This little error caused that when parsing compile_commands json, the
filename was used to fetch entries in directory dictionary, hence, when
adding new json commands, it never found anything in dir_lookup and
instead rewrote the previous entry. Hence, the dir_lookup always
contained list of only one compile_command per directory instead of all
compile_commands for given directory.
When using a compilation database (compile_commands.json) in very large
projects, significant delays would occur when changing files --
particularly those that happened to be far down the db. Rather than
iterating over the whole list every time, we now build up a lookup table
based on the tail of the filename (and tail of the directory for
widening searches) and iterate over the much smaller list of compile
commands for files with the given name.
Test metrics (from compile_database_perf/test.sh) show a 90% performance
improvement -- from 25 seconds to 2.5 seconds per run.
Split by space instead of dash.
This prevents incorrect parsing where space-separated arguments are
merged (in particular, .c or .o files were appended to -I or -D
arguments).
Handle shell escape: quotes and escaped quotes \" and shell
substitutions are recognised. This is done by verifying that no special
character (" ' ` ()) has not a matching character.
Fixes#2049
There is currently a check that tries to prevent c-flags that contain
'-' in them from being unintentionally split and included in the list of
commands. For example, we wouldn't want "-fno-exceptions " to appear as
"-fno" and "-exceptions ". The way this check was done was by making sure
the last character of the split string was a space.
This meant that the very last option to appear in the compile command
was ignored (as it doesn't end with a space). This fix explicitly skips
the ends-with-space check on the last option in the command-line.
This isn't the best fix. Really we should be using the same
argument-processing rules as a shell would rather than just splitting on
'-'. That's a much larger and more complicated change though.
* The project style linter now runs while you type.
* Now the scripts for checking the project require blank lines.
* Many style issues have been found and fixed.
