# \[FEATURE:trunk\] Readline.completion\_proc = nil $B$r5v2D$9$k!#(B

**URL:** <https://www.ruby-forum.com/t/feature-trunk-readline-completion-proc-nil-b-r5v2d-9-k-b/159289>\
**Category:** Development\
**Created:** [February 3, 2009, 6:57am UTC](https://www.ruby-forum.com/t/feature-trunk-readline-completion-proc-nil-b-r5v2d-9-k-b/159289 "2009-02-03T06:57:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Takao\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/ad7895/32.png) [@Takao\_K](https://www.ruby-forum.com/u/Takao_K)\
**Post date:** [February 3, 2009, 6:57am UTC](https://www.ruby-forum.com/t/feature-trunk-readline-completion-proc-nil-b-r5v2d-9-k-b/159289/1 "2009-02-03T06:57:59Z")

</div>

e$B9bHx9(\<#$G$9!#e(B

Readline.readlinee$B$NJd408uJd$r\<hF@$9$ke(B Proc e$B$re(B  
Readline.completion\_proc= e$B$G;XDj$G$-$^$9!#e(B  
e$B$7$+$7!“Jd408uJd$r\<hF@$9$k=hM}$r%G%U%)%k%H$N$b$N$KLa$9J}K!$,$”$j$^$;$s!#e(B  
Readline.completion\_proc e$B$Ke(B nil  
e$B$r%;%C%H$G$-$l$P%G%U%)%k%H$N5sF0$K$J$k$N$G!"e(B  
e$B$=$l$r5v2D$7$h$&$H;W$$$^$9!#0J2\<$N$h$&$J5-=R$,$G$-$k$h$&$K$J$j$^$9!#e(B

begin  
Readline.completion\_proc = Proc.new { |s|  
…  
}  
s = Readline.readline  
ensure  
Readline.completion\_proc = nil  
end

e$B8=:\_$O!"e(BReadline.completion\_proc= e$B%a%=%C%I$NCf$G!"e(B  
e$B0z$-?t$G;XDj$5$l$?%\*%V%8%’%/%H$,e(B call  
e$B%a%=%C%I$r$b$C$F$$$k$+$I$&$+%A%’%C%/$7$F$$$k$N$G!"e(B

Readline.completion\_proc = nil

e$B$Ge(B ArgumentError e$BNc30$,H/@8$7$^$9!#e(B  
nile$B$N\>l9g$OFCJL07$$$7$F!"e(Bcompletion\_proc  
e$B$KBeF~$G$-$k$h$&$K$7$h$&$H;W$$$^$9!#e(B  
e$B$$$+$,$G$7$g$&$+!#e(B

# Index: readline.c

— readline.c (revision 21997)  
+++ readline.c (working copy)  
@@ -304,6 +304,8 @@

- should take input-string, and return an array of completion
- candidates.
- 

- 
  - Set default if +proc+ is nil.

- 
  - 
  - Raises ArgumentError exception if +proc+ does not respond to call  
method.
  - 
  - Raises SecurityError exception if $SAFE is 4.  
@@ -312,7 +314,7 @@  
readline\_s\_set\_completion\_proc(VALUE self, VALUE proc)  
{  
rb\_secure(4);

- if (!rb\_respond\_to(proc, rb\_intern(“call”)))

- if (!NIL\_P(proc) && !rb\_respond\_to(proc, rb\_intern(“call”)))  
rb\_raise(rb\_eArgError, “argument must respond to `call’”);  
return rb\_ivar\_set(mReadline, completion\_proc, proc);  
}

---

<div class="post-metadata">

**Author:** ![Takao\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/ad7895/32.png) [@Takao\_K](https://www.ruby-forum.com/u/Takao_K)\
**Post date:** [February 3, 2009, 9:17am UTC](https://www.ruby-forum.com/t/feature-trunk-readline-completion-proc-nil-b-r5v2d-9-k-b/159289/2 "2009-02-03T09:17:20Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37880] [FEATURE:trunk]  
Readline.completion\_proc = nil e$B$r5v2D$9$k!#e(B”  
on Tue, 3 Feb 2009 14:57:10 +0900, Takao K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|Readline.readlinee$B$NJd408uJd$r\<hF@$9$ke(B Proc e$B$re(B Readline.completion\_proc= e$B$G;XDj$G$-$^$9!#e(B  
|e$B$7$+$7!“Jd408uJd$r\<hF@$9$k=hM}$r%G%U%)%k%H$N$b$N$KLa$9J}K!$,$”$j$^$;$s!#e(B  
|Readline.completion\_proc e$B$Ke(B nil e$B$r%;%C%H$G$-$l$P%G%U%)%k%H$N5sF0$K$J$k$N$G!"e(B  
|e$B$=$l$r5v2D$7$h$&$H;W$$$^$9!#0J2\<$N$h$&$J5-=R$,$G$-$k$h$&$K$J$j$^$9!#e(B

|e$B$$$+$,$G$7$g$&$+!#e(B

e$B$$$$$s$8$c$J$$$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Takao\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/ad7895/32.png) [@Takao\_K](https://www.ruby-forum.com/u/Takao_K)\
**Post date:** [February 3, 2009, 1:17pm UTC](https://www.ruby-forum.com/t/feature-trunk-readline-completion-proc-nil-b-r5v2d-9-k-b/159289/3 "2009-02-03T13:17:29Z")

</div>

e$B%A%1%C%He(B #1095 e$B$,99?7$5$l$^$7$?!#e(B (by Kouji T.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

## Applied in changeset r22012.

[http://redmine.ruby-lang.org/issues/show/1095](http://redmine.ruby-lang.org/issues/show/1095)