#!/usr/bin/env dash
# This file must be sourced in dash:
#
# . `which env_parallel.dash`
#
# after which 'env_parallel' works
#
#
# Copyright (C) 2017
# Ole Tange and Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see
# or write to the Free Software Foundation, Inc., 51 Franklin St,
# Fifth Floor, Boston, MA 02110-1301 USA
env_parallel() {
# based on env_parallel.sh
_names_of_ALIASES() {
for _i in `alias | perl -ne 's/^alias //;s/^(\S+)=.*/$1/ && print' 2>/dev/null`; do
# Check if this name really is an alias
# or just part of a multiline alias definition
if alias $_i >/dev/null 2>/dev/null; then
echo $_i
fi
done
}
_bodies_of_ALIASES() {
# alias may return:
# myalias='definition' (GNU/Linux ash)
# alias myalias='definition' (FreeBSD ash)
# so remove 'alias ' from first line
for _i in "$@"; do
echo 'alias '"`alias $_i | perl -pe '1..1 and s/^alias //'`"
done
}
_names_of_maybe_FUNCTIONS() {
set | perl -ne '/^([A-Z_0-9]+)\s*\(\)\s*\{?$/i and print "$1\n"'
}
_names_of_FUNCTIONS() {
# myfunc is a function
type `_names_of_maybe_FUNCTIONS` |
perl -ne '/^(\S+) is a function$/ and not $seen{$1}++ and print "$1\n"'
}
_bodies_of_FUNCTIONS() {
type "$@" | perl -ne '/^(\S+) is a function$/ or print'
}
_names_of_VARIABLES() {
# This may screw up if variables contain \n and =
set | perl -ne 's/^(\S+)=.*/$1/ and print;'
}
_bodies_of_VARIABLES() {
# Crappy typeset -p
for _i in "$@"
do
perl -e 'print @ARGV' "$_i="
eval echo \"\$$_i\" | perl -e '$/=undef; $a=<>; chop($a); print $a' |
perl -pe 's/[\002-\011\013-\032\\\#\?\`\(\)\{\}\[\]\^\*\<\=\>\~\|\; \"\!\$\&\202-\377]/\\$&/go;'"s/'/\\\'/g; s/[\n]/'\\n'/go;";
echo
done
}
_remove_bad_NAMES() {
# Do not transfer vars and funcs from env_parallel
grep -Ev '^(_names_of_ALIASES|_bodies_of_ALIASES|_names_of_maybe_FUNCTIONS|_names_of_FUNCTIONS|_bodies_of_FUNCTIONS|_names_of_VARIABLES|_bodies_of_VARIABLES|_remove_bad_NAMES|_prefix_PARALLEL_ENV|_get_ignored_VARS|_make_grep_REGEXP|_ignore_UNDERSCORE|_alias_NAMES|_list_alias_BODIES|_function_NAMES|_list_function_BODIES|_variable_NAMES|_list_variable_VALUES|_prefix_PARALLEL_ENV|PARALLEL_TMP)$' |
# Filter names matching --env
grep -E "^$_grep_REGEXP"\$ | grep -vE "^$_ignore_UNDERSCORE"\$ |
# Vars set by /bin/sh
grep -Ev '^(_)$'
}
_get_ignored_VARS() {
perl -e '
for(@ARGV){
$next_is_env and push @envvar, split/,/, $_;
$next_is_env=/^--env$/;
}
if(grep { /^_$/ } @envvar) {
if(not open(IN, "<", "$ENV{HOME}/.parallel/ignored_vars")) {
print STDERR "parallel: Error: ",
"Run \"parallel --record-env\" in a clean environment first.\n";
} else {
chomp(@ignored_vars = );
$vars = join "|",map { quotemeta $_ } "env_parallel", @ignored_vars;
print $vars ? "($vars)" : "(,,nO,,VaRs,,)";
}
}
' -- "$@"
}
# Get the --env variables if set
# --env _ should be ignored
# and convert a b c to (a|b|c)
# If --env not set: Match everything (.*)
_make_grep_REGEXP() {
perl -e '
for(@ARGV){
/^_$/ and $next_is_env = 0;
$next_is_env and push @envvar, split/,/, $_;
$next_is_env = /^--env$/;
}
$vars = join "|",map { quotemeta $_ } @envvar;
print $vars ? "($vars)" : "(.*)";
' -- "$@"
}
_which() {
# type returns:
# bash is a tracked alias for /bin/bash
# true is a shell builtin
# which is /usr/bin/which
# aliased to `alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
# Return 0 if found, 1 otherwise
type "$@" |
perl -pe '$exit += (s/ aliased to .*// ||
s/ is a shell builtin// ||
s/.* is (a tracked alias for )?//);
END { exit not $exit }'
}
if _which parallel >/dev/null; then
true parallel found in path
else
echo 'env_parallel: Error: parallel must be in $PATH.' >&2
return 255
fi
# Grep regexp for vars given by --env
_grep_REGEXP="`_make_grep_REGEXP \"$@\"`"
