Re: zsh-ify a bash script

[Daniel Shahaf <d.s@daniel.shahaf.name>]

Andreas Kusalananda Kähäri wrote on Thu, Jan 20, 2022 at 12:26:06 +0100:
> On Thu, Jan 20, 2022 at 11:40:56AM +0100, Mikael Magnusson wrote:
> > On 1/20/22, Mikael Magnusson <mikachu@gmail.com> wrote:
> > > On 1/20/22, Bart Schaefer <schaefer@brasslantern.com> wrote:
> > >> On Wed, Jan 19, 2022 at 12:57 PM zzapper <zsh@rayninfo.co.uk> wrote:
> > >>>
> > >>> Dumb CLI trick. Wanted to find files containing all of several terms
> > >>> (dup2, pledge, socketpair, fork), but they could occur anywhere in the
> > >>> file:
> > >>
> > >> Not zsh any more than the first example, but instead of "grep -l" on
> > >> the entire file contents for each term ...
> > >>
> > >> # start by getting the actual occurrences of all the terms:
> > >> find . -name '*.c' | xargs egrep
> > >> '\<(dup2|pledge|fork|socketpair.*SOCK_STREAM)\>' /dev/null |
> > >> # reduce the results to just file names and search terms:
> > >> sed -E 's/(^[^:]*\.c:).*\<(dup2|pledge|fork|socketpair)\>.*/\1\2/' |
> > >> # make every search term unique per file:
> > >> sort -u |
> > >> # discard the search terms, leaving only file names:
> > >> cut -d : -f 1 |
> > >> # count the number of times each file name appears:
> > >> uniq -c |
> > >> # print names with a count of 4 (the number of search terms):
> > >> sed -nE 's/^ *4 //p'
> > >>
> > >> Adjusting this for edge cases where two search terms appear on the
> > >> same line is left as an exercise.
> > >
> > > This part would probably be fixed by passing -o to grep (didn't test
> > > in the above but):
> > > % echo foobar|grep -E '(foo|bar)'
> > > foobar
> > > % echo foobar|grep -oE '(foo|bar)'
> > > foo
> > > bar
> > 
> > I guess this is more or less the same solution,
> > % grep -Eo '(zsfree|zerr|subst)' Src/**/*.c|sort -u|sed 's/:[^:]*'//|uniq -c|grep -E '^\s+3'
> >       3 Src/Zle/zle_main.c
> >       3 Src/builtin.c
> >       3 Src/exec.c
> >       3 Src/glob.c
> >       3 Src/hist.c
> >       3 Src/jobs.c
> >       3 Src/signals.c
> >       3 Src/subst.c
> >       3 Src/utils.c
> > 
> > 
> 
> Awk-ifying the end of that pipeline... and just playing around with the
> grep a bit for fun (changed to use BREs, but still non-standard due to
> -w and -o).
> 
> grep -Fwo -e zsfree -e zerr -e subst -- Src/**/*.c |
> awk -F: '!seen[$0]++ && ++count[$1] == 3 { print $1 }'
> 
> This obviously assumes that no pathname contains colons or embedded
> newlines.

Using glob qualifiers:

% has() { <$REPLY grep -q -- "$1" }
% print -raC1 -- **/*.c(e*has zerr*e*has zsfree*e*has subst*) 
Src/Zle/zle_main.c
Src/builtin.c
Src/exec.c
Src/glob.c
Src/hist.c
Src/jobs.c
Src/signals.c
Src/subst.c
Src/utils.c
%