md_render_lib 0.1.0

A lib for rendering markdown in terminal
Documentation 
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// Copyright 2018-2020 Sebastian Wiesner <sebastian@swsnr.de>

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

// 	http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! SVG "rendering" for mdcat.

use std::io::prelude::*;
use std::io::{Error, ErrorKind, Result};
use std::process::{Command, Stdio};

/// Render an SVG image to a PNG pixel graphic for display.
pub fn render_svg(svg: &[u8]) -> Result<Vec<u8>> {
    render_svg_with_rsvg_convert(svg)
}

/// Render an SVG file with `rsvg-convert`.
fn render_svg_with_rsvg_convert(svg: &[u8]) -> Result<Vec<u8>> {
    let mut process = Command::new("rsvg-convert")
        .arg("--dpi-x=72")
        .arg("--dpi-y=72")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()?;

    process
        .stdin
        .as_mut()
        .expect("Forgot to pipe stdin?")
        .write_all(svg)?;

    let output = process.wait_with_output()?;

    if output.status.success() {
        Ok(output.stdout)
    } else {
        Err(Error::new(
            ErrorKind::Other,
            format!(
                "rsvg-convert failed with status {}: {}",
                output.status,
                String::from_utf8_lossy(&output.stderr)
            ),
        ))
    }
}