1	# add/run: the interpreter for `ez add`. It reads the directory it runs in,
2	# HOME, ez.toml and `.gitignore` into a World, then loops: it asks the
3	# planner (add/plan.bend) what is still open, answers each question with the
4	# lock's interpreter (`Run.answer.ups`: what git prints for tags, HEAD or a
5	# ref, and a checkout at a rev with its NAR hash and every file's text; for a
6	# hub package's name, `Run.answer.all`: what the hub says the name names, and
7	# the package's manifest and files), and adds the answers to the World, until
8	# nothing is left to ask. Then it runs
9	# the planner's plan with the lock's effect runner (`Run.exec.plan`), which
10	# exits 1 with the reason when the plan refuses. It decides nothing; that it
11	# reads and executes faithfully is EZ-TRUST-2.
12	import Base
13	import 0xead4c7939c9eaca8d47da53b4496b731/main.bend as R
14	import ../io/file.bend as F
15	import ../lock/run.bend as Run
16	import ../lock/up.bend as Up
17	import ../lock/world.bend as W
18	import ./world.bend as A
19	import ./plan.bend as AP
20	
21	# the World with more answers in it
22	def more(world: A.World, rs: List<&2, Up.Reply>) -> A.World:
23	  A.World{args, here, home, ledger, ignore, replies, hubs} = world
24	  A.World{args, here, home, ledger, ignore, List.append(&2, Up.Reply, replies, rs), hubs}
25	
26	# the World with more of the hub's answers in it
27	def more.hub(world: A.World, rs: List<&2, W.Reply>) -> A.World:
28	  A.World{args, here, home, ledger, ignore, replies, hubs} = world
29	  A.World{args, here, home, ledger, ignore, replies, List.append(&2, W.Reply, hubs, rs)}
30	
31	# the planner's step: its questions answered and the loop gone round again,
32	# or its plan run
33	def loop.step(st: AP.Next, +lib: String, world: A.World, go: A.World -> IO(Unit)) -> IO(Unit):
34	  match st:
35	    case AP.AskGit{asks}:
36	      do IO<Unit>:
37	        rs : List<&2, Up.Reply> <- Run.answer.ups(lib, asks)
38	        go(more(world, rs))
39	    case AP.AskHub{asks}:
40	      do IO<Unit>:
41	        rs : List<&2, W.Reply> <- Run.answer.all(lib, asks)
42	        go(more.hub(world, rs))
43	    case AP.Planned{pl}:
44	      Run.exec.plan(lib, pl)
45	
46	# the rounds the loop may take. The planner asks at most three rounds for a
47	# git target and two for a name, so this is only a guard against a planner
48	# that keeps asking, and running out of it dies loudly.
49	def rounds() -> Nat:
50	  U32.to_nat(100)
51	
52	# the loop, under fuel. Every round adds an answer, since the planner never
53	# asks what the World answers already, and it asks at most three rounds for
54	# a git target and two for a name, so the fuel is only a guard.
55	def loop(fuel: Nat, +lib: String, +world: A.World) -> IO(Unit):
56	  match fuel:
57	    case 0n:
58	      IO.die(Unit, 1, "ez: ez add kept asking questions")
59	    case 1n+f:
60	      loop.step(AP.next(world), lib, world, w => loop(f, lib, w))
61	
62	# `ez add <target> [ref] [entry.bend] [--rename NAME]`
63	def run(+target: String, +ref: String, +entry: String, +rename: String) -> IO(Unit):
64	  do IO<Unit>:
65	    lib : String <- Run.bend.lib()
66	    +pwd : String <- R.exec(["pwd"])
67	    h : Result<&1, &1, U32 & String, String> <- IO.get_env("HOME")
68	    led : Maybe<&2, String> <- F.read(A.toml())
69	    ig : Maybe<&2, String> <- F.read(A.ignore.file())
70	    loop(rounds(), lib, A.World{A.Args{target, ref, entry, rename}, String.trim(R.text(pwd)),
71	      Run.env.text(h), led, F.text_of(ig), [], []})