This fixes all memory leaks found by compiling with
clang++ -g -fsanitize=address and running the tests.
Method:
Ensure that memory is freed by the destructor of its respective container,
either by storing objects directly instead of by pointer, or implementing
the required destructor.
Rather than storing short and long options separately, using
a complicated set of invariants, store them in a single string
and use an explicit type complete_option_type_t to track how they
are interpreted.
This was a "cache" of dubious value that was also very confusing.
The idea was to express in one place all of the short options that
were allowed for a command, in a big string. But it's simpler to
just construct that on-demand by walking the list of
complete_entry_opt_t.
Also remove some other dead code as part of cleanup.
This change eliminates global variables like stdout_buffer. Instead we wrap up
the IO information into a new struct io_streams_t, and thread that through
every builtin. This makes the intent clearer, gives us a place to hang new IO
data, and eliminates the ugly global state management like builtin_push_io.
In a few places, we need to add a prefix to completions that
replace the token. This change factors that logic into its
own function prepend_token_prefix.
This change moves source files into a src/ directory,
and puts object files into an obj/ directory. The Makefile
and xcode project are updated accordingly.
Fixes#1866
