Add initial swaybar_status_actor utility

README.md

@@ -89,7 +89,7 @@ bootDataspace("main") do (dataspace: Ref; turn: var Turn):
 
 ## Examples
 
-- [simpleChatProtocol](tests/chat.nim)
+- [src/syndicate/unix](./src/syndicate/unix)
 - [erisresolver](https://codeberg.org/eris/nim-eris_utils#erisresolver) - dynamic configuration
 - [xdg_open_ng](https://git.syndicate-lang.org/ehmry/xdg_open_ng) - messaging, UNIX sockets, dynamic configuration, [Syndicate server](https://synit.org/book/operation/system-bus.html) interaction.
 

src/syndicate/unix/swaybar_status_actor.nim

@@ -0,0 +1,50 @@
+# SPDX-FileCopyrightText: ☭ 2022 Emery Hemingway
+# SPDX-License-Identifier: Unlicense
+
+## See the swaybar-protocol(7) manpage.
+
+import std/[asyncdispatch, json, os, strutils]
+import preserves, preserves/jsonhooks
+import syndicate, syndicate/capabilities
+
+proc unixSocketPath: string =
+  let args = commandLineParams()
+  case args.len
+  of 1: result = args[0]
+  of 0:
+    result = getEnv("SYNDICATE_SOCK")
+    if result == "":
+      result = getEnv("XDG_RUNTIME_DIR", "/run/user/1000") / "dataspace"
+  else: quit "must pass Syndicate socket location as the only argument"
+
+proc mintCap: SturdyRef =
+  var key: array[16, byte]
+  mint(key, "syndicate")
+
+type SwaybarStatus {.preservesRecord: "swaybar-status".} = object
+  elem: JsonNode
+
+bootDataspace("main") do (root: Ref; turn: var Turn):
+  let header = %* { "version": 1 }
+  stdout.write(header, "\x0a")
+  stdout.flushFile()
+  stdout.write("[")
+  connectUnix(turn, unixSocketPath(), mintCap()) do (turn: var Turn; ds: Ref):
+
+    var lineElements = initSet[Ref]()
+    proc sendLine(turn: var Turn) =
+      var line: JsonNode
+      if fromPreserve(line, lineElements):
+        stdout.writeLine(line, ",")
+        stdout.flushFile()
+      else:
+        stderr.writeLine "could not convert ", lineElements
+
+    during(turn, ds, ?SwaybarStatus) do (a: Assertion):
+      lineElements.incl a
+      sendLine(turn)
+    do:
+      lineElements.excl a
+      sendLine(turn)
+
+runForever()

syndicate.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version = "20220904"
+version = "20221013"
 author        = "Emery Hemingway"
 description   = "Syndicated actors for conversational concurrency"
 license       = "Unlicense"
@@ -9,4 +9,4 @@ srcDir        = "src"
 
 # Dependencies
 
-requires "nim >= 1.4.8", "nimSHA2 >= 0.1.1", "preserves >= 20220709"
+requires "nim >= 1.4.8", "nimSHA2 >= 0.1.1", "preserves >= 20221013"