1 files changed, 44 insertions, 0 deletions
diff --git a/compiler/packagehandling.nim b/compiler/packagehandling.nim
new file mode 100644
index 000000000..30f407792
--- /dev/null
+++ b/compiler/packagehandling.nim
@@ -0,0 +1,44 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2017 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+iterator myParentDirs(p: string): string =
+  # XXX os's parentDirs is stupid (multiple yields) and triggers an old bug...
+  var current = p
+  while true:
+    current = current.parentDir
+    if current.len == 0: break
+    yield current
+
+proc getNimbleFile*(conf: ConfigRef; path: string): string =
+  ## returns absolute path to nimble file, e.g.: /pathto/cligen.nimble
+  result = ""
+  var parents = 0
+  block packageSearch:
+    for d in myParentDirs(path):
+      if conf.packageCache.hasKey(d):
+        #echo "from cache ", d, " |", packageCache[d], "|", path.splitFile.name
+        return conf.packageCache[d]
+      inc parents
+      for file in walkFiles(d / "*.nimble"):
+        result = file
+        break packageSearch
+  # we also store if we didn't find anything:
+  for d in myParentDirs(path):
+    #echo "set cache ", d, " |", result, "|", parents
+    conf.packageCache[d] = result
+    dec parents
+    if parents <= 0: break
+
+proc getPackageName*(conf: ConfigRef; path: string): string =
+  ## returns nimble package name, e.g.: `cligen`
+  let path = getNimbleFile(conf, path)
+  if path.len > 0:
+    return path.splitFile.name
+  else:
+    return "unknown"