defmodule Mix.Tasks.Pandoc.Install do
@moduledoc """
Installs pandoc under `_build`.
```bash
$ mix pandoc.install
$ mix pandoc.install --if-missing
```
By default, it installs #{Pandoc.latest_version()} but you can configure it
in your config files, such as:
config :pandoc, :version, "#{Pandoc.latest_version()}"
## Options
* `--runtime-config` - load the runtime configuration before executing
command
* `--if-missing` - install only if the given version does not exist
"""
@shortdoc "Installs pandoc under _build"
@compile {:no_warn_undefined, Mix}
use Mix.Task
@impl true
def run(args) do
valid_options = [runtime_config: :boolean, if_missing: :boolean]
{opts, base_url} =
case OptionParser.parse_head!(args, strict: valid_options) do
{opts, []} ->
{opts, Pandoc.default_base_url()}
{opts, [base_url]} ->
{opts, base_url}
{_, _} ->
Mix.raise("""
Invalid arguments to pandoc.install, expected one of:
mix pandoc.install
mix pandoc.install 'https://github.com/jgm/pandoc/releases/download/$version/pandoc-$version-$target.tar.gz'
mix pandoc.install --runtime-config
mix pandoc.install --if-missing
""")
end
if opts[:runtime_config], do: Mix.Task.run("app.config")
if opts[:if_missing] && latest_version?() do
:ok
else
if function_exported?(Mix, :ensure_application!, 1) do
Mix.ensure_application!(:inets)
Mix.ensure_application!(:ssl)
end
Mix.Task.run("loadpaths")
Pandoc.install(base_url)
end
end
defp latest_version?() do
version = Pandoc.configured_version()
match?({:ok, ^version}, Pandoc.bin_version())
end
end