hardware acceleration
- Sixel terminals: High-quality color quantization with dithering support (mlterm, foot, xterm, Konsole 22+, VTE 0.52+, Windows Terminal, iTerm2)
- Truecolor terminals: ANSI escape sequence rendering with 24-bit color
- 256-color terminals: Fallback to 256-color palette rendering
Git integration - Visual git status indicators displayed inline with file listings via cupidgit:
- 🔴 Modified files (tracked files with uncommitted changes)
- 🟢 Untracked files (files not in git index)
- ⚪ Unmodified files (tracked files with no changes)
- Automatic repository detection when navigating directories
- No external git dependency - uses custom SHA-1 implementation
File type indicators with emoji icons:
- 📄 Text files
- 📝 C source files
- 🔣 JSON files
- 📑 XML files
- 🐍 Python files
- 🌐 HTML files
- 🎨 CSS files
- ☕ Java files
- 💻 Shell scripts
- 🦀 Rust files
- 📘 Markdown files
- 📊 CSV files
- 🐪 Perl files
- 💎 Ruby files
- 🐘 PHP files
- 🐹 Go files
- 🦅 Swift files
- 🎯 Kotlin files
- ⚡ Scala files
- 🌙 Lua files
- 📦 Archive files
Text editing capabilities within the terminal
Directory tree visualization with permissions
File information display (size, permissions, modification time)
Background directory size calculation with a live "Calculating... " progress display
Scrollable preview window
Tab-based window switching between directory and preview panes
Configure keybinds

Performance

CupidFM is optimized for speed and efficiency. Our comprehensive test suite (63 tests across 8 suites) and performance benchmarks demonstrate excellent performance characteristics:

Core Data Structure Performance

Vector Operations:
- Add 100 elements: 0.645 μs (645 ns)
- Element access: 1.95 ns
- Capacity management: 651-749 ns
VecStack Operations:
- Push/pop: 0.167 μs (166.5 ns) - 50% faster after optimization
- Peek: 2.03 ns (100x faster than push/pop, as expected)
- Large stack (1k elements): 15.6 μs

File System Operations

Path Join: 38-138 ns depending on complexity
Directory Reading:
- Small directories (/tmp): 42.6 μs (hot cache)
- Medium directories (/usr/lib, 99 entries): 10.5 μs (hot cache)
- Large directories (/usr/bin, 2,254 entries): 325.4 μs (hot cache)
Cold Cache Performance (realistic browsing scenario):
- First read is 1.75-3.8x slower than hot cache, demonstrating the importance of OS page caching
- Warm steady-state matches hot cache performance

Optimizations Applied

VecStack Optimizations - Achieved 32% performance improvement:
- Cached Vector length to eliminate redundant function calls
- Used Vector_set_len_no_free for push operations
- Pre-allocated capacity (10 elements) to reduce reallocations
Memory Safety - All critical memory issues fixed:
- Safe realloc usage with temporary pointers
- Proper memory cleanup in all data structures
- Zero memory leaks (validated with AddressSanitizer and Valgrind)
String Operations:
- strlen: 1.90 ns
- strncpy: 7.34 ns
- snprintf: 54.52 ns

For detailed performance analysis and test suite documentation, see TESTING_AND_PERFORMANCE.md.

Configuration

Keybinds (Quick Reference)

All keybinds are configurable via ~/.cupidfmrc. These are the defaults.

Browser Mode (Directory/Preview)

Action	Default
Move up	`KEY_UP`
Move down	`KEY_DOWN`
Go to parent directory	`KEY_LEFT`
Enter directory	`KEY_RIGHT`
Switch Directory/Preview pane	`Tab`
Exit	`F1`
Edit file (from Preview pane)	`^E`
Copy	`^C`
Paste	`^V`
Cut	`^X`
Delete	`^D`
Rename	`^R`
New file	`^N`
New directory	`Shift+N`
Fuzzy search	`^F`
Select all (current view)	`^A`
Open console	`^O`

Search Prompt

Action	Key
Move selection	`KEY_UP` / `KEY_DOWN`
Page	`PageUp` / `PageDown`
Accept (keep filtered list)	`Enter`
Cancel (restore previous selection)	`Esc`

