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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 31] 31.15 Fooling vi into Allowing Complex Macros </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:46:27Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch31_01.htm"TITLE="31. Creating Custom Commands in vi"><LINKREL="prev"HREF="ch31_14.htm"TITLE="31.14 Don't Lose Important Functions with vi Maps: Use noremap"><LINKREL="next"HREF="ch31_16.htm"TITLE="31.16 vi Macro for Splitting Long Lines "></HEAD><BODYBGCOLOR="#FFFFFF"TEXT="#000000"><DIVCLASS="htmlnav"><H1><IMGSRC="gifs/smbanner.gif"ALT="UNIX Power Tools"USEMAP="#srchmap"BORDER="0"></H1><MAPNAME="srchmap"><AREASHAPE="RECT"COORDS="0,0,466,58"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="467,0,514,18"HREF="jobjects/fsearch.htm"ALT="Search this book"></MAP><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch31_14.htm"TITLE="31.14 Don't Lose Important Functions with vi Maps: Use noremap"><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 31.14 Don't Lose Important Functions with vi Maps: Use noremap"BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 31<BR>Creating Custom Commands in vi</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch31_16.htm"TITLE="31.16 vi Macro for Splitting Long Lines "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 31.16 vi Macro for Splitting Long Lines "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0145">31.15 Fooling vi into Allowing Complex Macros </A></H2><PCLASS="para"><EMCLASS="emphasis">vi</EM> wants undo to work for macros.<ACLASS="indexterm"NAME="AUTOID-35719"></A>Unfortunately, <EMCLASS="emphasis">vi</EM>'s undo is very simple.Rather than allow complex macros to break undo, <EMCLASS="emphasis">vi</EM> disallowscomplex macros.I believe this is a <EMCLASS="emphasis">big</EM> mistake.I'd much rather give up undo than powerful macros.</P><PCLASS="para">Fortunately (for those who want real macros), the code that figures outwhether a macro will break undo is "very" broken.</P><PCLASS="para">For instance, throwing in an <CODECLASS="literal">mx</CODE> (mark location <CODECLASS="literal">x</CODE>) at the frontof the rhs ["right-hand side" - <EMCLASS="emphasis">JP</EM> ] of a macro often calms <EMCLASS="emphasis">vi</EM> down.For some reason, this sends<EMCLASS="emphasis">vi</EM> through an alternate path on which the macro checking is not as strict.</P><PCLASS="para">Likewise, breaking a single macro into multiple macros that call eachother can also fool <EMCLASS="emphasis">vi</EM>.For example, to do one complex macro, I define:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">map X "bY</PRE></BLOCKQUOTE></P><PCLASS="para">and then use:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">lGkwEX@b</PRE></BLOCKQUOTE></P><PCLASS="para">instead of:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">lGkwE"bY@b</PRE></BLOCKQUOTE></P><PCLASS="para">Using <CODECLASS="literal">"bY</CODE> directly doesn't work, but (on most systems anyway) usingthe macro <CODECLASS="literal">X</CODE> does.</P><PCLASS="para">So what does it mean that you get the message<CODECLASS="literal">can't</CODE> <CODECLASS="literal">put</CODE> <CODECLASS="literal">inside</CODE> <CODECLASS="literal">a</CODE> <CODECLASS="literal">global/macro</CODE>?Probably it means that your UNIX vendor "fixed" <EMCLASS="emphasis">vi</EM> torecognize that a yank can break undo, even if it's in a called macro.</P><PCLASS="para">So rise up.Tell your UNIX vendor that you're tired of being coddled like an MS-DOS user!If you intended to undo that macro, you wouldn't have executed it in thefirst place.Don't let meddling johnny-come-lately UNIX vendors destroy the venerablescrew-the-usertradition that has made UNIX great.Make them put it back the way it was.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">DH</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch31_14.htm"TITLE="31.14 Don't Lose Important Functions with vi Maps: Use noremap"><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 31.14 Don't Lose Important Functions with vi Maps: Use noremap"BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch31_16.htm"TITLE="31.16 vi Macro for Splitting Long Lines "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 31.16 vi Macro for Splitting Long Lines "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">31.14 Don't Lose Important Functions with vi Maps: Use noremap</TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="index"HREF="index/idx_0.htm"TITLE="Book Index"><IMGSRC="gifs/index.gif"SRC="gifs/index.gif"ALT="Book Index"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172">31.16 vi Macro for Splitting Long Lines </TD></TR></TABLE><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><IMGSRC="gifs/smnavbar.gif"SRC="gifs/smnavbar.gif"USEMAP="#map"BORDER="0"ALT="The UNIX CD Bookshelf Navigation"><MAPNAME="map"><AREASHAPE="RECT"COORDS="0,0,73,21"HREF="../index.htm"ALT="The UNIX CD Bookshelf"><AREASHAPE="RECT"COORDS="74,0,163,21"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="164,0,257,21"HREF="../unixnut/index.htm"ALT="UNIX in a Nutshell"><AREASHAPE="RECT"COORDS="258,0,321,21"HREF="../vi/index.htm"ALT="Learning the vi Editor"><AREASHAPE="RECT"COORDS="322,0,378,21"HREF="../sedawk/index.htm"ALT="sed & awk"><AREASHAPE="RECT"COORDS="379,0,438,21"HREF="../ksh/index.htm"ALT="Learning the Korn Shell"><AREASHAPE="RECT"COORDS="439,0,514,21"HREF="../lrnunix/index.htm"ALT="Learning the UNIX Operating System"></MAP></DIV></BODY></HTML>⌨️ 快捷键说明
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