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, 33 insertions, 0 deletions

diff --git a/src/diff.h b/src/diff.h
new file mode 100644
index 0000000000..5a2d32204e
--- /dev/null
+++ b/src/diff.h
@@ -0,0 +1,33 @@
+#ifndef NEOVIM_DIFF_H
+#define NEOVIM_DIFF_H
+/* diff.c */
+void diff_buf_delete __ARGS((buf_T *buf));
+void diff_buf_adjust __ARGS((win_T *win));
+void diff_buf_add __ARGS((buf_T *buf));
+void diff_invalidate __ARGS((buf_T *buf));
+void diff_mark_adjust __ARGS((linenr_T line1, linenr_T line2, long amount,
+                              long amount_after));
+void ex_diffupdate __ARGS((exarg_T *eap));
+void ex_diffpatch __ARGS((exarg_T *eap));
+void ex_diffsplit __ARGS((exarg_T *eap));
+void ex_diffthis __ARGS((exarg_T *eap));
+void diff_win_options __ARGS((win_T *wp, int addbuf));
+void ex_diffoff __ARGS((exarg_T *eap));
+void diff_clear __ARGS((tabpage_T *tp));
+int diff_check __ARGS((win_T *wp, linenr_T lnum));
+int diff_check_fill __ARGS((win_T *wp, linenr_T lnum));
+void diff_set_topline __ARGS((win_T *fromwin, win_T *towin));
+int diffopt_changed __ARGS((void));
+int diffopt_horizontal __ARGS((void));
+int diff_find_change __ARGS((win_T *wp, linenr_T lnum, int *startp, int *endp));
+int diff_infold __ARGS((win_T *wp, linenr_T lnum));
+void nv_diffgetput __ARGS((int put));
+void ex_diffgetput __ARGS((exarg_T *eap));
+int diff_mode_buf __ARGS((buf_T *buf));
+int diff_move_to __ARGS((int dir, long count));
+linenr_T diff_get_corresponding_line __ARGS((buf_T *buf1, linenr_T lnum1,
+                                             buf_T *buf2,
+                                             linenr_T lnum3));
+linenr_T diff_lnum_win __ARGS((linenr_T lnum, win_T *wp));
+/* vim: set ft=c : */
+#endif /* NEOVIM_DIFF_H */