remove old overlays proc

pkgs/oizys/src/oizys/overlay.nim

@@ -1,65 +0,0 @@
-import std/macros
-
-type
-  OverlayKind = enum
-    oPre, oPost
-  OverlayProc = object
-    node: NimNode
-    kind: OverlayKind
-
-
-proc applyOverlay(child: NimNode, overlayProc: OverlayProc) =
-  let node = overlayProc.node
-  for p in node.params:
-    if p.kind == nnkIdentDefs:
-      child.params.add copyNimTree(p)
-  case overlayProc.kind:
-  of oPre:
-    let startIdx = if child.body[0].kind == nnkCommentStmt: 1 else: 0
-    for i in countdown(node.body.len()-1, 0):
-      child.body.insert(startIdx, copyNimTree(node.body[i]))
-  of oPost:
-    for stmt in node.body.children():
-      child.body.add copyNimTree(stmt)
-
-
-macro overlay*(x: untyped): untyped =
-  ##[
-   apply pre and post operations to procs:
-
-   ```nim
-   overlay:
-     proc pre(a: bool) =
-       echo "before"
-     proc post(c: bool) =
-       echo "after"
-     proc mine(b: bool) = 
-       echo "inside mine"
-   ```
-   would result in:
-   ```nim
-   proc pre(a: bool; b: bool; c: bool) =
-     echo "before"
-     echo "inside mine"
-     echo "after"
-   ```
-  ]##
-
-  result = newStmtList()
-  var overlays: seq[OverlayProc]
-  for child in x.children():
-    case child.kind:
-    of nnkProcDef:
-      case ($child.name):
-      of "pre": overlays.add OverlayProc(node: child, kind: oPre)
-      of "post": overlays.add OverlayProc(node: child, kind: oPost)
-      else: result.add child
-    else: result.add child
-
-  if overlays.len == 0:
-    error "failed to create overlays: didn't find proc pre() or proc post()"
-
-  for i, child in result.pairs():
-    if child.kind == nnkProcDef:
-      for overlay in overlays:
-        applyOverlay(child, overlay)