histedit: don't allow to strip nodes which are necessary to continue histedit During histedit we don't want user to do any operation resulting in stripping nodes needed to continue history editing. This patch wraps the strip function to detect such situations.

subrepo: add tests for change/remove conflicts There are currently no tests for change/remove conflicts of subrepos, and it's pretty broken. Add some tests demonstrating some of the breakages and fix the most obvious one (a KeyError when trying to look up a subrepo in the wrong context).

hgweb: recreate old DOM structure for css in monoblue style There's a "p.changeset-age span" css block in style-monoblue.css with quite a bit of rules, including position. They were all unused, since there weren't matching span element inside the p.changeset-age. The span was removed in b24e5a708fad (as it seemed meaningless at the time?) and since then relative changeset age text looked weird and broken. "age" class is used for calculating relative changeset age in javascript: all content of such element is replaced with human-friendly text (e.g. "yesterday"). So the new span gets the age class.

shellquote: fix missing quotes for empty string "hg kdiff3 -rREV" did not work because 1642eb429536 and 5edb387158a1 failed to handle empty argument.

trydiff: transpose 'if opts.git or losedatafn' with 'if f[12]' Perhaps it's more readable this way...

trydiff: extract function that generates filename pairs The code that identifies copies/renames, as well as the filenames before and after, is now isolated and we can extract it to a function so it can be overridden by extensions (in particular the narrow clone extension).

trydiff: read file data in only one place This moves getfilectx() out of the initial block in the loop, leaving that block to be only about finding pairs of filenames in ctx1 and ctx2 to diff.

trydiff: set filename variables to None even when not opts.git or losedatafn There is not much left of the first block "if opts.git or losedatafn" block now. The next patch will move the call to getfilectx() out of that block. We will then be using the defined-ness of 'f1' to tell whether the file existed in ctx1 (and under what name). We will need this information whether or not opts.git or losedatafn was set, so just remove that guard. The only operation in the block that is not cheap is the call to getfilectx(), but that has an extra 'if opts.git' guard already. --ignore-space-change proves that only 'if opts.git or losedatafn:' was removed.

trydiff: read flags in one place Now that we can trust f1/f2 to indicate whether that side of the diff exists, we can move the calls to ctx.flag() to a single place.

trydiff: break 'if opts.git or losedatafn' into two This moves the initialization 'binary' closer to its other assignment, but exists mostly to simplify future patches.

trydiff: make filenames None when they don't exist f1 and f2 are currently set always set to some filename, even for added or deleted files. Let's instead set them to None to indicate that one side of the diff doesn't exist. This lets us use the filename variables instead of the content variables and simplify a bit since the empty string is not a valid filename. More importantly, it paves the way for further simplifications.

test-help: add test to demonstrate that 'hg help merge-tools' is sane

help.merge-tools: do not double document merge tools Merge tools were being double documented in help system output due to functions being defined under multiple names in the merge tools dictionary. Establish a new dictionary for just the tools to document and use it from the help system so we don't get double output. Double documentation likely plagues other auto-documented items as well. It might be a good idea to eventually compare function instances to filter out duplicate entries from dictionaries passed to ``makeitemsdoc``. However, without an easy way to break ties, this may result in some functions being advertised over their modern equivalents. This would be a noble patch series. But it isn't one this author is willing to tackle at this time.

help: teach topic symbols how to dedent When using docstrings for documenting symbols such as revsets, templates, or hgweb commands, documentation likely has leading whitespace corresponding to the indentation from the Python source file. Up until this point, the help system stripped all leading and trailing whitespace and replaced it with 2 spaces of leading whitespace. There were a few bad side-effects. First, sections could not be used in docstrings because they would be indented and the rst parser would fail to parse them as sections. Also, any rst elements that required indentation would lose their indentation, again causing them to be parsed and rendered incorrectly. In this patch, we teach the topic symbols system how to dedent text properly. I argue this mode should be enabled by default. However, I stopped short of changing that because it would cause a lot of documentation reformatting to occur. I'm not sure if people are relying on or wanting indentation. So, dedenting has only been turned on for hgweb symbols. This decision should be scrutinized.