Edit Mode

Action	Default
Move cursor	`KEY_UP` / `KEY_DOWN` / `KEY_LEFT` / `KEY_RIGHT`
Save	`^S`
Quit	`^Q`
Backspace	`KEY_BACKSPACE`

Default Keybindings

cupidfm comes with a set of default keybindings. On first run, if cupidfm cannot find a user configuration file, it will auto-generate one at:

~/.cupidfmrc

Below is a screenshot showing the start up

This auto-generated config file includes default bindings, for example: The default includes key_search=^F (Ctrl+F) for fuzzy search and key_new_dir=Shift+N for creating directories, both of which you can change by editing ~/.cupidfmrc and restarting CupidFM.

key_up=KEY_UP
key_down=KEY_DOWN
key_left=KEY_LEFT
key_right=KEY_RIGHT
key_tab=Tab
key_exit=F1

key_edit=^E
key_copy=^C
key_paste=^V
key_cut=^X
key_delete=^D
key_rename=^R
key_new=^N
key_search=^F
key_new_dir=Shift+N
key_select_all=^A
key_undo=^Z
key_redo=^Y
key_permissions=^P
key_console=^O

edit_up=KEY_UP
edit_down=KEY_DOWN
edit_left=KEY_LEFT
edit_right=KEY_RIGHT
edit_save=^S
edit_quit=^Q
edit_backspace=KEY_BACKSPACE
edit_copy=^C
edit_cut=^X
edit_paste=^V
edit_select_all=^A
edit_undo=^Z
edit_redo=^Y

Immediately after creating ~/.cupidfmrc for the first time, CupidFM will display a popup in the interface letting you know where it wrote your new config.

Editing the Config File

After CupidFM creates this file, you are free to edit it to customize keybindings or add new mappings. Here are some rules/notes:

Valid Formats
- You may use special ncurses names like KEY_UP, KEY_DOWN, KEY_LEFT, etc.
- You can assign Ctrl+key by using a caret, e.g. ^C.
- Single characters (a, b, x) are also valid.
Commenting and Whitespace
- Lines beginning with # are treated as comments and ignored.
- Blank or whitespace-only lines are also ignored.
Sample

If you only want to change the exit key from F1 to Esc, you might do:
```
key_exit=27
```
since ASCII 27 is Esc in decimal form.
Restart Required
- Changes to ~/.cupidfmrc take effect next time you launch CupidFM.

Where CupidFM Searches for the Config

~/.cupidfmrc
By default, CupidFM looks for this file in your home directory.
No config found?
- CupidFM loads hard-coded defaults (arrow keys, F1, etc.)
- Automatically writes a new file to ~/.cupidfmrc, which you can later edit.
Config exists but can’t be loaded?
- CupidFM keeps defaults and shows a Configuration Errors popup instead of overwriting your config.

Common Changes to the Config

Changing the Exit Key
```
key_exit=F10
```
or
```
key_exit=27  # 27 = ESC
```
Using Emacs-like Keys
If you prefer Ctrl+P for up and Ctrl+N for down:
```
key_up=^P
key_down=^N
```

Remapping Left/Right

key_left=KEY_BACKSPACE
key_right=KEY_ENTER

Troubleshooting

Config Not Created:
Make sure you have a valid $HOME environment variable set. If $HOME is missing or empty, CupidFM will try to create the config in the current directory instead.
Invalid or Unknown Key:
If you enter an invalid key name, it will be ignored and remain at default. Check the logs or run from a terminal to see error messages.
Changing Keybindings:
- If something stops working after changes, revert the line or remove it to fall back to the default.
- You can always delete ~/.cupidfmrc and relaunch to regenerate a fresh config.

With these steps, you can fully customize your keybindings in ~/.cupidfmrc. If you ever lose or remove it, CupidFM will rewrite the default file and let you know on the next run!

Syntax Highlighting

CupidFM features a powerful and extensible syntax highlighting system for the built-in text editor. Syntax highlighting enhances code readability by applying different colors to keywords, types, strings, comments, operators, and more.

