vim中一些有用但是不常用功能备忘

&			Synonym for `:s` (repeat last substitute).  Note that the flags are not remembered, thus it might
			actually work differently.  You can use `:&&` to keep
			the flags.
								*g&* g&			Synonym for `:%s//~/&` (repeat last substitute with last search pattern on all lines with the same flags).
			For example, when you first do a substitution with
			`:s/pattern/repl/flags` and then `/search` for
			something else, `g&` will do `:%s/search/repl/flags`.
			Mnemonic: global substitute. {not in Vi}

    static void
nv_optrans(cmdarg_T *cap)
{
    static char_u *(ar[8]) = {(char_u *)"dl", (char_u *)"dh",
			      (char_u *)"d$", (char_u *)"c$",
			      (char_u *)"cl", (char_u *)"cc",
			      (char_u *)"yy", (char_u *)":s\r"};
    static char_u *str = (char_u *)"xXDCsSY&";
///...
}

%                       Find the next item in this line after or under the      
                        cursor and jump to its match. inclusive motion.         
                        Items can be:                                           
                        ([{}])          parenthesis or (curly/square) brackets  
                                        (this can be changed with the           
                                        'matchpairs' option)                    
                        /* */           start or end of C-style comment         
                        #if, #ifdef, #else, #elif, #endif                       
                                        C preprocessor conditionals (when the   
                                        cursor is on the # or no ([{            
                                        following)                  

/*
 * findmatchlimit -- find the matching paren or brace, if it exists within
 * maxtravel lines of the cursor.  A maxtravel of 0 means search until falling
 * off the edge of the file.
 *
 * "initc" is the character to find a match for.  NUL means to find the
 * character at or after the cursor. Special values:
 * '*'  look for C-style comment / *
 * '/'  look for C-style comment / *, ignoring comment-end
 * '#'  look for preprocessor directives
 * 'R'  look for raw string start: R"delim(text)delim" (only backwards)
 *
 * flags: FM_BACKWARD	search backwards (when initc is '/', '*' or '#')
 *	  FM_FORWARD	search forwards (when initc is '/', '*' or '#')
 *	  FM_BLOCKSTOP	stop at start/end of block ({ or } in column 0)
 *	  FM_SKIPCOMM	skip comments (not implemented yet!)
 *
 * "oap" is only used to set oap->motion_type for a linewise motion, it can be
 * NULL
 */

    pos_T *
findmatchlimit(
    oparg_T	*oap,
    int		initc,
    int		flags,
    int		maxtravel)
{
///...
	    /*
	     * initc was not given, must look for something to match under
	     * or near the cursor.
	     * Only check for special things when 'cpo' doesn't have '%'.
	     */
	    if (!cpo_match)
	    {
		/* Are we before or at #if, #else etc.? */
		ptr = skipwhite(linep);
		if (*ptr == '#' && pos.col <= (colnr_T)(ptr - linep))
		{
		    ptr = skipwhite(ptr + 1);
		    if (   STRNCMP(ptr, "if", 2) == 0
			|| STRNCMP(ptr, "endif", 5) == 0
			|| STRNCMP(ptr, "el", 2) == 0)
			hash_dir = 1;
		}

		/* Are we on a comment? */
		else if (linep[pos.col] == '/')
		{
		    if (linep[pos.col + 1] == '*')
		    {
			comment_dir = FORWARD;
			backwards = FALSE;
			pos.col++;
		    }
		    else if (pos.col > 0 && linep[pos.col - 1] == '*')
		    {
			comment_dir = BACKWARD;
			backwards = TRUE;
			pos.col--;
		    }
		}
		else if (linep[pos.col] == '*')
		{
		    if (linep[pos.col + 1] == '/')
		    {
			comment_dir = BACKWARD;
			backwards = TRUE;
		    }
		    else if (pos.col > 0 && linep[pos.col - 1] == '/')
		    {
			comment_dir = FORWARD;
			backwards = FALSE;
		    }
		}
	    }

	    /*
	     * If we are not on a comment or the # at the start of a line, then
	     * look for brace anywhere on this line after the cursor.
	     */
	    if (!hash_dir && !comment_dir)
	    {
		/*
		 * Find the brace under or after the cursor.
		 * If beyond the end of the line, use the last character in
		 * the line.
		 */
		if (linep[pos.col] == NUL && pos.col)
		    --pos.col;
		for (;;)
		{
		    initc = PTR2CHAR(linep + pos.col);
		    if (initc == NUL)
			break;

		    find_mps_values(&initc, &findc, &backwards, FALSE);
		    if (findc)
			break;
		    pos.col += MB_PTR2LEN(linep + pos.col);
		}
		if (!findc)
		{
		    /* no brace in the line, maybe use "  #if" then */
		    if (!cpo_match && *skipwhite(linep) == '#')
			hash_dir = 1;
		    else
			return NULL;
		}
///...
}