webcommands: document "graph" web command

webcommands: document "archive" web command

webcommands: document "filelog" web command

webcommands: document "annotate" web command

webcommands: document "comparison" web command

webcommands: document "filediff" web command

webcommands: document "summary" web command

webcommands: document "manifest" web command

webcommands: document "changelog" web command

webcommands: document "file" web command

webcommands: document "log" web command

webcommands: document "shortlog" web command

webcommands: document "changeset" web command

webcommands: document "tags" web command

webcommands: document "bookmarks" web command

webcommands: document "branches" web command

webcommands: document "help" web command

help: add web commands to help documentation The capabilities and URL endpoints of the hgweb server can currently only be inferred by looking at links in `hg serve` output or by reading the source code. I've frequently found myself wanting to quickly see what URLs and capabilities are available. This patch teaches the help system how to display information about web commands and their URLs. Using a mechanism similar to revsets, templates, etc, we can now iterate over the docstrings of registered web command functions and display them in the help output. Unfortunately, web commands don't currently have docstrings, so the output is currently empty. This will be addressed in the following patches. I apologize for the patch bomb.

help.hgweb: add a section describing URLs and common parameters The behavior of hgweb's URLs isn't documented anywhere inside Mercurial. Let's start to change that.

webcommands: move help import into help command handler A subsequent patch will introduce an import cycle between mercurial.help and mercurial.hgweb.webcommands. Break the cycle by moving the import of mercurial.help into the web command that actually needs it.

webcommands: define a dict of available commands This will be used to hook web commands up to the help system. It also makes web commands work similarly as CLI commands.

webcommands: define web commands using a decorator Other parts of Mercurial have evolved to use decorators to declare commands or handlers. This patch gives the same treatment to web commands.

run-tests: ensure install directories exist As part of the transition to setuptools, it was discovered that setuptools doesn't create install directories for you where distutils apparently did. This was causing run-tests.py to fail when creating the temporary hg install. We work around this problem by creating the install directories before running setup.py.

run-tests: avoid printing extra newlines from install log If an installation error occurs, we print the install log. Before, output had extra newlines because we were using "print" on data that was already newline terminated.

bundlerepo: basic bundle2 support For bundlerepo to work with bundle2 files, we need to find the part that contains the bundle's changegroup data and work with that instead of the entire bundle. Future work can add separate processing for other bundle2 parts.

bundlerepo: keep track of the original bundle object Bundlerepo should always close() the object that it receives from exchange.readbundle(). When bundle2 support is added in a later diff, self.bundle will be overwritten to be the changegroup part instead of the entire bundle unpacker.

bundle2.unbundle20: add compressed() method Bundlerepo uses the compressed() method to determine whether it should write an uncompressed temporary file. Since we don't support compressed bundle2 files at the moment, make this method return true.

bundle2.unpackermixin: default value for seek() whence parameter The contract for seek() includes seeking to an offset from the beginning of the file when whence is omitted; put this implementation in compliance.

windows: adjust doc string and comments of posixfile() The doc string of osutil.posixfile includes (line 611): "On error, this function may raise either a WindowsError or an IOError." which is most likely correct, but does not fit for this function here anymore, as we do fold WindowsError to IOError here specifically. And this function is now a bit more than just an exception-wrapper, as it has been expanded to additionally sanitize the unloved seek/tell behavior of Windows. (Self-disclosure: This patch is entirely untested at the time of its publication, as I'm currently not using this version myself. I send it in hopes that it will reduce potential future confusion. CC-ing Matt Harbison)

color: support a different color mode when the pager is active MSYS on Windows has a terminal that supports the "win32" color mode (which "auto" properly detects for us). However, a popularily configured pager in that environment (GNU less) only supports the "ansi" color mode. This patch teaches color about a new config option: pagermode. It behaves like "mode" but is only consulted when the pager is active for the current command. MSYS users can now set "pagermode = ansi" and get a colorful experience that just works. Previously, MSYS users would have to live without color when using GNU less as the pager, would have to manually configure the pager to attend every command, or would have gibberish if "ansi" was used without the pager.

