Revert relativePath

nimterop/git.nim

@@ -50,43 +50,14 @@ proc mvFile*(source, dest: string) =
   cpFile(source, dest, move=true)
 
 when (NimMajor, NimMinor, NimPatch) < (0, 19, 9):
-  proc relativePath*(path, base: string; sep = DirSep): string =
-    ## Copied from `os.relativePath` ; remove after nim >= 0.19.9
-    if path.len == 0: return ""
-    var f, b: PathIter
-    var ff = (0, -1)
-    var bb = (0, -1) # (int, int)
-    result = newStringOfCap(path.len)
-    while f.hasNext(path) and b.hasNext(base):
-      ff = next(f, path)
-      bb = next(b, base)
-      let diff = ff[1] - ff[0]
-      if diff != bb[1] - bb[0]: break
-      var same = true
-      for i in 0..diff:
-        if path[i + ff[0]] !=? base[i + bb[0]]:
-          same = false
-          break
-      if not same: break
-      ff = (0, -1)
-      bb = (0, -1)
-
-    while true:
-      if bb[1] >= bb[0]:
-        if result.len > 0 and result[^1] != sep:
-          result.add sep
-        result.add ".."
-      if not b.hasNext(base): break
-      bb = b.next(base)
-
-    while true:
-      if ff[1] >= ff[0]:
-        if result.len > 0 and result[^1] != sep:
-          result.add sep
-        for i in 0..ff[1] - ff[0]:
-          result.add path[i + ff[0]]
-      if not f.hasNext(path): break
-      ff = f.next(path)
+  proc relativePath*(file, base: string): string =
+    ## naive version of `os.relativePath` ; remove after nim >= 0.19.9
+    runnableExamples:
+      doAssert "/foo/bar/baz/log.txt".relativePath("/foo/bar") == "baz/log.txt"
+    var base = base
+    if not base.endsWith "/": base.add "/"
+    doAssert file.startsWith base
+    result = file[base.len .. ^1]
 
 proc extractZip*(zipfile, outdir: string) =
   var cmd = "unzip -o $#"