# Deal with --env _
_ignore_UNDERSCORE="`_get_ignored_VARS \"$@\"`"
# --record-env
if perl -e 'exit grep { /^--record-env$/ } @ARGV' -- "$@"; then
true skip
else
(_names_of_ALIASES;
_names_of_FUNCTIONS;
_names_of_VARIABLES) |
cat > $HOME/.parallel/ignored_vars
return 0
fi
# Grep alias names
_alias_NAMES="`_names_of_ALIASES | _remove_bad_NAMES | xargs echo`"
_list_alias_BODIES="_bodies_of_ALIASES $_alias_NAMES"
if [ "$_alias_NAMES" = "" ] ; then
# no aliases selected
_list_alias_BODIES="true"
fi
unset _alias_NAMES
# Grep function names
_function_NAMES="`_names_of_FUNCTIONS | _remove_bad_NAMES | xargs echo`"
_list_function_BODIES="_bodies_of_FUNCTIONS $_function_NAMES"
if [ "$_function_NAMES" = "" ] ; then
# no functions selected
_list_function_BODIES="true"
fi
unset _function_NAMES
# Grep variable names
_variable_NAMES="`_names_of_VARIABLES | _remove_bad_NAMES | xargs echo`"
_list_variable_VALUES="_bodies_of_VARIABLES $_variable_NAMES"
if [ "$_variable_NAMES" = "" ] ; then
# no variables selected
_list_variable_VALUES="true"
fi
unset _variable_NAMES
PARALLEL_ENV="`
$_list_alias_BODIES;
$_list_function_BODIES;
$_list_variable_VALUES;
`"
export PARALLEL_ENV
unset _list_alias_BODIES
unset _list_variable_VALUES
unset _list_function_BODIES
unset _grep_REGEXP
unset _ignore_UNDERSCORE
# Test if environment is too big
if `_which true` >/dev/null 2>/dev/null ; then
`_which parallel` "$@";
_parallel_exit_CODE=$?
unset PARALLEL_ENV;
return $_parallel_exit_CODE
else
unset PARALLEL_ENV;
echo "env_parallel: Error: Your environment is too big." >&2
echo "env_parallel: Error: Try running this in a clean environment once:" >&2
echo "env_parallel: Error: env_parallel --record-env" >&2
echo "env_parallel: Error: And the use '--env _'" >&2
echo "env_parallel: Error: For details see: man env_parallel" >&2
return 255
fi
}
parset() {
_parset_parallel_prg=parallel
_parset_main "$@"
}
env_parset() {
_parset_parallel_prg=env_parallel
_parset_main "$@"
}
_parset_main() {
# If $1 contains ',' or space:
# Split on , to get the destination variable names
# If $1 is a single destination variable name:
# Treat it as the name of an array
#
# # Create array named myvar
# parset myvar echo ::: {1..10}
# echo ${myvar[5]}
#
# # Put output into $var_a $var_b $var_c
# varnames=(var_a var_b var_c)
# parset "${varnames[*]}" echo ::: {1..3}
# echo $var_c
#
# # Put output into $var_a4 $var_b4 $var_c4
# parset "var_a4 var_b4 var_c4" echo ::: {1..3}
# echo $var_c4
_parset_name="$1"
if [ "$_parset_name" = "" ] ; then
echo parset: Error: No destination variable given. >&2
echo parset: Error: Try: >&2
echo parset: Error: ' ' parset myarray echo ::: foo bar >&2
return 255
fi
shift
echo "$_parset_name" |
perl -ne 'chomp;for (split /[, ]/) {
# Allow: var_32 var[3]
if(not /^[a-zA-Z_][a-zA-Z_0-9]*(\[\d+\])?$/) {
print STDERR "parset: Error: $_ is an invalid variable name.\n";
print STDERR "parset: Error: Variable names must be letter followed by letters or digits.\n";
$exitval = 255;
}
}
exit $exitval;
' || return 255
if echo "$_parset_name" | grep -E ',| ' >/dev/null ; then
# $1 contains , or space
# Split on , or space to get the names
eval "$(
# Compute results into files
$_parset_parallel_prg --files -k "$@" |
# var1=`cat tmpfile1; rm tmpfile1`
# var2=`cat tmpfile2; rm tmpfile2`
parallel -q echo {2}='`cat {1}; rm {1}`' :::: - :::+ $(
echo "$_parset_name" |
perl -pe 's/,/ /g'
)
)"
else
# $1 contains no space or ,
# => $1 is the name of the array to put data into
# Supported in: bash
# Arrays do not work in: ash dash
eval $_parset_name="( $( $_parset_parallel_prg --files -k "$@" |
perl -pe 'chop;$_="\"\`cat $_; rm $_\`\" "' ) )"
fi
}