pager: ensure wrapped dispatch._runcommand runs before color's An upcoming patch will teach color to potentially act differently if the pager is active. Since both extensions wrap the same function (dispatch._runcommand) to change behavior, we must guarantee that pager's wrapped function runs before color's so color may read the breadcrumb left by pager.

pager: set an attribute on ui indicating that a pager is active A subsequent patch will teach the color extension to do different things depending on whether a pager is active. This patch leaves a breadcrumb on the ui instance to allow it do that that.

extensions: support callbacks after another extension loads An upcoming patch will introduce a dependency between the color and pager extensions. To prepare for this, we teach extensions how to register callbacks that can execute when another extension loads. This patch is based on code provided by Matt Mackall. But significant parts have changed (such as the ability to register multiple callbacks and the change in behavior to always call a callback). I believe that always firing the callback is a good practice. I think the common use for this feature will be for extensions to say "run this one-time setup code, after this other extension if possible." Always running the callback will facilitate this.

log: fix --follow null parent not to include revision 0 If p1 is null, ':.' is translated as '0:null'. But rangeset can't handle null, only revision 0 was visible. Because 'null' should not be listed implicitly, "log --follow" (without -r) should be empty if p1 is null. Test of "hg grep -f" is added for cmdutil.walkchangerevs().

cmdutil: have walkchangerevs utilize common function to build revs

log: extract common part from getgraphlogrevs() and getlogrevs()

graphlog: remove useless check for empty repo when --follow is specified This prepares for extracting common part from getgraphlogrevs() and getlogrevs(). getlogrevs() does not handle empty repo specially. When it was added at d74099ac2ac1, revs were build by old-style query, '.:0'. So I think the purpose of "len(repo) > 0" was to handle the case of . = null. Currently it isn't necessary for 'reverse(:.)', and it does not work if repo is not empty but p1 is null. $ hg up null $ hg glog --follow -T '{rev}:{node|short}\n' o 0:0a04b987be5a The subsequent patch will fix this problem, so drops the wrong version for now.

graphlog: move comment and flag denoting revs might be unsorted This prepares for extracting common part from getgraphlogrevs() and getlogrevs(). "possiblyunsorted" exists only in getgraphlogrevs().

graphlog: remove too early return from getgraphlogrevs() for empty repo Even if repository is empty, null revision should exist.

trydiff: call util.binary in only one place It's practically free to call util.binary on empty or None content. By relying on that, we can replace the current four call sites by one.

trydiff: collect all lossiness checks in one place By having all the checks for lossiness in one place, it becomes much easier to get an overview of the conditions that lead to losedatafn() being called. It also makes it obvious that it can not be called multiple times for a single time (something that was rather tricky to determine before).

trydiff: replace 'binarydiff' variable by 'binary' variable It's not obvious, but every path in the 'if opts.git or losedatafn:' block will have checked whether the file is binary [1]. Let's assign the result of this check to a variable so we can simplify by checking 'binary and opts.git' in only one place instead of every place we currently assign to 'binarydiff'. [1] Except when deleting an empty file, but checking whether an empty string is binary is very cheap anyway.

trydiff: rename 'op' to make it more specific Rename the 'op' variable that can take values None/'copy'/'rename' to 'copyop' to make it a little more specific.

hgweb: replace implicit <tbody> with explicit <thead> where appropriate Some templates in paper style use <tbody> elements inside <table> to assign a class to "body" part of that table (in this case, to make rows striped). The problem is that the <tbody> is preceded by <tr> element, which browsers understand as an implicit start of table body, so the following exlicit <tbody> will actually be "nested", which is not valid. Since that first <tr> contains table headers, wrapping it in <thead> is both semantically correct and follows the advertised XHTML 1.1 doctype.

obsolete: drop the explicit seek to EOF after append mode open() posixfile now handles this.

branchmap: backout 6bf93440a717 This is no longer needed now that posixfile handles seeking to EOF when it opens a file in append mode.

windows: seek to the end of posixfile when opening in append mode The position is implementation defined when opening in append mode, and it seems like Linux sets it to EOF while Windows keeps it at zero. This has caused problems in the past when a file is opened and tell() is immediately called, such as 48c232873a54 and 6bf93440a717. Since the only caller of osutil.posixfile is this windows module, this seems like a better place to fix the issue than in osutil.c and pure.osutil.

