mirror of
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66 lines
2.9 KiB
Python
66 lines
2.9 KiB
Python
"""Turn the install commands people already paste from READMEs into a skill id we can install.
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The ecosystem's grammar is `npx skills add <name>`, and every neighbouring form (npm/pnpm/bunx,
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`install` instead of `add`, a bare `@scope/name`, a skills.sh URL, or just the name) means the same
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thing to the person pasting it. Accepting only our own button was the friction."""
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import re
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from typing import Optional
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from typeguard import typechecked
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# The runners people actually have in their muscle memory.
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P_RUNNERS = ("npx", "npm", "pnpm", "pnpx", "yarn", "bunx", "bun", "deno")
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P_VERBS = ("add", "install", "i")
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# `pnpm dlx` and `yarn dlx` are those managers' npx, and dlx is the form READMEs actually print.
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P_RUNNER_SUBCOMMANDS = ("dlx", "exec", "run")
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P_SKILL_ID = re.compile(r"^[A-Za-z0-9@._/-]+$")
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@typechecked
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def parse_install_command(raw: str) -> Optional[str]:
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"""Return the skill id a pasted command refers to, or None when it is not an install command.
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None means "I could not read this", never a guess: installing the wrong skill because a paste
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was ambiguous is worse than asking the user to pick from the list."""
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text = (raw or "").strip()
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if not text:
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return None
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# A skills.sh (or GitHub) URL carries the id in its last meaningful path segment.
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if text.startswith(("http://", "https://")):
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parts = [p for p in text.split("?")[0].split("#")[0].rstrip("/").split("/") if p]
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tail = parts[-1] if parts else ""
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return tail if tail and P_SKILL_ID.match(tail) else None
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# Strip a leading shell prompt or copy artifact ("$ npx ...").
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text = re.sub(r"^[$>#]\s*", "", text)
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tokens = text.split()
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if not tokens:
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return None
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if tokens[0].lower() in P_RUNNERS:
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# npx skills add <id> | npm i skills <id> | bunx skills add <id>
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rest = [t for t in tokens[1:] if not t.startswith("-")]
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if rest and rest[0].lower() in P_RUNNER_SUBCOMMANDS:
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rest = rest[1:]
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# The verb and the package name arrive in either order ("npx skills add x", "npm i skills x"),
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# so strip both, in whichever order they appear.
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named_registry = False
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for _ in range(2):
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if rest and rest[0].lower() in ("skills", "skill", "@skills/cli", "openswarm"):
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rest = rest[1:]
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named_registry = True
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elif rest and rest[0].lower() in P_VERBS:
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rest = rest[1:]
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# Without the registry name this is just some other npx command, and `npx create-react-app foo`
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# must never read as "install the create-react-app skill".
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if not named_registry:
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return None
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candidate = rest[0] if rest else ""
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return candidate if candidate and P_SKILL_ID.match(candidate) else None
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# A bare id or scoped package pasted on its own.
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if len(tokens) == 1 and P_SKILL_ID.match(tokens[0]) and "." not in tokens[0].split("/")[-1][:1]:
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return tokens[0]
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return None
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