Viuwa

Viuwa is a simple terminal ANSI image viewer trying to maintain bare-minimum compatibility with the wasm32-wasi target.

It uses almost exclusively ANSI escape codes to display images in the terminal.

Kitty, Sixel, and Iterm2 protocols are not supported, There are better tools such as viu or timg for cross-protocol terminal image viewing, please go and give them love.

Pull requests implementing different protocols are allowed as long as they don't break wasm32-wasi+ANSI compatibility.

Installation

bash cargo install viuwa

or for latest version

bash git clone https://github.com/WanderLanz/Viuwa.git && cd Viuwa && cargo install --path .

wasm file is also available in the releases section (with rayon feature disabled).

Features

rayon: Enables both rayon-resizer and rayon-converter. This is enabled by default.
rayon-resizer: Enables parallel image resizing.
rayon-converter: Enables parallel ANSI image generation.

Usage

Windowed image viewing (e.g. Vim)

bash viuwa [image]

Directly to command line (e.g. Catimg)

bash viuwa [image] --inline

For more advanced usage, see the help page

bash viuwa --help

Examples

inlined w/ nearest filter

cli-f1

tui w/ triangle filter

tui-f2

tui help

tui-help

Configuration

Environment variables

VIUWA_QUIET: If set to true, viuwa will not print any messages or warnings.
VIUWA_FILTER: Set the filter type to use when resizing the image. Possible values are Nearest, Triangle, CatmullRom, Gaussian, Lanczos3. Defaults to Nearest.
VIUWA_COLOR: Set the color type of the output ansi image. Possible values are Truecolor, 256, Gray, and 256Gray. Defaults to Truecolor.
VIUWA_CORRECT: Set the luma correction level for 256 color mode, allows more pixels to be converted to grayscale for better contrast. 0-100, Defaults to 100.

With inline flag:

VIUWA_INLINE: If set to true, viuwa will inline the resulting ANSI image instead of using a tui.
VIUWA_WIDTH: Set width of inlined ANSI image, else does nothing.
VIUWA_HEIGHT: Set height of inlined ANSI image, else does nothing.

Known Issues

On wasm, ANSI raw mode sequences are commonly ignored, so you may need to press enter to send input to the program.
Some wasm runtimes may kill the program in its windowed/tui mode. May cause terminal to be left in a weird state and may require restarting the terminal if terminal doesn't soft reset itself.