context: use unfiltered repo for '.' There is no reason to read obsolescence markers when doing a plain 'hg status' without --rev. Use the unfiltered repo when initializing context._rev to speed things up. This speeds up 'hg status' from 1.342s to 0.080s on my repo with ~110k markers.

check-commit: check capitalization in summary lines At the moment, check-commit will complain about the topic being capitalized, but not the summary that comes after it. This diff corrects that deficiency.

bundle2: seek in part iterator When iterating over bundle2 parts, add a seek to the iterator so that processing will continue normally even if the entire part isn't consumed.

bundle2: now that we have a seek implementation, use it Replace bare part.read() calls with part.seek(0, 2) since the return value is being ignored. As this doesn't necessarily require building a string that contains the rest of the part, the potential exists to reduce the memory footprint of these operations.

obsolete: populate successors, precursors, children lazily The precursors and children dictionaries are not used by many commands. By making them lazily populated, 'hg log -r @~10::@ >/dev/null' is sped up from 0.564s to 0.440s on my hg.hg repo with 73k markers. Also make successors lazily populated, mostly for consistency with the others.

obsolete: pass only new markers to _checkinvalidmarkers() We will soon delay populating precursors until we have to. To prepare for that, make _checkinvalidmarkers() scan for a nullid precursor in the list of new markers instead of the (currently) cheaper 'if nullid in precursors' check.

obsolete: extract helpers from _load() In preparation for making the successors, precursors, and children dictionaries lazily populated, break up _load() into one function for adding markers to each dictionary.

test-gendoc: require gettext If the gettext utilities aren't installed, there is no way to make the translations. This causes the gettext client to fall back to the untranslated message, which triggers "** NOTHING TRANSLATED **" errors and a test failure.

hgweb: use css margin instead of empty <p> before diffstat table The <p> elements were used to create an empty space between the diffstat link and the diffstat table, but they don't have any semantic meaning, so it is better to use css instead. Default margins for <p> elements can differ depending on the browser, but usually the margin is 1em (exceptions are IE 6 and 7 with 14pt, which is comparable). The css rule sets top margin to 1em. This change is a "better version" of 70cfa7e1611b, where <p> elements were simply properly closed.

hgweb: use css margin instead of empty <p> before <div class="atom-logo"> The <p> elements were used to create an empty space between the last menu item (i.e. "help") and the atom feed icon, but they don't have any semantic meaning, so it is better to use css instead. The css rule uses top margin of 10px, which is equal to the top margin of the menu blocks ("help", "changeset, browse", etc). Previously, with <p> elements, the margin wasn't set explicitly and was browser-dependent. This change is a "better version" of 70cfa7e1611b, where <p> elements were simply properly closed.

error: update docstring on ParseError It's now used by revsets and filesets.

dispatch: consolidate formatting of ParseErrors

error: store filename and message on LookupError for later It may be useful to be able to get to the failed path and the underlying error message when catching a LookupError, so let's make them accessible.

bundle2.unbundlepart: implement seek() This implements a seek() method for unbundlepart. This allows on-disk bundle2 parts to behave enough like files for bundlerepo to handle them. A future patch will add support for bundlerepo to read the bundle2 files that are written when the experimental.strip-bundle2-version config option is used.

bundle2.unbundlepart: tell() implementation Keep track of how many bytes we've returned from read(); fairly straightforward.

bundle2.unbundlepart: keep an index of chunks and their locations In order to make unbundlepart seekable, we need to keep a record of where the chunks are so that we can go back to the correct point.

bundle2.unbundlepart: raise payloadchunks from a closure to a method In a future patch, seek() will need to make a new chunk iterator for the stream; this places it somewhere it can be called multiple times.

manifest: make lru size configurable On machines with lots of ram, it's beneficial to increase the lru size of the manifest cache. On a large repo, configuring the lru to be size 10 can shave a large rebase (~12 commits) down from 95s to 70s.

