87 lines
2.4 KiB
Nim
87 lines
2.4 KiB
Nim
# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[os, tables]
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import preserves
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import syndicate, syndicate/[actors, capabilities, durings, patterns]
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proc unixSocketPath: Unix =
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result.path = getEnv("SYNDICATE_SOCK")
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if result.path == "":
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result.path = getEnv("XDG_RUNTIME_DIR", "/run/user/1000") / "dataspace"
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proc envStep: Assertion =
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var s = getEnv("SYNDICATE_STEP")
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if s != "": parsePreserves(s, Cap)
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else: capabilities.mint().toPreserve(Cap)
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proc parsePattern(pr: Assertion): Pattern =
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let
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dropSigil = initRecord("lit", "_".toSymbol(Cap))
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grabSigil = initRecord("lit", "?".toSymbol(Cap))
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var pr = grab(pr).toPreserve(Cap)
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apply(pr) do (pr: var Assertion):
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if pr == dropSigil:
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pr = initRecord[Cap]("_")
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elif pr == grabSigil:
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pr = initRecord("bind", initRecord[Cap]("_"))
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doAssert result.fromPreserve(pr)
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proc inputPattern: Pattern =
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var args = commandLineParams()
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if args.len != 1 or args == @[""]:
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quit "expected a single pattern argument"
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else:
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var
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pr: Assertion
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input = pop args
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try: pr = parsePreserves(input, Cap)
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except ValueError:
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quit "failed to parse Preserves argument"
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result = parsePattern(pr)
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type DumpEntity {.final.} = ref object of Entity
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assertions: Table[Handle, seq[Assertion]]
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proc toLine(values: seq[Assertion]; prefix: char): string =
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result = newStringOfCap(1024)
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let sep = getEnv("FS", " ")
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result.add(prefix)
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for v in values:
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add(result, sep)
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add(result, $v)
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add(result, '\n')
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method publish(dump: DumpEntity; turn: var Turn; ass: AssertionRef; h: Handle) =
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var values = ass.value.sequence
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stdout.write(values.toLine('+'))
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stdout.flushFile()
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dump.assertions[h] = values
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method retract(dump: DumpEntity; turn: var Turn; h: Handle) =
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var values: seq[Assertion]
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if dump.assertions.pop(h, values):
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stdout.write(values.toLine('-'))
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stdout.flushFile()
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method message*(dump: DumpEntity; turn: var Turn; ass: AssertionRef) =
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stdout.write(ass.value.sequence.toLine('!'))
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stdout.flushFile()
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proc exitProc() {.noconv.} =
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stdout.write('\n')
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quit()
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proc main =
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let
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unix = unixSocketPath()
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step = envStep()
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pat = inputPattern()
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entity = DumpEntity()
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runActor("syndex_card") do (root: Cap; turn: var Turn):
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connect(turn, unix, step) do (turn: var Turn; ds: Cap):
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discard observe(turn, ds, pat, entity)
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setControlCHook(exitProc)
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main()
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