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, 34 insertions, 0 deletions

diff --git a/src/undo.h b/src/undo.h
new file mode 100644
index 0000000000..aecab36875
--- /dev/null
+++ b/src/undo.h
@@ -0,0 +1,34 @@
+#ifndef NEOVIM_UNDO_H
+#define NEOVIM_UNDO_H
+/* undo.c */
+int u_save_cursor __ARGS((void));
+int u_save __ARGS((linenr_T top, linenr_T bot));
+int u_savesub __ARGS((linenr_T lnum));
+int u_inssub __ARGS((linenr_T lnum));
+int u_savedel __ARGS((linenr_T lnum, long nlines));
+int undo_allowed __ARGS((void));
+int u_savecommon __ARGS((linenr_T top, linenr_T bot, linenr_T newbot,
+                         int reload));
+void u_compute_hash __ARGS((char_u *hash));
+char_u *u_get_undo_file_name __ARGS((char_u *buf_ffname, int reading));
+void u_write_undo __ARGS((char_u *name, int forceit, buf_T *buf, char_u *hash));
+void u_read_undo __ARGS((char_u *name, char_u *hash, char_u *orig_name));
+void u_undo __ARGS((int count));
+void u_redo __ARGS((int count));
+void undo_time __ARGS((long step, int sec, int file, int absolute));
+void u_sync __ARGS((int force));
+void ex_undolist __ARGS((exarg_T *eap));
+void ex_undojoin __ARGS((exarg_T *eap));
+void u_unchanged __ARGS((buf_T *buf));
+void u_find_first_changed __ARGS((void));
+void u_update_save_nr __ARGS((buf_T *buf));
+void u_clearall __ARGS((buf_T *buf));
+void u_saveline __ARGS((linenr_T lnum));
+void u_clearline __ARGS((void));
+void u_undoline __ARGS((void));
+void u_blockfree __ARGS((buf_T *buf));
+int bufIsChanged __ARGS((buf_T *buf));
+int curbufIsChanged __ARGS((void));
+void u_eval_tree __ARGS((u_header_T *first_uhp, list_T *list));
+/* vim: set ft=c : */
+#endif /* NEOVIM_UNDO_H */