PATCH: replace-string-again

[Peter Stephenson <pws@xxxxxxx>]

I've separated out the back end of replace-string to make it easy to
repeat the last replacement operation.

Index: Doc/Zsh/contrib.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/contrib.yo,v
retrieving revision 1.63
diff -u -r1.63 contrib.yo
--- Doc/Zsh/contrib.yo	14 Aug 2006 16:58:47 -0000	1.63
+++ Doc/Zsh/contrib.yo	10 Oct 2006 11:13:56 -0000
@@ -1055,8 +1055,10 @@
 similar functions while reading a value.
 )
 tindex(replace-string)
+tindex(replace-string-again)
 tindex(replace-pattern)
-item(tt(replace-string), tt(replace-pattern))(
+xitem(tt(replace-string), tt(replace-pattern))
+item(tt(replace-string-again), tt(replace-pattern-again))(
 The function tt(replace-string) implements two widgets.
 If defined under the same name as the function, it prompts for two
 strings; the first (source) string will be replaced by the second
@@ -1082,6 +1084,13 @@
 numeric argument forces the previous values to be offered, a negative or
 zero argument forces them not to be.
 
+The function tt(replace-string-again) can be used to repeat the
+previous replacement; no prompting is done.  As with tt(replace-string), if
+the name of the widget contains the word `tt(pattern)', pattern matching
+is performed, else a literal string replacement.  Note that the
+previous source and replacement text are the same whether pattern or string
+matching is used.
+
 For example, starting from the line:
 
 example(print This line contains fan and fond)
Index: Functions/Zle/replace-string
===================================================================
RCS file: /cvsroot/zsh/zsh/Functions/Zle/replace-string,v
retrieving revision 1.2
diff -u -r1.2 replace-string
--- Functions/Zle/replace-string	13 Jan 2005 15:31:53 -0000	1.2
+++ Functions/Zle/replace-string	10 Oct 2006 11:13:56 -0000
@@ -1,11 +1,11 @@
 emulate -L zsh
 setopt extendedglob
 
-autoload read-from-minibuffer
+autoload -U read-from-minibuffer replace-string-again
 
 local p1="Replace: " p2="   with: "
-local REPLY MATCH MBEGIN MEND curwidget=$WIDGET previous
-local -a match mbegin mend
+# Saving curwidget is necessary to avoid the widget name being overwritten.
+local REPLY previous curwidget=$WIDGET
 
 if (( ${+NUMERIC} )); then
   (( $NUMERIC > 0 )) && previous=1
@@ -20,34 +20,4 @@
   ${previous:+$_replace_string_rep} || return 1
 _replace_string_rep=$REPLY
 
-if [[ $curwidget = *pattern* ]]; then
-    local rep2
-    # The following horror is so that an & preceded by an even
-    # number of backslashes is active, without stripping backslashes,
-    # while preceded by an odd number of backslashes is inactive,
-    # with one backslash being stripped.  A similar logic applies
-    # to \digit.
-    local rep=$_replace_string_rep
-    while [[ $rep = (#b)([^\\]#)(\\\\)#(\\|)(\&|\\<->|\\\{<->\})(*) ]]; do
-	if [[ -n $match[3] ]]; then
-	    # Expression is quoted, strip quotes
-	    rep2="${match[1]}${match[2]}${match[4]}"
-	else
-	    rep2+="${match[1]}${match[2]}"
-	    if [[ $match[4] = \& ]]; then
-		rep2+='${MATCH}'
-	    elif [[ $match[4] = \\\{* ]]; then
-		rep2+='${match['${match[4][3,-2]}']}'
-	    else
-		rep2+='${match['${match[4][2,-1]}']}'
-	    fi
-	fi
-	rep=${match[5]}
-    done
-    rep2+=$rep
-    LBUFFER=${LBUFFER//(#bm)$~_replace_string_src/${(e)rep2}}
-    RBUFFER=${RBUFFER//(#bm)$~_replace_string_src/${(e)rep2}}
-else
-    LBUFFER=${LBUFFER//$_replace_string_src/$_replace_string_rep}
-    RBUFFER=${RBUFFER//$_replace_string_src/$_replace_string_rep}
-fi
+replace-string-again $curwidget
Index: Functions/Zle/replace-string-again
===================================================================
RCS file: Functions/Zle/replace-string-again
diff -N Functions/Zle/replace-string-again
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ Functions/Zle/replace-string-again	10 Oct 2006 11:13:56 -0000
@@ -0,0 +1,45 @@
+# Back end for replace-string; can be called as a widget to repeat
+# the previous replacement.  _replace_string_src and _replace_string_rep
+# are global.
+
+# When called from replace-string, we need to use the widget
+# name passed to decide whether to do pattern matching: the widget
+# may since have been overwritten.
+local MATCH MBEGIN MEND curwidget=${1:-$WIDGET}
+local -a match mbegin mend
+
+if [[ -z $_replace_string_src ]]; then
+  zle -M No string to replace.
+fi
+
+if [[ $curwidget = *pattern* ]]; then
+    local rep2
+    # The following horror is so that an & preceded by an even
+    # number of backslashes is active, without stripping backslashes,
+    # while preceded by an odd number of backslashes is inactive,
+    # with one backslash being stripped.  A similar logic applies
+    # to \digit.
+    local rep=$_replace_string_rep
+    while [[ $rep = (#b)([^\\]#)(\\\\)#(\\|)(\&|\\<->|\\\{<->\})(*) ]]; do
+	if [[ -n $match[3] ]]; then
+	    # Expression is quoted, strip quotes
+	    rep2="${match[1]}${match[2]}${match[4]}"
+	else
+	    rep2+="${match[1]}${match[2]}"
+	    if [[ $match[4] = \& ]]; then
+		rep2+='${MATCH}'
+	    elif [[ $match[4] = \\\{* ]]; then
+		rep2+='${match['${match[4][3,-2]}']}'
+	    else
+		rep2+='${match['${match[4][2,-1]}']}'
+	    fi
+	fi
+	rep=${match[5]}
+    done
+    rep2+=$rep
+    LBUFFER=${LBUFFER//(#bm)$~_replace_string_src/${(e)rep2}}
+    RBUFFER=${RBUFFER//(#bm)$~_replace_string_src/${(e)rep2}}
+else
+    LBUFFER=${LBUFFER//$_replace_string_src/$_replace_string_rep}
+    RBUFFER=${RBUFFER//$_replace_string_src/$_replace_string_rep}
+fi

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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