Tonight I've tried this little hack, but I do not have a comprehensive test suite (does any exists?)
https://github.com/JehanneOS/jehanne/commit/003141901af25f0bb3556be40b7ff963f57ced32 I thought that there's no reason to mimic sh for this since if you need sh to run a script rc won't work anyway. So this is just a little syntactic sugar, that for the joy of sl is not compatible with sh, but imho it can also increases the readability of scripts. Indeed I agree with sl that expliitness is an advantage of the current quotation rules. The idea is to use a single $ to mark the end of variable declarations, so that what's left can't do assignments, and equality is always quoted. Here some examples: % a=1 echo b=$a rc: #d/0: token '=': syntax error % a=1 $ echo b=$a b=1 % $ eval prefix=$home/foo && echo $prefix /usr/glenda/foo % $ eval prefix=$home/foo; echo ./configure --prefix=$prefix rc: #d/0: token '=': syntax error % $ eval prefix=$home/foo; $ echo ./configure --prefix=$prefix ./configure --prefix=/usr/glenda/foo % inf=/dev/random out=/dev/null $ echo dd if=$inf of=$out dd if=/dev/random of=/dev/null The mini-syntax should extend till the end of a single command: ; & && and || should stop it. Note that it's the first time I use yacc, so probably there is a better way to code this and there are probably bugs. For example I was unable to make this works: % $ echo ./configure --prefix=`{cat /env/prefix} Giacomo 2017-05-16 17:59 GMT+02:00 Erik Quanstrom <quans...@quanstro.net>: > by doing it in the grammar, the redirection issue is avoided. > > - erik > > > On May 16, 2017 2:24 AM, Charles Forsyth <charles.fors...@gmail.com> > wrote: > > > On 15 May 2017 at 17:44, trebol <trebol55...@yandex.ru> wrote: > > > = is part of rc syntax, like {} and (), and it interprets it, not the > > > i'd forgotten about the = in >[2=1], so you'd need another exception ... > rc would interpret that, but then in [a-b=] it presumably wouldn't again... > > >