parsers: use k instead of n for PyArg_ParseTuple because python 2.4 is awful

revset: have rev() validate input by repo.changelog.__contains__() fullreposet.__contains__() will be rewritten in order to support "null" revision, and "rev()" won't be possible to rely on it. This backs out eb763217152a, but there is no performance regression now. revisions: 0) e1dbe0b215ae "l not in fullreposet(repo)" 1) this patch "l not in repo.changelog" revset #0: rev(210000) 0) wall 0.000056 comb 0.000000 user 0.000000 sys 0.000000 (best of 48036) 1) wall 0.000049 comb 0.000000 user 0.000000 sys 0.000000 (best of 54969)

revlog: add __contains__ for fast membership test Because revlog implements __iter__, "rev in revlog" works but does silly O(n) lookup unexpectedly. So it seems good to add fast version of __contains__. This allows "rev in repo.changelog" in the next patch.

largefiles: set the extension as enabled locally after a clone requiring it When cloning a repo that requires largefiles, the user had to either enable the extension on the command line and then manually edit the local hgrc file after the clone, or just enable it globally for the user. Since it is a feature of last resort, and materially affects even repos without any largefiles when it is enabled, we should make it easier to not have it enabled globally. This simply adds the enabling statement to the local hgrc if the requires file mandates its use (which only happens after the first largefile is committed). That means that a user who works with a mix of largefile and normal repos can always clone with '--config extensions.largefiles=', and the extension is permanently enabled or not as appropriate. The change in test-largefiles.t is simply because the order of loading rebase and largefiles changed. The same change occurs if the order is flipped in the hgrc file at the top of the test.

color: be more conservative about setting ANSI mode on Windows (BC) The current color mode detection on Windows assumes the presence of the TERM environment variable assumes ANSI is supported. However, this isn't always true. In MSYS (commonly found as part of MinGW), TERM is set to "cygwin" and the auto resolved color mode of "ansi" results in escape sequences getting printed literally to the terminal. The output is very difficult to read and results in a bad user experience. A workaround is to activate the pager and have it attend all commands (GNU less in MSYS can render ANSI terminal sequences properly). In Cygwin, TERM is set to "xterm." Furthermore, Cygwin supports displaying these terminal sequences properly (unlike MSYS). This patch changes the mode auto-detection logic on Windows to be more conservative about selecting the "ansi" mode. We now only select the "ansi" mode if TERM is set and it contains the string "xterm" or if we were unable to talk to win32 APIs to determine the settings. There is a chance this may take away "ansi" from a terminal that actually supports it. The recourse for this would be to patch the detection to act appropriately and to override color.mode until that patch has landed. However, the author believes this regression is tolerable, since it means MSYS users won't have gibberish printed by default. Since MSYS's common pager (less) supports display of ANSI sequences, there is room to patch the color extensions so it can select the ANSI color mode if a pager is activated. Mozilla (being an active user of MSYS) would really appreciate this being part of the stable branch. However, since I believe it is BC, I haven't explicitly requested application to stable since I figure that request will be denied.

merge with stable

bundle2.unpackermixin: control for underlying file descriptor This patch adds seek(), tell(), and close() implementations for unpackermixin which forward to the file descriptor's implementation if possible. A future patch will use this to make bundle2.unbundlepart seekable, which will in turn make it usable as a file descriptor for bundlerepo.

trydiff: join elements in 'header' list by '\n' It seems natural that each element in the list corresponds to one line of output. That is currently true, but only because each element in the list has a trailing newline. Let's drop those newlines and instead add them when we print the headers.

trydiff: move check for quietness out of diffline() By moving the condition out of diffline(), the call site becomes clearer and diffline() no longer closes on any variables. Note that this changes the value of the header variable from [''] to [], but there is no difference in how these two are treated by the following code. The new value seems more natural anyway.

trydiff: remove dead branch in diffline() Since diffline() is never called when 'revs' is empty, it doesn't need to handle that case.

trydiff: make 'revs' ignored if opts.git is set Instead of setting revs=None to prevent the call to diffline() when opts.git is set, explicitly do not call the function in the git case.

trydiff: remove unused argument to diffline() Now that diffline no longer knows about copies/renames, it only needs one argument for the path.

trydiff: move git-header code out of diffline function This collects more of the code for writing git headers in a single place and makes diffline() close on a few variables less.

