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lib/services/approvals/shell/prefix.ex
defmodule Services.Approvals.Shell.Prefix do
@moduledoc """
Pure helper to extract a stable prefix for shell approvals.
"""
# Command families that support subcommands
@subcmd_families ~w(
aws az brew cargo docker gcloud gh git go helm just
kubectl make mix npm pip pip3 pnpm poetry rye
terraform uv yarn
)
@doc """
Given a base command and its args, return:
- "cmd sub" if a first positional token (subcommand) exists,
- "cmd" otherwise.
"""
@spec extract(String.t(), [String.t()]) :: String.t()
def extract(cmd, args) when cmd in @subcmd_families do
case find_first_positional(args) do
nil -> cmd
sub -> "#{cmd} #{sub}"
end
end
def extract(cmd, _args), do: cmd
@doc false
@spec find_first_positional([String.t()]) :: String.t() | nil
defp find_first_positional([]), do: nil
# Skip flags (inline-value, negation, or with separate value) to find the first positional
defp find_first_positional([flag = <<"-" <> _rest::binary>> | rest]) do
cond do
# Inline-value or negation flag: skip only the flag
String.contains?(flag, "=") or String.starts_with?(flag, "--no-") ->
find_first_positional(rest)
true ->
# Flag that may take a separate value: if next token is a non-flag, skip it too
case rest do
[next | tail] ->
if String.starts_with?(next, "-") do
# next is another flag: skip only the original flag
find_first_positional(rest)
else
# next is a positional value for the flag: skip both
find_first_positional(tail)
end
[] ->
# no more tokens
find_first_positional(rest)
end
end
end
# Any positional argument is the first
defp find_first_positional([pos | _]), do: pos
end