ui-tree.c: add support for path-selected submodule links

The current 'repo.module-link' option is sufficient when all gitlinks
in a repository can be converted to commit links in a uniform way, but
not when different submodules/paths needs different settings.

This patch adds support for 'repo.module-link.<path>', which will be
used for linking to submodules at paths matching one such entry.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
ui-plain.c: add support for path-selected submodule links

In ui-plain.c, the links generated for submodule entry ignored the fact
that the entry was in fact a submodule. This patch adds proper submodule
links to the plain directory listings.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Do not provide a default value for `module-link`

The old default value was an abomination which never should have been
allowed to see the light of day.

This patch removes the default, which is a backwards incompatible change
with low probability of causing anyone any real trouble (a repo with
submodules, displayed by cgit using the default value of `module-link`,
is very unlikely to actually generate working links).

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
guess default branch from HEAD

This is a saner alternative than hardcoding the default branch to be
"master". The add_repo() function will now check for a symbolic ref in
repo_path/HEAD. If there is a suitable one, overwrite repo->defbranch
with it. Note that you'll need to strip the newline from the file (->
len-17).

If HEAD is a symbolic link pointing directly to a branch below
refs/heads/, do a readlink() instead to find the ref name.

Signed-off-by: Julius Plenz <plenz@cis.fu-berlin.de>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Only guess default branch when a repo page is requested

There's no need to invoke guess_defbranch() for each repo during
scan-path, since repo.defbranch is only used when repo content is
being displayed.

Also, some users prefer to register their projects manually in cgitrc
but they got no benefit from the new repo.defbranch handling.

This patch tries to rectify these issues by only invoking guess_defbranch()
when needed, regardless of how the repo was registered.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
cgit.c: use resolve_ref() to guess_defbranch()

The resolve_ref() function handles reading of git- and filesystem
symbolic links (including proper whitespace trimming) and packed refs.
There's no point in reimplementing this function in cgit.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
ui_plain: automatically lookup mimetype when mimetype-file is set

For sites that do not want to configure mime types by hand but
still want the correct mime type for 'plain' blobs, configuring
a mime type file is made possible. This is handy since such a
file is normally already provided (at least on Linux systems).

Also, this reflects the gitweb option '$mimetypes_file'

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
ui-repolist.c: fallback to "master" if no default branch is specified

When looking for the modtime of a repo we used to rely on repo.defbranch
having a value. This is no longer true so this patch provides a default
value when needed.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
shared.c: Remove unused "linux/limits.h" include

This isn't used anywhere and prevents the code from being compiled on
other platforms, such as *BSD.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
shared.c: Only setenv() if value is non-null

Some setenv() implementations (e.g. the one in OpenBSD's stdlib)
segfault if we pass a NULL value. Only set environment variables if the
corresponding settings are defined to avoid this.

Note that this is a minor behaviour change as environment variables were
supposed to be set to an empty string if a setting was undefined. Given
that this feature isn't part of any official release yet, there's no
need to worry about backwards compatibility, really. Change the
documentation accordingly.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
ui-ssdiff: move LCS table away from the stack

Printing deferred line changes for files containing long lines would
cause a segfault.

- limit LCS table size: 128x128.
- move LCS table to global context: avoid allocating/freeing memory
  for every deferred line change.

Signed-off-by: Jamie Couture <jamie.couture@gmail.com>
Add sort parameter to pager of repo list

When the repolist is paged, the page-links are missing the sort parameter,
causing the initial page to be custom sorted, but any clicked page will
then be with the default sort order again.
ui-log.c: do not show remote heads if enable-remote-branches=0

If remote branches are not enabled, the branches are still listed in
the log view. This patch removes them if enable-remote-branches=0.
Fix diff mode switching when side-by-side-diffs=1

When side-by-side-diffs=1 was set in cgitrc, specyfing 'ss=0' in the query-
string would not switch to unified diffs. This patch fixes the issue by
introducing a separate variable to track the occurrence of "ss" in the
querystring.
Merge branch 'stable'
ui-ssdiff.c: set correct diffmode in "control panel"

When side-by-side-diffs=1 was set in cgitrc, specifying 'ss=0' in the
querystring would not set the 'unified' option as active in the dropdown
box used to select diffmode.
fix css color value and vertical-align value
Makefile: fetch git tarballs from http://hjemli.net/git/git/

The git tarballs are currently not available from kernel.org, so for now
the makefile will download autogenerated tarballs from cgit.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Merge branch 'stable'
Fix segmentation fault in empty repository

When a repository is empty, the ATOM feed link is written in the header,
but this involves formatting ctx->qry.head which is NULL in this case.
With glibc, vsnprintf formats "%s" with a NULL input as "(null)" but on
Solaris this results in a segmentation fault.  Since we don't have a
meaningful head for the atom feed in an empty repository, it's simplest
not to write out the link element at all.

Signed-off-by: John Keeping <john@metanate.com>