Remove CLONE BufferSource; cache document sources in tmpdir

At last all BufferSources are unified.

To achieve the same effect as the previous CLONE source type, we now
use the "fromcache" flag in Request. This *forces* the document to be
streamed from the disk; if the file no longer exists for some reason,
an error is returned (i.e. the document is not re-downloaded).

For a document to be cached, it has to be the main document of the
buffer (i.e. no additional resources requested with fetch()), and
also not an x-htmloutput HTML file (for those, the original source is
saved). The result is that toggleSource now always returns the actual
source for e.g. markdown files, not the HTML-transformed version.

Also, it is now possible to view the source of a document that is
still being downloaded.

buffer.sstream has almost been eliminated; it still exists, but only as
a pseudo-buffer to interface with EncoderStream and DecoderStream. It no
longer holds the entire source of a buffer at any point, and is cleared
as soon as the buffer is completely loaded.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/loader/connecterror.nim b/src/loader/connecterror.nim
index 1b529128..08f7b436 100644
--- a/src/loader/connecterror.nim
+++ b/src/loader/connecterror.nim
@@ -1,4 +1,6 @@
 type ConnectErrorCode* = enum
+  ERROR_URL_NOT_IN_CACHE = (-16, "URL was not found in the cache")
+  ERROR_FILE_NOT_IN_CACHE = (-15, "file was not found in the cache")
   ERROR_FAILED_TO_EXECUTE_CGI_SCRIPT = (-14, "failed to execute CGI script")
   ERROR_CGI_NO_DATA = (-13, "CGI script returned no data")
   ERROR_CGI_MALFORMED_HEADER = (-12, "CGI script returned a malformed header")