largefiles: stylistic cleanup of filemerge

largefiles: show hashes before prompting for conflict resolution The largefile hashes are mostly an implementation detail, but they are "leaked" in several places anyway, and showing the hashes is better than not giving the user any information about the options in the prompt. The hashes are long, but it is largefile hashes and it would thus be confusing to shorten them.

largefiles: don't try to explain rename history before prompt for conflicts Before it tried to explain the exact situation when merging moved largefiles. That do not happen for normal merges and is not more relevant for largefiles than for normal files. It is unneeded complexity - remove it.

largefiles: drop redundant special handling of merges of renames It is unclear what cases this was supposed to cover but it do no longer seem relevant.

diff: search beyond ancestor when detecting renames This removes an optimization that was introduced in 91eb4512edd0 but was too aggressive - as indicated by how it changed test-mq-merge.t . We are walking filelogs to find copy sources and we can thus not be sure to hit the base revision and find the renamed file there - it could also be in the first ancestor of the base ... in the filelog. We are walking the filelog and can thus not easily know when we hit the first ancestor of the base revision and which filename to look for there. Instead, we use _findlimit like mergecopies do: The lower bound for how far we have to go is found from the lowest changelog revision that is an ancestor of only one of the compared revisions. Any filelog ancestor with a revision number lower than that revision will be the ancestor of both compared revisions, and there is thus no reason to go further back than that.

cat: increase perf when catting single files Special case the single file case in hg cat. This allows us to avoid parsing the manifest, which shaves 15% off hg cat perf. This is worth it, since automation often uses hg cat for retrieving single files.

changectx: increase perf of walk function When running 'hg cat -r . <file>' it was doing an expensive ctx.walk(m) which applied the regex to every file in the manifest. This changes changectx.walk to iterate over just the files in the regex, if no other patterns are specified. This cuts hg cat time by 50% in our repo and probably benefits a few other commands as well.

url: added authuri when login information is requested (issue3209) When users are using a revset they can get multiple password prompts. This prompts have no extra information about which password is being requested so I added the authuri to the prompt to make it recognizable. As in: $ hg log -r "outgoing('https://bitbucket.org/mg/test') - outgoing('https://bitbucket.org/nesneros/test')" http authorization required realm: Bitbucket.org HTTP user: interrupted! I changed it to describe the url when prompting for password. As in: $ hg log -r "outgoing('https://bitbucket.org/mg/test') - outgoing('https://bitbucket.org/nesneros/test')" http authorization required for https://bitbucket.org/mg/test realm: Bitbucket.org HTTP user: interrupted!

doc: add description about pattern matching against directories Before this patch, there is no explicit description about pattern matching against directories, even though users may understand it from "plain examples" in "hg help patterns". This patch adds description about pattern matching against directories.

revset: add explanation about the pattern without explicit kind Before this patch, online help of "adds()", "contains()", "filelog()", "file()", "modifies()" and "removes()" predicates doesn't explain about how the pattern without explicit kind like "glob:" is treated, even though each predicates treat it differently: - as "relpath:" by "adds()", "modifies()" and "removes()" - as "glob:" by "file()" - as special by "contains()" and "filelog()" - be relative to cwd, and - match against a file exactly ("relpath:" matches also against a directory) This may confuse users. This patch adds explanation about the pattern without explicit kind to these predicates.