zsh/Test/D03procsubst.ztst

# Tests for process substitution: <(...), >(...) and =(...).

%prep
  if grep '#define PATH_DEV_FD' $ZTST_testdir/../config.h > /dev/null 2>&1 ||
     grep '#define HAVE_FIFOS' $ZTST_testdir/../config.h > /dev/null 2>&1; then
    mkdir procsubst.tmp
    cd procsubst.tmp
    print 'First\tSecond\tThird\tFourth' >FILE1
    print 'Erste\tZweite\tDritte\tVierte' >FILE2
  else
    ZTST_unimplemented="process substitution is not supported"
    true
  fi

  function copycat { cat "$@" }

%test
  paste <(cut -f1 FILE1) <(cut -f3 FILE2)
0:<(...) substitution
>First	Dritte

# slightly desperate hack to force >(...) to be synchronous
  { paste <(cut -f2 FILE1) <(cut -f4 FILE2) } > >(sed 's/e/E/g' >OUTFILE)
  cat OUTFILE
0:>(...) substitution
>SEcond	ViErtE

  diff =(cat FILE1) =(cat FILE2)
1:=(...) substituion
>1c1
>< First	Second	Third	Fourth
>---
>> Erste	Zweite	Dritte	Vierte

  copycat <(print First) <(print Zweite)
0:FDs remain open for external commands called from functions
>First
>Zweite

  catfield2() {
    local -a args
    args=(${(s.,.)1})
    print $args[1]
    cat $args[2]
    print $args[3]
  }
  catfield2 up,<(print $'\x64'own),sideways
0:<(...) when embedded within an argument
>up
>down
>sideways

  outputfield2() {
    local -a args
    args=(${(s.,.)1})
    print $args[1]
    echo 'How sweet the moonlight sits upon the bank' >$args[2]
    print $args[3]
  }
  outputfield2 muddy,>(sed -e s/s/th/g >outputfield2.txt),vesture
  # yuk
  while [[ ! -e outputfield2.txt || ! -s outputfield2.txt ]]; do :; done
  cat outputfield2.txt
0:>(...) when embedded within an argument
>muddy
>vesture
>How thweet the moonlight thitth upon the bank

  catfield1() {
    local -a args
    args=(${(s.,.)1})
    cat $args[1]
    print $args[2]
  }
  catfield1 =(echo s$'\x69't),jessica
0:=(...) followed by something else without a break
>sit
>jessica

  (
  setopt nonomatch
  # er... why is this treated as a glob?
  print everything,=(here is left),alone
  )
0:=(...) preceded by other stuff has no special effect
>everything,=(here is left),alone

  print something=${:-=(echo 'C,D),(F,G)'}
1: Graceful handling of bad substitution in enclosed context
?(eval):1: unterminated `=(...)'
# '`

  () {
     print -n "first: "
     cat $1
     print -n "second: "
     cat $2
  } =(echo This becomes argument one) =(echo and this argument two)
  function {
     print -n "third: "
     cat $1
     print -n "fourth: "
     cat $2
  } =(echo This becomes argument three) =(echo and this argument four)
0:Process environment of anonymous functions
>first: This becomes argument one
>second: and this argument two
>third: This becomes argument three
>fourth: and this argument four

  () {
     # Make sure we don't close the file descriptor too early
     eval 'print "Execute a complicated command first" | sed s/command/order/'
     cat $1
  } <(echo This line was brought to you by the letters F and D)
0:Process substitution as anonymous function argument
>Execute a complicated order first
>This line was brought to you by the letters F and D

  alias foo='cat <('
  eval 'foo echo this is bound to work)'
0:backtacking within command string parsing with alias still pending
>this is bound to work

  alias foo='cat <( print'
  eval 'foo here is some output)'
0:full alias expanded when substitution starts in alias
>here is some output

  if ! (mkfifo test_pipe >/dev/null 2>&1); then
    ZTST_skip="mkfifo not available"
  else
    echo 1 | tee >(cat > test_pipe) | (){
      local pipein
      read pipein <test_pipe
      print $pipein
      read pipein
      print $pipein
    }
  fi
0:proc subst fd in forked subshell closed in parent
>1
>1

  if [[ ! -e test_pipe ]]; then
    ZTST_skip="mkfifo not available"
  else
    echo 1 | tee >(cat > test_pipe) | paste - test_pipe
  fi
0:proc subst fd in forked subshell closed in parent (external command)
>1	1

  procfunc() {
    cat <(cat "$@")
  }
  procfunc <(echo argument)
0:With /proc/self file descriptors must not be tidied up too early
>argument