templater: use template context to render old-style list template Prepares for dropping the 'templ' resource. This means old-style list templates are processed by the same engine class as the one for the list node. I think that's fine since templates for the same list should be tightly coupled, and I believe the extension point for the engine classes isn't actually used. Now templatekw._showlist() is a compatibility wrapper for _showcompatlist(), and will be deprecated soon. The function is still marked as private since I plan to change the interface to get rid of closures capturing context and mapping.

templater: add context.preload(t) to test if the specified template exists I'm going to remove 'templ' from the resources dict because it is the only resource that the caller can't provide. This also implies that putting 'templ' into the resources dict creates a reference cycle. context.preload(t) will be used in place of templater.__contains__().

annotate: pack line content into annotateline object (API) Just for code readability. We can do that since the annotateline type is no longer used while computing the history.

annotate: drop linenumber flag from fctx.annotate() (API) Now linenumber=True is fast enough to be enabled by default.

annotate: do not construct attr.s object per line while computing history Unfortunately, good abstraction has a cost. It's way slower to construct an annotateline() object than creating a plain tuple or a list. This patch changes the internal data structure from row-based to columnar, so the decorate() function can be instant (i.e. no Python in hot loop.) For code readability, the outermost tuple is switched to an attr.s object instead. (original, row-based attr.s) $ hg annot mercurial/commands.py --time > /dev/null time: real 11.470 secs (user 11.400+0.000 sys 0.070+0.000) $ hg annot mercurial/commands.py --time --line-number > /dev/null time: real 39.590 secs (user 39.500+0.000 sys 0.080+0.000) (this patch, columnar) $ hg annot mercurial/commands.py --time > /dev/null time: real 11.780 secs (user 11.710+0.000 sys 0.070+0.000) $ hg annot mercurial/commands.py --time --line-number > /dev/null time: real 12.240 secs (user 12.170+0.000 sys 0.090+0.000) (cf. 4.3.3, row-based tuple) $ hg annot mercurial/commands.py --time --line-number > /dev/null time: real 19.540 secs (user 19.460+0.000 sys 0.080+0.000)

wireproto: explicitly track which requests are active We previously only tracked which requests are receiving. A misbehaving client could accidentally have multiple requests with the same ID in flight. We now explicitly track which request IDs are currently active. We make it illegal to receive a frame associated with a request ID that has already been dispatched. Differential Revision: https://phab.mercurial-scm.org/D2901

wireproto: use named arguments when passing around frame data Named arguments is easier to reason about compared to positional arguments. Especially when you have many positional arguments. Differential Revision: https://phab.mercurial-scm.org/D2900

wireproto: define attr-based classes for representing frames When frames only had 3 attributes, it was reasonable to represent them as a tuple. With them growing more attributes, it will be easier to pass them around as a more formal type. So let's define attr-based classes to represent frame headers and full frames. Differential Revision: https://phab.mercurial-scm.org/D2899

wireproto: define human output side channel frame Currently, the SSH protocol delivers output tailored for people over the stderr file descriptor. The HTTP protocol doesn't have this file descriptor (because it only has an input and output pipe). So it encodes textual output intended for humans within the protocol responses. So response types have a facility for capturing output to be printed to users. Some don't. And sometimes the implementation of how that output is conveyed is super hacky. On top of that, bundle2 has an "output" part that is used to store output that should be printed when this part is encountered. bundle2 also has the concept of "interrupt" chunks, which can be used to signal that the regular bundle2 stream is to be preempted by an out-of-band part that should be processed immediately. This "interrupt" part can be an "output" part and can be used to print data on the receiver. The status quo is inconsistent and insane. We can do better. This commit introduces a dedicated frame type on the frame-based protocol for denoting textual data that should be printed on the receiver. This frame type effectively constitutes a side-channel by which textual data can be printed on the receiver without interfering with other in-progress transmissions, such as the transmission of command responses. But wait - there's more! Previous implementations that transferred textual data basically instructed the client to "print these bytes." This suffered from a few problems. First, the text data that was transmitted and eventually printed originated from a server with a specic i18n configuration. This meant that clients would see text using whatever the i18n settings were on the server. Someone in France could connect to a server in Japan and see unlegible Japanese glyphs - or maybe even mojibake. Second, the normalization of all text data originated on servers resulted in the loss of the ability to apply formatting to that data. Local Mercurial clients can apply specific formatting settings to individual atoms of text. For example, a revision can be colored differently from a commit message. With data over the wire, the potential for this rich formatting was lost. The best you could do (without parsing the text to be printed), was apply a universal label to it and e.g. color it specially. The new mechanism for instructing the peer to print data does not have these limitations. Frames instructing the peer to print text are composed of a formatting string plus arguments. In other words, receivers can plug the formatting string into the i18n database to see if a local translation is available. In addition, each atom being instructed to print has a series of "labels" associated with it. These labels can be mapped to the Mercurial UI's labels so locally configured coloring, styling, etc settings can be applied. What this all means is that textual messages originating on servers can be localized on the client and richly formatted, all while respecting the client's settings. This is slightly more complicated than "print these bytes." But it is vastly more user friendly. FWIW, I'm not aware of other protocols that attempt to encode i18n and textual styling in this manner. You could lobby the claim that this feature is over-engineered. However, if I were to sit in the shoes of a non-English speaker learning how to use version control, I think I would *love* this feature because it would enable me to see richly formatted text in my chosen locale. Anyway, we only implement support for encoding frames of this type and basic tests for that encoding. We'll still need to hook up the server and its ui instance to emit these frames. I recognize this feature may be a bit more controversial than other aspects of the wire protocol because it is a bit "radical." So I'd figured I'd start small to test the waters and see if others feel this feature is worthwhile. Differential Revision: https://phab.mercurial-scm.org/D2872

wireproto: service multiple command requests per HTTP request Now that our new frame-based protocol server can understand how to ingest multiple, possibly interleaved, command requests, let's hook it up to the HTTP server. The code on the HTTP side of things is still a bit hacky. We need a bit of work around error handling, content types, etc. But it's a start. Among the added tests, we demonstrate that a client can send frames for multiple commands iterleaved with each other and that a later issued command can respond before the first one has finished sending. This makes our multi-request model technically superior to the previous "batch" command. Differential Revision: https://phab.mercurial-scm.org/D2871