help: apply the section headings from revsets to templates Unlike filesets, there are a few distinct headings that are not shared with revsets. But common names are used where possible.

help: apply the section headings from revsets to filesets This has the nice property of visually breaking up the wall of text. It also allows specific smaller sections to be called out. For example, `hg help filesets.predicates` now prints just the predicate section. At the moment, the revset headings are a superset of the fileset headings, so there is consistency in how example, predicate and operator help is called out. The reference to `hg help patterns` was moved to the overview section, so that it isn't stuck in the examples section.

chg: check type read from S channel The previous patch added the check server-side. This patch added it client-side.

chgserver: check type passed to S channel It currently only supports the "system" type. Add an explicit check.

chg: send type information via S channel (BC) Previously S channel is only used to send system commands. It will also be used to send pager commands. So add a type parameter. This breaks older chg clients. But chg and hg should always come from a single commit and be packed into a single package. Supporting running inconsistent versions of chg and hg seems to be unnecessarily complicated with little benefit. So just make the change and assume people won't use inconsistent chg with hg.

rebase: fail-fast the pull if working dir is not clean (BC) Refuse to run 'hg pull --rebase' if there are uncommitted changes: so that instead of going ahead with fetching changes and then suddenly aborting the rebase, we can warn user of uncommitted changes (or unclean repo state) right up front. In tests, we create a 'histedit' session to verify that also an unfinished state is detected and handled.

commit: fix unmodified message detection for the "--- >8 ----" magic We need the raw editortext to be compared with the templatetext.

commit: update test to actually modify template text We have a check for unmodified commit message (introduced by bec1a579ebc4), which should be enabled for the "--- >8 ---" magic but currently not.

pager: wrap ui._runpager As discussed at [1], ui._runpager will be the new low-level API accepting a pager command to actually run the pager. And ui.pager is the high-level API which reads config directly from self. This change is necessary for chgserver to override _runpager cleanly. [1]: www.mercurial-scm.org/pipermail/mercurial-devel/2016-December/091656.html

summary: use ui.label and join to write evolution troubles Follow-up on 7b526670f540 to avoid a convoluted loop.

log: drop unnecessary ui.note label from "trouble: " line Follow-up on f05ede08dcf7 and 6d0b1a69f98c.

revset: add a followlines(file, fromline, toline[, rev]) revset This revset returns the history of a range of lines (fromline, toline) of a file starting from `rev` or the current working directory. Added tests in test-annotate.t which already contains a reasonably complex repository.

context: add a `blockancestors(fctx, fromline, toline)` function This yields ancestors of `fctx` by only keeping changesets touching the file within specified linerange = (fromline, toline). Matching revisions are found by inspecting the result of `mdiff.allblocks()`, filtered by `mdiff.blocksinrange()`, to find out if there are blocks of type "!" within specified line range. If, at some iteration, an ancestor with an empty line range is encountered, the algorithm stops as it means that the considered block of lines actually has been introduced in the revision of this iteration. Otherwise, we finally yield the initial revision of the file as the block originates from it. When a merge changeset is encountered during ancestors lookup, we consider there's a diff in the current line range as long as there is a diff between the merge changeset and at least one of its parents (in the current line range).

mdiff: add a "blocksinrange" function to filter diff blocks by line range The function filters diff blocks as generated by mdiff.allblock function based on whether they are contained in a given line range based on the "b-side" of blocks.

run-tests: unset CHGDEBUG With CHGDEBUG, chg outputs much more stuff and the test could fail running with --chg. So unset the environment variable.

summary: add evolution "troubles" information to summary output Extend the "parent: " lines in summary with the list of evolution "troubles" in parentheses, when the parent is troubled.

summary: use the same labels as log command in "parent: " line Re-use the cmdutil._changesetlabels function introduced in 5289fd78017a to have consistent labels between the "changeset: " line in log command and the "parent: " line in summary.

templates: display evolution "troubles" in command line style

templatekw: add a "troubles" template keyword The "troubles" template keyword returns a list of evolution troubles. It is EXPERIMENTAL, as anything else related to changeset evolution. Test it in test-obsolete.t which has troubled changesets.

test: test "trouble: " line in log output with multiple troubles Follow-up on f05ede08dcf7.

cmdutil: add missing "i18n" comment about "trouble: " line Follow-up on f05ede08dcf7 per late review.

rebase: use repo.vfs.exists in 'hg summary' hook

hgweb: link to raw-file on annotation page (BC) Every other template has the "raw" link load "raw-file." However, fileannotate.tmpl's "raw" link loads "raw-annotate." This feels inconsistent and wrong. As far as I can tell, linking to the "raw annotate" view has occurred since 2006.

repair: combine two loops over changelog revisions This just saves a few lines.