Re: [dev] [sw] Suckless web-framework

I just want to say thanks for reminding me how absolutely hideous sh
scripts are and to stay away from them.

I honestly can't see why anyone would willfully write anything in sh
anymore (of course, plain sh is better than using bash, ksh or any
other horrible extensions of an already awful thing).

uriel

On Sun, Apr 4, 2010 at 7:03 PM, <node_AT_lavabit.com> wrote:
>>> # grep thinks the second argument is a file
>>> > BL="^index.md$ ^images$"  # Black list
>>>   BL="^index.md$\|^images$" # Black list
>>
>> Wrong, take a look at this line:
>> BL=`echo ${BL} | sed -e "s/\( \+\|^\)/ -e /g"`
>
> Yes, -e allows you to do this. However, in the original code you had
>> BL="^index.md$ ^images$"  # Black list
> and later...
>>       for i in `ls ${SITE}/${DIR} | grep -v ${BL}`; do
> I know the blacklist ($BL) was meant as an example, but if you run this
> code you'll see that grep errors out because it thinks `^images$' is a
> file.
>
> If you really want people to use space as a delimiter, then either do:
>
>  for i in BL; do
>        tmp="$tmp -e $i"
>  done
>  BL=$tmp
>  grep -q $BL
>
> or:
>
>  set -- $BL
>  IFS='|'
>  BL=$*
>  grep -Eq "$BL" ...
>
> Both are pretty stupid.
>
>>> # echo | blah is becoming rampant; let's not ignore it this time
>>> > QUERY=`echo ${REQUEST_URI} | sed -e "s,.*${BIN}/*\(.*\),\1,"`
>>>   QUERY=`sed "s,.*$BIN/*\(.*\),\1," <<-!
>>>      $REQUEST_URI
>>>      !
>>
>> So, it is better to use 3 loc for this?
>
> Sadly, POSIX shell sucks. In bash, perl and powershell you could get
> away with a less verbose herestring:
>
>  grep pattern <<< str
>
>>> # Why heredoc instead of subshell?
>>> # Compare: time for i in `seq 1 1000`; do echo str | grep pattern
>>> >/dev/null; done
>>> # ...with: time for i in `seq 1 1000`; do grep pattern >/dev/null <<-!
>>> #                                    str
>>> #                                    !
>>>              # heredocs can also contain subshells... you save one
>>>              # from `cmd | cmd`
>>> >            DIR=`dirname ${QUERY} | sed -e "s,/*$,,"`>
>>> > #                                  done
>>
>> I see, this is a more interesting argument for using heredocs. But,
>> just a question (because I don't really know) is heredocs as standard as
>> a plain "echo blah | cmd" ?
>
> heredocs are defined by POSIX, if that's what you mean by standard
>
>
> Semi unrelated question: why are so many people at suckless using ` `
> instead of $( ) ? I've seen it here, dmenu_path, surf's config.h... etc.
>
> $( ) only fails in very, very old shells... think original bourne
>
>
>
>
>
Received on Sun Apr 04 2010 - 22:02:03 UTC