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env_parallel.fish
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#!/usr/bin/env fish
# This file must be sourced in fish:
#
# . (which env_parallel.fish)
#
# after which 'env_parallel' works
#
#
# Copyright (C) 2016-2021 Ole Tange, http://ole.tange.dk 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 <http://www.gnu.org/licenses/>
# or write to the Free Software Foundation, Inc., 51 Franklin St,
# Fifth Floor, Boston, MA 02110-1301 USA
#
# SPDX-FileCopyrightText: 2021 Ole Tange, http://ole.tange.dk and Free Software and Foundation, Inc.
# SPDX-License-Identifier: GPL-3.0-or-later
# If you are a fisherman feel free to improve the code
#
# The code needs to deal with variables like:
# set funky (perl -e 'print pack "c*", 2..254')
#
# Problem:
# Tell the difference between:
# set tmp "a' 'b' 'c"
# set tmparr1 "a' 'b" 'c'
# set tmparr2 'a' "b' 'c"
# The output from `set` is exactly the same.
# Solution:
# for-loop for each variable. Each value is separated with a
# separator.
function env_parallel
# env_parallel.fish
# --session
perl -e 'exit grep { /^--session/ } @ARGV' -- $argv; or begin;
setenv PARALLEL_IGNORED_NAMES (
begin;
functions -n
set -n;
end | perl -pe 's/\n/,/g';
)
return 0
end;
setenv PARALLEL_ENV (
begin;
set _grep_REGEXP (
begin;
perl -e '
for(@ARGV){
/^_$/ and $next_is_env = 0;
$next_is_env and push @envvar, split/,/, $_;
$next_is_env = /^--env$/;
}
$vars = join "|",map { quotemeta $_ } @envvar;
print $vars ? "($vars)" : "(.*)";
' -- $argv;
end;
)
# Deal with --env _
set _ignore_UNDERSCORE (
begin;
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 = <IN>);
}
}
if($ENV{PARALLEL_IGNORED_NAMES}) {
push @ignored_vars, split/,/, $ENV{PARALLEL_IGNORED_NAMES};
chomp @ignored_vars;
}
$vars = join "|",map { quotemeta $_ } @ignored_vars;
print $vars ? "($vars)" : "(,,nO,,VaRs,,)";
' -- $argv;
end;
)
# --record-env
perl -e 'exit grep { /^--record-env$/ } @ARGV' -- $argv; or begin;
begin;
functions -n | perl -pe 's/,/\n/g';
set -n;
end | cat > $HOME/.parallel/ignored_vars;
end;
# Export function definitions
# Keep the ones from --env
# Ignore the ones from ~/.parallel/ignored_vars
# Dump each function defition
# Replace \001 with \002 because \001 is used by env_parallel
# Convert \n to \001
functions -n | perl -pe 's/,/\n/g' | \
grep -Ev '^(PARALLEL_ENV|PARALLEL_TMP)$' | \
grep -E "^$_grep_REGEXP"\$ | grep -vE "^$_ignore_UNDERSCORE"\$ | \
while read d; functions $d; end | \
perl -pe 's/\001/\002/g and not $printed++ and print STDERR
"env_parallel: Warning: ASCII value 1 in functions is not supported\n";
s/\n/\001/g';
# Convert scalar vars to fish \XX quoting
# Keep the ones from --env
# Ignore the ones from ~/.parallel/ignored_vars
# Ignore read only vars
# Execute 'set' of the content
eval (set -L | \
grep -Ev '^(PARALLEL_TMP)$' | \
grep -E "^$_grep_REGEXP " | grep -vE "^$_ignore_UNDERSCORE " | \
perl -ne 'chomp;
($name,$val)=split(/ /,$_,2);
$name=~/^(HOME|USER|COLUMNS|FISH_VERSION|LINES|PWD|SHLVL|_|
history|status|version)$|\./x and next;
if($val=~/^'"'"'/) { next; }
print "set $name \"\$$name\";\n";
')
# Generate commands to set scalar variables
# Keep the ones from --env
# Ignore the ones from ~/.parallel/ignored_vars
#
begin;
for v in (set -n | \
grep -Ev '^(PARALLEL_TMP)$' | \
grep -E "^$_grep_REGEXP\$" | grep -vE "^$_ignore_UNDERSCORE\$");
# Separate variables with the string: \000
# array_name1 val1\0
# array_name1 val2\0
# array_name2 val3\0
# array_name2 val4\0
eval "for i in \$$v;
echo -n $v \$i;
perl -e print\\\"\\\\0\\\";
end;"
end;
# A final line to flush the last variable in Perl
perl -e print\"\\0\";
end | perl -0 -ne '
# Remove separator string \0
chop;
# Split line into name and value
($name,$val)=split(/ /,$_,2);
# Ignore read-only vars
$name=~/^(HOME|USER|COLUMNS|FISH_VERSION|LINES|PWD|SHLVL|_|
fish_pid|history|hostname|status|version)$/x and next;
# Single quote $val
if($val =~ /[^-_.+a-z0-9\/]/i) {
$val =~ s/\047/\047"\047"\047/g; # "-quote single quotes
$val = "\047$val\047"; # single-quote entire string
$val =~ s/^\047\047|\047\047$//g; # Remove unneeded '' at ends
} elsif ($val eq "") {
$val = "\047\047";
}
if($name ne $last and $last) {
# The $name is different, so this is a new variable.
# Print the last one.
# Separate list elements by 2 spaces
$"=" ";
print "set $last @qval;\n";
@qval=();
}
push @qval,$val;
$last=$name;
'| \
perl -pe 's/\001/\002/g and not $printed++ and print STDERR
"env_parallel: Warning: ASCII value 1 in variables is not supported\n";
s/\n/\001/g'
end;
)
# If --record-env: exit
perl -e 'exit grep { /^--record-env$/ } @ARGV' -- $argv; and parallel $argv;
set _parallel_exit_CODE $status
set -e PARALLEL_ENV
return $_parallel_exit_CODE
end