Built-in Language Support

Out of the box, CupidFM includes syntax highlighting for:

C/C++ (.c, .h, .cpp, .hpp, .cc, .cxx, etc.)
Bash/Shell (.sh, .bash)
Markdown (.md, .markdown)

Installing Syntax Files

Syntax highlighting configuration files use the .cupidconf extension and are stored in:

~/.cupidfm/syntax/

To install a syntax file:

Create the syntax directory (if it doesn't exist):
```
mkdir -p ~/.cupidfm/syntax
```

Copy syntax files to the directory:

cp c.cupidconf ~/.cupidfm/syntax/
cp bash.cupidconf ~/.cupidfm/syntax/
cp md.cupidconf ~/.cupidfm/syntax/

Restart CupidFM to load the new syntax definitions.

Writing Custom Syntax Files

Syntax files use a simple key-value format. Here's how to create your own:

File Naming

Name your file <language>.cupidconf, for example:

python.cupidconf for Python
javascript.cupidconf for JavaScript
rust.cupidconf for Rust

Basic Structure

# Language name
language = python

# File extensions (comma-separated)
extensions = .py, .pyw, .pyi

# Keywords - control flow and main language keywords
keywords = if, else, elif, for, while, def, class, return, break, continue

# Statements - modifiers and declarations
statements = import, from, as, with, pass, yield, async, await, lambda

# Types - built-in types
types = int, str, float, bool, list, dict, tuple, set, None

# Constants - built-in constants
constants = True, False, None, __name__, __main__

# Preprocessor directives (language-specific)
preprocessor = 

# Comments
line_comment = #
block_comment_start = """
block_comment_end = """

# String delimiters
string_delim = "
char_delim = '

# Preprocessor character (e.g., # for C preprocessor)
preprocessor_char = 

# Colors (optional - uses Monokai theme by default)
color_keyword = #e87d3e
color_type = #b4d273
color_string = #e5b567
color_comment = #797979
color_number = #9e86c8
color_preprocessor = #b05279
color_operator = #e87d3e
color_function = #6c99bb

Configuration Options

Option	Description	Example
`language`	Language name (informational)	`python`
`extensions`	File extensions to match (comma-separated)	`.py, .pyw`
`keywords`	Control flow keywords (highlighted bold)	`if, else, for`
`statements`	Statement keywords and modifiers	`import, export, const`
`types`	Type keywords and built-in types	`int, str, void`
`constants`	Built-in constants	`true, false, NULL`
`preprocessor`	Preprocessor directive names	`define, include`
`line_comment`	Single-line comment delimiter	`//` or `#`
`block_comment_start`	Block comment start	`/*` or `"""`
`block_comment_end`	Block comment end	`*/` or `"""`
`string_delim`	String quote character	`"`
`char_delim`	Character quote	`'`
`preprocessor_char`	Preprocessor trigger character	`#`

Color Customization (Optional)

You can customize colors using hex format (#RRGGBB) or RGB format (R,G,B):

# Hex format
color_keyword = #e87d3e
color_type = #b4d273

# RGB format (alternative)
color_keyword = 232,125,62
color_type = 180,210,115

Available color options:

color_keyword - Control flow keywords
color_type - Type names and type keywords
color_string - String and character literals
color_comment - Comments
color_number - Numbers and constants
color_preprocessor - Preprocessor directives
color_operator - Operators (+, -, *, etc.)
color_function - Function calls

If colors are not specified, CupidFM uses the default Monokai theme.

Syntax Features

The syntax highlighter automatically detects and highlights:

Keywords - Control flow statements (bold orange)
Types - Type declarations and built-in types (green)
Strings - String and character literals (yellow)
- Escape sequences - Special highlighting for \n, \t, \xHH, etc. (bold purple)
Comments - Single-line and block comments (gray)
Numbers - Integer, floating-point, hex, binary, octal (purple)
Operators - Arithmetic and logical operators (orange)
Function calls - Functions followed by ( (blue)
Labels - Goto labels at line start (bold pink)
Constants - ALL_CAPS identifiers (purple)
Type suffixes - Identifiers ending with _t or _T (green)
Preprocessor - Directives like #include, #define (pink)
Block comments across scrolling - Maintains comment state when scrolling

Tips for Writing Syntax Files

Keep keyword lists manageable - Very long comma-separated lists can cause performance issues. Keep each category under 50 items.
Test with sample files - Create a test file with various language constructs to verify highlighting works correctly.
Order matters - More specific patterns should come before general ones in your lists.
Use comments - Document your syntax file with comments starting with #.
File extensions - Include all common extensions (e.g., .cpp, .cc, .cxx for C++).

