1	# share/pin: a plain `ez lock` refuses a `[tools.*]` pin it would have to fill.
2	# It copies every pin as the ledger has it and never asks a remote, so a pin
3	# with no commit or no NAR hash stops it, naming the upgrade that fills the
4	# pin. Filling and moving a pin is `ez lock --upgrade`'s, in lock/up.bend.
5	import Base
6	import ../ledger/manifest.bend as M
7	
8	# why a plain lock cannot copy a git pin as it stands, or "" when it can. The
9	# lock copies `rev` and `narHash` out of the ledger and never asks a remote
10	# for them, so a pin missing either is refused rather than filled, and the
11	# upgrade that fills it is named.
12	def gap.git(no_rev: Bool, no_nar: Bool, +name: String) -> String:
13	  match no_rev:
14	    case True{}:
15	      "ez: tools." ++ name ++ " has no rev; run `ez lock --upgrade --package " ++
16	        name ++ "` to pin it"
17	    case False{}:
18	      match no_nar:
19	        case True{}:
20	          "ez: tools." ++ name ++ " has no narHash; run `ez lock --upgrade --package " ++
21	            name ++ "` to pin it"
22	        case False{}:
23	          ""
24	
25	# why a plain lock cannot copy a pin as it stands, or "" when it can. A pin
26	# with no repo has nothing to pin, under a plain lock or an upgrade.
27	def gap(pin: M.Tool) -> String:
28	  M.Tool{n, _e, _b, s} = pin
29	  match s:
30	    case M.Hub{_named}:
31	      "ez: tools." ++ n ++ " has no git"
32	    case M.Git{_url, rev, _tag, _root, nar, _vend}:
33	      gap.git(String.is_empty(rev), String.is_empty(nar), n)
34	
35	# this pin's gap when it has one, otherwise the rest's. The rest arrives as a
36	# thunk and only the arm that wants it applies it, so the first gap stops the
37	# scan.
38	def gaps.step(none: Bool, here: String, rest: Unit -> String) -> String:
39	  match none:
40	    case True{}:
41	      rest(Unit{})
42	    case False{}:
43	      here
44	
45	# the first pin, in ledger order, a plain lock cannot copy, or "" when it can
46	# copy every one
47	def gaps(ts: List<&2, M.Tool>) -> String:
48	  match ts:
49	    case []:
50	      ""
51	    case h <> t:
52	      +here = gap(h)
53	      gaps.step(String.is_empty(here), here, _u => gaps(t))