Full installation instructions for Linux

[faultyserver]

The instructions are mostly complete, but not that great, and still leave a lot of the exact details for the reader to figure out. It'd be a lot better to have complete, exact instructions for installation.

Here are the steps that I ran to install v0.1.0 on an Ubuntu system:

# Pull a stable source
wget https://github.com/myst-lang/myst/archive/v0.1.0.tar.gz
# Extract it
tar xvf v0.1.0.tar.gz
cd myst-0.1.0
# Build the executable
shards build
# Link it to somewhere in $PATH
sudo ln -s /path/to/bin/myst /usr/local/bin/myst
# Run a test file
echo "[1,2,3].each{ |e| IO.puts(e) }" > test.mt
myst test.mt

Some notes on what should be expanded:

• Explain what sources are available for download. (Link to the latest release. Maybe also the current master source?)
• Explain various linking strategies (ln -s to /local/bin, or add the directory to $PATH)
• Explain that stdlib needs to be available one directory up from the executable.