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Date: Thu, 08 Apr 2010 15:31:41 +0200
From: Thomas Wolff <towo AT towo DOT net>
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Subject: Re: Fwd: cannot search for -a in man inside mintty under cygwin-1.7
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Andy Koppe schrieb:
>> moo.tinys wrote:
>>     
>>> using mintty
>>> LANG=zh_CN.UTF-8 mintty
>>> inside mintty:
>>> $ man man
>>> /-
>>> Pattern not found  (press RETURN)
>>>       
> With UTF-8, hyphen/minus symbols in the man page are displays as the
> Unicode codepoints for hyphen or minus. These are different from ASCII
> '-', which is why your search didn't turn up anything.
>
> This isn't mintty-specific.
>
> Thomas Wolff:
>   
>> This was discussed here before but I'm not sure whether a solution was
>> already outlined.
>> The problem appeared on Linux too, some years ago, but has been fixed
>> meanwhile.
>> Differences are:
>> man calls nroff -mandoc on cygwin, nroff -mandocdb on Linux. The latter
>> macro package of groff includes the following which is prepended to the
>> manual page before feeding it to nroff for formatting:
>> .if '\*[.T]'utf8' \{\
>> .  char \- \N'45'
>> .  char  - \N'45'
>> .  char  ' \N'39'
>> .  char  ` \N'96'
>> .\}
>>     
>
> Thanks, glad to hear there is a fix. I'll use this in the mintty
> manpage, so at least searching will work there.
>
> Question: what's the *[.T] pattern matched against?
>   
I guess the -Tutf8 parameter also showed by procps (with some luck while 
invoking man...):
troff -mtty-char -mandoc -Tutf8
groff -mtty-char -Tutf8 -P-c -mandoc
I have no idea why both groff and troff appear in the process list or 
how the -Tutf8 parameter is set there.

>> Checking the program chain of 'man' with procps, some other macros are added
>> already (simply using 'echo'), that's where it could also be added without a
>> complete new macro package (i.e. without changing groff). However, the
>> auxiliary roff codes are apparently hard-coded in man.exe so that'll have to
>> be changed.
>>     
> What are those auxiliary roff codes?
>   
I mean those being echoed into the nroff pipe as revealed by 'procps 
xww' while running man:
sh -c (cd "/usr/share/man" && (echo ".pl 1100i"; /usr/bin/gunzip -c 
'/usr/share/man/man1/mintty.1.gz'; echo ".\\\""; echo ".pl \n(nlu+10") | 
/usr/bin/tbl | /usr/bin/nroff -c -mandoc 2>/dev/null | /usr/bin/less -isrR)

I guess the additional lines as quoted above can simply be added by a 
few strcat calls inserted before line 572 of man.c.
I couldn't test, though, because the man source package needs some 
interactive configuration before make works.

------
Thomas

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