Example: Simple Python Syntax

# Python Syntax Highlighting
language = python
extensions = .py, .pyw

keywords = if, else, elif, for, while, def, class, return
statements = import, from, with, as, pass
types = int, str, float, bool, list, dict, None
constants = True, False, None

line_comment = #
string_delim = "
char_delim = '

color_keyword = #e87d3e
color_type = #b4d273
color_string = #e5b567
color_comment = #797979

Troubleshooting

Syntax file not loaded: Ensure the file is in ~/.cupidfm/syntax/ and has the .cupidconf extension.
Colors not showing: Check that your terminal supports 256 colors (echo $TERM should show xterm-256color or similar).
Highlighting incomplete: Make sure all required fields are present (language, extensions, at least one keyword/type/statement).
Performance issues: Reduce the number of keywords/types in your syntax file if hovering over files causes lag.

Plugins (CupidScript)

CupidFM can load Cupidscript plugins (.cs) on startup.

By default it loads from your home directory:

~/.cupidfm/plugins
~/.cupidfm/plugin

Local/repo plugin folders are supported, but are disabled by default (to avoid accidentally executing repo scripts):

Enable local plugin loading with: CUPIDFM_LOAD_LOCAL_PLUGINS=1
Then CupidFM will also search:
- ./cupidfm/plugins and ./cupidfm/plugin
- ./plugins and ./plugin

Plugin Hooks

fn on_load()
fn on_key(key) -> return true to consume the keypress
fn on_dir_change(new_cwd, old_cwd)
fn on_selection_change(new_name, old_name)

CupidFM Script API

fm.notify(msg) / fm.status(msg) - show a notification
fm.popup(title, msg) - show a popup
fm.console_print(msg) / fm.console(msg) - append to the in-app console (^O by default)
fm.prompt(title, initial) -> string|nil
fm.confirm(title, msg) -> bool
fm.menu(title, items[]) -> index|-1
fm.cwd() - current directory
fm.selected_name() / fm.selected_path() - current selection
fm.cursor() / fm.count() - cursor index + list size
fm.search_active() / fm.search_query() - fuzzy search state
fm.pane() - "directory" or "preview"
fm.bind(key, func_name) - bind a key to a function (key can be "^T", "F5", "KEY_UP", or a numeric keycode)
File operations (integrated with undo/redo):
- fm.copy(path_or_paths, dst_dir)
- fm.move(path_or_paths, dst_dir)
- fm.rename(path, new_name)
- fm.delete(path_or_paths) (trash)
- fm.mkdir(name_or_path)
- fm.touch(name_or_path)
- fm.undo() / fm.redo()
fm.reload() - request a directory reload
fm.exit() - request CupidFM to quit
fm.cd(path) - change directory (absolute or relative)
fm.select(name) / fm.select_index(i) - move selection (best effort)
fm.key_name(code) / fm.key_code(name) - convert between keycodes and names

See plugins/examples/ for example scripts (not auto-loaded) and CUPIDFM_CUPIDSCRIPT_API.md for the full API reference.

Todo

High Priority

Add file filtering options
Write custom magic library for in-house MIME type detection

Features

Add a quick select feature for selecting file names, dir names, and current directory
Add configuration file support for customizing:
- Key bindings
- Color schemes
- Default text editor (using in house editor)
- File associations
- Change default text preview files
Basic file dialog for web and other applications
Use YSAP make-diagram program to learn more about files

Todo List for Command Line Feature

Completed

Edit Mode Issues

Banner marquee not rotating correctly when rotating in edit mode
- Fix issue casued by patch, they are in seperate locations dpeedning on timing
Fix banner not rotating when prompted eg. (new file or dir)
- Fix issue casued by patch, they are in seperate locations dpeedning on timing
Fix sig winch handling breaking while in edit mode
Fix cursor showing up at the bottom of the text editing buffer
Fix text buffer not scrolling to the right when typing and hitting the border of the window

Key Features to Implement

Command Line Interface (CLI) Feature

Overview

The Command Line Interface (CLI) for cupidfm will introduce a powerful way for users to perform common file operations directly from the application, similar to a terminal within the file manager. This feature will enable users to execute commands like navigating directories, opening files, copying/moving files, and even running system commands without leaving the cupidfm interface.

