Initial msg utility

This can replace xdg-open.

.gitignore

@@ -1,2 +1,3 @@
 http_translator
 json_translator
+msg

README.md

@@ -9,3 +9,8 @@ See [http_translator.config-example.pr](./http_translator.config-example.pr) for
 ## json_translator
 
 Wrapper that executes a command, parses its JSON output, and asserts a Preserves conversion in an `<output …>` record.
+
+
+## msg
+
+A utility that sends a message to $SYNDICATE_SOCK in the form `<ARGV…>`.

src/msg.nim

@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: ☭ 2022 Emery Hemingway
+# SPDX-License-Identifier: Unlicense
+
+import std/[asyncdispatch, os]
+from std/sequtils import map
+import preserves, syndicate, syndicate/capabilities
+
+proc unixSocketPath: string =
+  result = getEnv("SYNDICATE_SOCK")
+  if result == "":
+    result = getEnv("XDG_RUNTIME_DIR", "/run/user/1000") / "dataspace"
+
+proc mintCap: SturdyRef =
+  var key: array[16, byte]
+  mint(key, "syndicate")
+
+bootDataspace("main") do (root: Ref; turn: var Turn):
+  let label = getAppFilename().extractFilename
+  connectUnix(turn, unixSocketPath(), mintCap()) do (turn: var Turn; ds: Ref):
+    var a = initRecord[Ref](label, commandLineParams().toPreserve(Ref))
+    message(turn, ds, a)
+
+for i in 0..7: poll(20)
+  # A hack to exit

syndicate_utils.nimble

@@ -5,7 +5,7 @@ author        = "Emery Hemingway"
 description   = "Utilites for Syndicated Actors and Synit"
 license       = "unlicense"
 srcDir        = "src"
-bin           = @["http_translator", "json_translator"]
+bin           = @["http_translator", "json_translator", "msg"]
 
 
 # Dependencies