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fnord
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lib/ui/formatter.ex
defmodule UI.Formatter do
@moduledoc """
Formats output strings using an external command specified by the
`FNORD_FORMATTER` environment variable. If unset or empty, returns the
original string. On command failure or non-zero exit code, logs a warning and
returns the original string.
Note: We invoke the formatter via `shell -c`, which may be subject to shell
injection if `FNORD_FORMATTER` contains malicious content. This CLI is
intended for trusted environments, so this risk is accepted.
"""
require Logger
# Allow a slightly more generous timeout; if it elapses, we fallback gracefully.
@timeout_ms 1_000
@spec format_output(binary) :: binary
def format_output(input) do
# Sanitize input to valid UTF-8 binary
input =
if(is_binary(input), do: input, else: to_string(input))
|> String.replace_invalid("�")
try do
if UI.quiet?() do
input
else
case System.get_env("FNORD_FORMATTER") do
nil ->
input
"" ->
input
formatter ->
shell = System.get_env("SHELL") || "/bin/sh"
Util.Temp.with_tmp(input, fn tmpfile ->
task =
Services.Globals.Spawn.async(fn ->
System.cmd(shell, ["-c", "cat #{tmpfile} | #{formatter}"],
stderr_to_stdout: true
)
end)
case Task.yield(task, @timeout_ms) do
{:ok, {output, 0}} ->
# Sanitize output to valid UTF-8 binary
output = String.replace_invalid(output, "�")
output
{:ok, {_, exit_code}} ->
Logger.warning(
"Formatter command failed: #{formatter} (exit code: #{exit_code})"
)
input
nil ->
# Timed out; make sure we don’t leak the task and fall back safely.
Task.shutdown(task, :brutal_kill)
Logger.warning(
"Formatter command timed out after #{@timeout_ms}ms: #{formatter}"
)
input
end
end)
end
end
rescue
_ -> input
end
end
end