Removes 'proto' dir

See #137 for the issue.

Every header in the proto directory was:

* Given include guards in the form

    #ifndef NEOVIM_FILENAME_H
    #define NEOVIM_FILENAME_H
        ...
    #endif /* NEOVIM_FILENAM_H */

* Renamed from *.pro -> *.h
* Moved from src/proto/ to src/

This would have caused conficts with some existing headers in src/;
rather than merge these conflicts now (which is a whole other can of
worms involving multiple and conditional inclusion), any header in src/
with a conflicting name was renamed from *.h -> *_defs.h (which may or
may not actually describe its purpose, the change is purely a
namespacing issue).

Once all of these changes were made a script was developed to determine
what #includes needed to be added to each source file to describe its
dependencies and allow it to compile; because the script is so short
and I'll just list it here:

    #! /bin/bash

    cd $(dirname $0)

    # Scrapes `make` output for provided error messages and outputs #includes
    # needed to resolve them.
    #   $1 : part of the clang error message between filename and identifier
    list_missing_includes() {
        for file_missing_pair in $(CC=clang make 2>&1 >/dev/null | sed -n "s/\/\(.*\.[hc]\).*$1.*'\(.*\)'.*/\1:\2/p"); do
            fields=(${file_missing_pair//:/ })
            source_file=${fields[0]}
            missing_func=${fields[1]}
            # Try to find the declaration of the missing function.
            echo $(basename $source_file) \
                \#include \"$(grep -r "\b$missing_func __ARGS" | sed -n "s/.*\/\(.*\)\:.*/\1/p")\"
        # Remove duplicates
        done | sort | uniq
    }

    echo "Finding missing function prototypes..."
    list_missing_includes "implicit declaration of function"
    echo "Finding missing identifier declarations..."
    list_missing_includes "use of undeclared identifier"

Each list of required headers was added by hand in the following format:

    #include "vim.h"
    #include "*_defs.h"
    #include "filename.h"
    /* All other includes in same module here, in alphabetical order. */
    /* All includes from other modules (e.g. "os/*.h") here in alphabetical
     * order. */

1 files changed, 18 insertions, 0 deletions

diff --git a/src/tag.h b/src/tag.h
new file mode 100644
index 0000000000..829d48ff7b
--- /dev/null
+++ b/src/tag.h
@@ -0,0 +1,18 @@
+#ifndef NEOVIM_TAG_H
+#define NEOVIM_TAG_H
+/* tag.c */
+int do_tag __ARGS((char_u *tag, int type, int count, int forceit, int verbose));
+void tag_freematch __ARGS((void));
+void do_tags __ARGS((exarg_T *eap));
+int find_tags __ARGS((char_u *pat, int *num_matches, char_u ***matchesp,
+                      int flags, int mincount,
+                      char_u *buf_ffname));
+void free_tag_stuff __ARGS((void));
+int get_tagfname __ARGS((tagname_T *tnp, int first, char_u *buf));
+void tagname_free __ARGS((tagname_T *tnp));
+void simplify_filename __ARGS((char_u *filename));
+int expand_tags __ARGS((int tagnames, char_u *pat, int *num_file,
+                        char_u ***file));
+int get_tags __ARGS((list_T *list, char_u *pat));
+/* vim: set ft=c : */
+#endif /* NEOVIM_TAG_H */