_fm1readmarkers: generate list in C This moves perfloadmarkers from ! result: 63866 ! wall 0.239217 comb 0.250000 user 0.240000 sys 0.010000 (best of 42) to ! result: 63866 ! wall 0.218795 comb 0.210000 user 0.210000 sys 0.000000 (best of 46)

obsolete: use parsers.fm1readmarker if it exists for a ~38% perf win This moves perfloadmarkers on my linux workstation (63494 markers from mpm, crew, and myself) performance from ! wall 0.357657 comb 0.360000 user 0.350000 sys 0.010000 (best of 28) to ! wall 0.222345 comb 0.220000 user 0.210000 sys 0.010000 (best of 41) which is a pretty good improvement. On my BSD machine, which is ancient and slow, before: ! wall 3.584964 comb 3.578125 user 3.539062 sys 0.039062 (best of 3) after: ! wall 2.267974 comb 2.265625 user 2.195312 sys 0.070312 (best of 5) I feel like we could do better by moving the whole generator function into C, but I didn't want to tackle that right away.

parsers: add fm1readmarker This lets us do most of the interesting work of parsing obsolete markers in C, which should provide significant time savings. Thanks to Martin von Zweigbergk for some cleanups on this code.

util: add getbefloat64 As far as I can tell, this is wrong. double's format isn't strictly specified in the C standard, but the wikipedia article implies that platforms implementing optional Annex F "IEC 60559 floating-point arithmetic" will work correctly. My local C experts believe doing *((double *) &t) is a strict aliasing violation, and that using a union is also one. Doing memcpy appears to be the least-undefined behavior possible.

util: add getbe{u,}int16 utility methods

obsolete: make optional offset parameter to fm*readmarkers required It was always passed by the only callsite, so just make it required.

log: fix json-formatted output when file copies are listed (issue4523)

merge with stable

copy: move _forwardcopies file logic to a function Moves the _forwardcopies missingfiles logic to a separate function so that other extensions which need to prefetch information about the files being processed have a hook point. This saves extensions from having to recompute this information themselves, and thus saves several seconds off of various commands (like rebase).

copy: move mergecopies file logic to a function Moves the mergecopies nonoverlap logic to a separate function so that other extensions which may need to prefetch information about the files being processed have a hook point. This saves extensions from having to recompute this information themselves, and thus saves several seconds off of various commands (like rebase).

histedit: allow configuring default behavior Adds a configuration setting for allowing users to specify the default behavior of 'hg histedit' without arguments. This saves users from having to manually figure out the bottom commit or a complicated revset. My current revset of choice is "only(.) & draft() - ::merge()" The commits that histedit can work with is usually quite limited, so if this feature ends up working well, we may want to consider making "only(.) & draft() - ::merge()" the default behavior for everyone.

revset: get revision number of each node from target namespaces Before this patch, revset predicate "named()" uses each nodes gotten from target namespaces directly. This causes problems below: - combination of other predicates doesn't work correctly, because they assume that revisions are listed up in number - "hg log" doesn't show any revisions for "named()" result, because: - "changeset_printer" stores formatted output for each revisions into dict with revision number (= ctx.rev()) as a key of them - "changeset_printer.flush(rev)" writes stored output for the specified revision, but - "commands.log" invokes it with the node, gotten from "named()" - "hg debugrevspec" shows nodes (= may be binary) directly Difference between revset predicate "tag()" and "named('tags')" in tests is fixed in subsequent patch.

largefiles: update _subdirlfs() comment http://www.selenic.com/pipermail/mercurial-devel/2015-February/065958.html

largefiles: use the core file copy logic to validate the destination path The destination is validated by pathutil.canonpath() for illegal components, and that it is in the repository. The logic for creating the standin directory tree was calling this before cmdutil.copy(), but without the destination file name component. The cmdutil.copy() logic also calls pathutil.canonpath(), but with the file name component. By always calling the core logic first, the error message is always consistent. Specifically, the old behavior for these tests was to say '.hg' contains an illegal component, and '..' is not under root. A user wasn't likely to notice the discrepancy, but this eliminates a needless difference when running the test suite with --config extensions.largefiles=.

