From 20c183910dcf73e520caa366528f648434e98b00 Mon Sep 17 00:00:00 2001
From: Florian Schroedl <flo.schroedl@gmail.com>
Date: Wed, 4 May 2022 17:00:00 +0200
Subject: [PATCH] Watch

---
 shell.nix        |  1 +
 src/js/watch.nim | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/js/watch.nim

diff --git a/shell.nix b/shell.nix
index 7ae19f3..390f427 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,5 +10,6 @@ pkgs.mkShell {
   buildInputs = with pkgs; buildInputs ++ [
     nim
     nimlsp
+    fswatch
   ];
 }
diff --git a/src/js/watch.nim b/src/js/watch.nim
new file mode 100644
index 0000000..ac98002
--- /dev/null
+++ b/src/js/watch.nim
@@ -0,0 +1,54 @@
+import times, posix, strutils, os
+import strformat
+import times
+import libfswatch
+import std/[streams, osproc]
+
+import libfswatch
+import libfswatch/fswatch
+
+let file = "/home/floscr/Code/Projects/org-parser/src/js/example/sandbox.nim"
+
+var ps: seq[Process]
+
+proc compile(path: string) =
+  echo "Compiling..."
+  let p = startProcess(
+    "nim",
+    args= [
+      "js",
+      "--verbosity:0",
+      "--hint[Processing]:off",
+      "--hint[XDeclaredButNotUsed]:off",
+      "--hint[DuplicateModuleImport]:off",
+      "--excessiveStackTrace:on",
+      "--warning[UnusedImport]:off",
+      path,
+    ],
+    options = {poUsePath, poStdErrToStdOut}
+  )
+  ps.add(p)
+  discard p.waitForExit()
+
+  var line: string
+  while p.running() and p.outputStream.readLine(line):
+    echo line
+
+  echo "Compilation Finished"
+  p.close()
+  ps = @[]
+
+proc monitorCallback(event: fsw_cevent, event_num: cuint) =
+  echo event_num
+  if event_num == 10:
+    echo &"""[{times.now().format("yyyy-MM-dd HH:MM:ss")}]: {event.path} was modified. Compiling..."""
+    for p in ps:
+      p.close()
+    ps = @[]
+
+    compile(file)
+
+var mon = newMonitor()
+mon.addPath(file)
+mon.setCallback(monitorCallback)
+mon.start()