Planned Features for the CLI

Command Input:
- Users will have access to a bottom command bar where commands can be typed.
- Basic commands like cd, ls, open, copy, move, delete will be supported.
Command History:
- Pressing the Up/Down arrow keys will cycle through previously executed commands, similar to a traditional terminal.
Tab Completion:
- Auto-complete file and directory names by pressing TAB while typing a command.
Error Handling:
- Clear and descriptive error messages will be displayed in the command bar when commands fail (e.g., "File not found" or "Permission denied").
Custom cupidfm Commands:
- Extend the functionality of traditional file operations with cupidfm-specific commands, such as:
  - tree: Display the directory tree structure.
  - preview [file]: Quickly open a file in the preview window.
  - info [file/dir]: Show detailed information about a file or directory.
System Command Integration:
- Run standard shell commands like grep, find, chmod, and others directly from the cupidfm command bar.

Future Plans for File Operations Shortcuts

1. Command Bar Design

Add a command bar at the bottom of the cupidfm interface.
Display typed commands dynamically and update the UI to show results or error messages.

2. Command Execution

Parse and interpret user input.
Support basic file operations (open, cd, ls, copy, move, delete, etc.).
Integrate with system utilities for advanced commands.

3. Real-Time Feedback

Display real-time feedback or results in the command bar.
Handle errors gracefully and inform users of invalid commands or paths.

4. Custom Commands

Introduce cupidfm-specific commands for enhanced functionality, like:
- tree
- preview
- info

5. System Command Integration

Allow users to run basic shell commands without leaving the application.
Commands like grep and chmod should work seamlessly.

6. Configurable Aliases

Allow users to create command aliases for frequently used commands (e.g., alias ls to list).

Usage

Navigation:
- Up/Down: Move between files
- Left/Right: Navigate to parent/child directories
- F1: Exit the application
- TAB: Switch between directory and preview windows
- CONTROL+E: Edit file in preview window
- CONTROL+G: Save file while editing
- CONTROL+C: Copy selected file to clipboard
- CONTORL+V: Paste selected file to current location

Contributing

Contributions are welcome! Please submit a pull request or open an issue for any changes.

License

This project is licensed under the GNU General Public License v3.0 terms.

Name		Name	Last commit message	Last commit date
Latest commit History 286 Commits
cupidarchive		cupidarchive
examples		examples
img		img
lib		lib
mime_demo/mime_test		mime_demo/mime_test
plugins		plugins
src		src
syntax		syntax
tests		tests
.editorconfig		.editorconfig
.gitignore		.gitignore
CUPIDFM_CUPIDSCRIPT_API.md		CUPIDFM_CUPIDSCRIPT_API.md
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
TESTING_AND_PERFORMANCE.md		TESTING_AND_PERFORMANCE.md
dev.sh		dev.sh
install.sh		install.sh

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cupidfm

Demo

Prerequisites

Terminal Requirements

Libraries used

Installing Dependencies on Ubuntu/Debian

Installing Dependencies on Arch Linux

Building the Project

Compilation Flags

Running the Program

Features

Performance

Core Data Structure Performance

File System Operations

Optimizations Applied

Configuration

Keybinds (Quick Reference)

Browser Mode (Directory/Preview)

Search Prompt

Edit Mode

Default Keybindings

Editing the Config File

Where CupidFM Searches for the Config

Common Changes to the Config

Troubleshooting

Syntax Highlighting

Built-in Language Support

Installing Syntax Files

Writing Custom Syntax Files

File Naming

Basic Structure

Configuration Options

Color Customization (Optional)

Syntax Features

Tips for Writing Syntax Files

Example: Simple Python Syntax

Troubleshooting

Plugins (CupidScript)

Plugin Hooks

CupidFM Script API

Todo

High Priority

Features

Todo List for Command Line Feature

Completed

Edit Mode Issues

Key Features to Implement

Command Line Interface (CLI) Feature

Overview

Planned Features for the CLI

Future Plans for File Operations Shortcuts

1. Command Bar Design

2. Command Execution

3. Real-Time Feedback

4. Custom Commands

5. System Command Integration

6. Configurable Aliases

Usage

Contributing

License

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