trydiff: inline indexmeta() The function is trivial and is only called in one place.

parsers: rewrite index_ancestors() in terms of index_commonancestorsheads() The first 80% of index_ancestors() is identical to index_commonancestorsheads(), so just call that function instead.

filelog: remove unused _file method

histedit: store full node hash in rules Previously histedit only stored the short version of the rule nodes in the state. This meant that later we couldn't resolve a rule node to its full form if the commit had been deleted from the repo. Let's store the full form from the beginning.

trydiff: order header-writing code in same order as output Instead of inserting a line before the others header lines, move the code that writes that line before the code that writes the other lines.

trydiff: inline sole addmodehdr() call Now that there is only a single call to addmodehdr() left, and there is other similar code (for new/deleted files) around that call site, let's inline the function there. That also makes it clearer under what circumstances the header is actually written (when modes differ).

trydiff: join filename with prefix only once

trydiff: collect header-writing in one place This is the first step towards simplifying the big loop in trydiff(). This will make both the header code and the non-header code clearer, and it prepares for further simplification of the many nested if-statements in the body of the loop.

trydiff: make variable names more consistent Use '1' and '2' as suffix for names just like in the parameters 'ctx[12]': to,tn -> content1,content2 a,b -> f1, f2 omode,mode -> mode1,mode2 omode,nmode -> mode1,mode2 onode,nnode -> node1,node2 oflag,nflag -> flag1,flag2 oindex,nindex -> index1,index2

trydiff: check only if added file is a copy target, not source When creating a diff with copy/rename enabled, we consider added files and check if they are either copy sources or targets. However, an added file should never be a copy source. The test suite seems to agree with this: all tests pass if we raise an exception when an added file is a copy source. So, let's simplify the code by dropping the conditions that are never true. For those interested in the historical reasons: Before commit d1f209bb9564 (patch: separate reverse copy data (issue1959), 2010-02-11), 'copy' seems to have been a bidirectional map. Then that commit split it up into two unidirectional maps and duplicated the logic to look in both maps. It was still needed at that point to look in both maps, as the copy detection was poor and could sometimes be reported in reverse. A little later came 91eb4512edd0 (copies: rewrite copy detection for non-merge users, 2012-01-04). That commit fixed the copy detection to be backwards when it should, and made the hacks in trydiff unnecessary.

trydiff: remove unused variable 'modifiedset' We started updating 'modifiedset' in a9853fc172d2 (trydiff: simplify checking for additions, 2014-12-23) but in the same commit, we removed the last use of the variable. Clean it up.

revset: replace parsing alias definition by _parsealiasdefn to parse strictly Before this patch, referring alias arguments is parsed by string base operation "str.replace". This causes problems below (see the previous patch introducing "_parsealiasdefn" for detail) - the shorter name argument breaks referring the longer name - argument names in the quoted string are broken This patch replaces parsing alias definition by "_parsealiasdefn" to parse strictly.

revset: introduce _parsealiasdefn to parse alias definitions strictly This patch introduces "_parsealiasdefn" to parse alias definitions strictly. For example, it can avoid problems below, which current implementation can't. - the shorter name argument breaks referring the longer name one in the definition, if the former is completely prefix of the latter for example, the alias definition "foo($1, $10) = $1 or $10" is parsed as "_aliasarg('$1') or _aliasarg('$1')0" and causes parse error, because tail "0" of "_aliasarg('$1')0" is invalid. - argument names in the quoted string are broken for example, the definition "foo($1) = $1 or desc('$1')" is parsed as "_aliasarg('$1') or desc('_aliasarg(\'$1\')')" and causes unexpected description matching against not '$1' but '_aliasarg(\'$1\')'. To decrease complication of patch, current implementation for alias definitions is replaced by "_parsealiasdefn" in the subsequent patch. This patch just introduces it. This patch defines "_parsealiasdefn" not as a method of "revsetalias" class but as a one of "revset" module, because of ease of testing by doctest.

hgweb: use revset.spanset where appropriate It is remainder of 9ad6dae67845 where spanset was introduced.