Use separate background colors for pure removal, pure addition and
change for side-by-side diff.  This makes reading such diff easier,
allowing to easily distinguish empty lines in diff from vertical
whitespace used to align chunk blocks.

Note that if lines in diff were numbered, the absence of line numbers
[for one side] would help in distinguishing empty lines from vertical
align.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

This commits adds to support for showing "side-by-side" style diff.
Currently you have to hand-craft the URL; navigation for selecting
diff style is to be added in the next commit.

The diff output in unified format from "git diff-tree" is reorganized to
side-by-side style chunk by chunk with format_sidebyside_diff_chunk().
This reorganization requires knowledge about diff line classification,
so format_diff_line() was renamed to process_diff_line(), and changed to
return tuple (list) consisting of class of diff line and of
HTML-formatted (but not wrapped in <div class="diff ...">...</div>) diff
line.  Wrapping is now done by caller, i.e. git_patchset_body().

Gitweb uses float+margin CSS-based layout for "side by side" diff.

You can specify style of diff with "ds" ('diff_style') query
parameter.  Currently supported values are 'inline' and 'sidebyside';
the default is 'inline'.

Another solution would be to use "opt" ('extra_options') for that...
though current use of it in gitweb seems to suggest that "opt" is more
about passing extra options to underlying git commands, and "git diff"
doesn't support '--side-by-side' like GNU diff does, (yet?).

Signed-off-by: Kato Kazuyoshi <kato.kazuyoshi@gmail.com>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

* ps/gitweb-js-with-lineno:
  gitweb: Fix links to lines in blobs when javascript-actions are enabled

The fixLinks() function adds 'js=1' to each link that does not already
have 'js' query parameter specified. This is used to signal to gitweb
that the browser can actually do javascript when these links are used.

There are two problems with the existing code:

  1. URIs with fragment and 'js' query parameter, like e.g.

        ...foo?js=0#l199

     were not recognized as having 'js' query parameter already.

  2. The 'js' query parameter, in the form of either '?js=1' or ';js=1'
     was appended at the end of URI, even if it included a fragment
     (had a hash part).  This lead to the incorrect links like this

        ...foo#l199?js=1

     instead of adding query parameter as last part of query, but
     before the fragment part, i.e.

        ...foo?js=1#l199

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

* jn/gitweb-js-blame:
  gitweb.js: use setTimeout rather than setInterval in blame_incremental.js
  gitweb.js: No need for loop in blame_incremental's handleResponse()
  gitweb.js: No need for inProgress in blame_incremental.js

If there is a possibility that your logic could take longer to execute
than the interval time, it is recommended that you recursively call a
named function using window.setTimeout rather than window.setInterval.

Therefore instead of using setInterval as an alternate way of invoking
handleResponse (because some web browsers call onreadystatechange only
once per each distinct state, and not for each server flush), use
setTimeout and reset it from handleResponse.  As a bonus this allows
us to get rid of timer if it turns out that web browser calls
onreadystatechange on each server flush.

While at it get rid of `xhr' global variable, creating it instead as
local variable in startBlame and passing it as parameter, and of
`pollTimer' global variable, passing it as member of xhr object
(xhr.pollTimer).

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

JavaScript is single-threaded, so there is no need for protecting
against changes to XMLHttpRequest object behind event handler back.

Therefore there is no need for loop that was here in case `xhr' got
new changes while processing current changes.  This should make code a
bit more clear.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

JavaScript is single-threaded, so there is no need for protection
against re-entrancy via inProgress variable.

In particular calls to setInterval handler are stacked if handler
doesn't finish before new interrupt (before new interval).  The same
happens with events - they are (hopefully) stacked if even handler
didn't finish work.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

* jn/gitweb-js:
  gitweb: Make JavaScript ability to adjust timezones configurable
  gitweb.js: Add UI for selecting common timezone to display dates
  gitweb: JavaScript ability to adjust time based on timezone
  gitweb: Unify the way long timestamp is displayed
  gitweb: Refactor generating of long dates into format_timestamp_html
  gitweb.js: Provide getElementsByClassName method (if it not exists)
  gitweb.js: Introduce code to handle cookies from JavaScript
  gitweb.js: Extract and improve datetime handling
  gitweb.js: Provide default values for padding in padLeftStr and padLeft
  gitweb.js: Update and improve comments in JavaScript files
  gitweb: Split JavaScript for maintability, combining on build

This will modify HTML, add CSS rules and add DOM event handlers so
that clicking on any date (the common part, not the localtime part)
will display a drop down menu to choose the timezone to change to.

Currently menu displays only the following timezones:

  utc
  local
  -1200
  -1100
  ...
  +1100
  +1200
  +1300
  +1400

In timezone selection menu each timezone is +1hr to the previous.  The
code is capable of handling fractional timezones, but those have not
been added to the menu.

All changes are saved to a cookie, so page changes and closing /
reopening browser retains the last known timezone setting used.

[jn: Changed from innerHTML to DOM, moved to event delegation for
onclick to trigger menu, added close button and cookie refreshing]

Helped-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: John 'Warthog9' Hawley <warthog9@eaglescrag.net>
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>