src/env_parallel.ash

   1 #!/usr/bin/env ash
   2
   3 # This file must be sourced in ash:
   4 #
   5 #   . env_parallel.ash
   6 #
   7 # after which 'env_parallel' works
   8 #
   9 #
  10 # Copyright (C) 2016-2023 Ole Tange, http://ole.tange.dk and Free
  11 # Software Foundation, Inc.
  12 #
  13 # This program is free software; you can redistribute it and/or modify
  14 # it under the terms of the GNU General Public License as published by
  15 # the Free Software Foundation; either version 3 of the License, or
  16 # (at your option) any later version.
  17 #
  18 # This program is distributed in the hope that it will be useful, but
  19 # WITHOUT ANY WARRANTY; without even the implied warranty of
  20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 # General Public License for more details.
  22 #
  23 # You should have received a copy of the GNU General Public License
  24 # along with this program; if not, see <http://www.gnu.org/licenses/>
  25 # or write to the Free Software Foundation, Inc., 51 Franklin St,
  26 # Fifth Floor, Boston, MA 02110-1301 USA
  27 #
  28 # SPDX-FileCopyrightText: 2021-2023 Ole Tange, http://ole.tange.dk and Free Software and Foundation, Inc.
  29 # SPDX-License-Identifier: GPL-3.0-or-later
  30 # shellcheck disable=SC2006 shell=dash
  31
  32 env_parallel() {
  33     # based on env_parallel.sh
  34
  35     _names_of_ALIASES() {
  36         # alias fails on Unixware 5
  37         for _i in `alias 2>/dev/null | perl -ne 's/^alias //;s/^(\S+)=.*/$1/ && print' 2>/dev/null`; do
  38             # Check if this name really is an alias
  39             # or just part of a multiline alias definition
  40             if alias "$_i" >/dev/null 2>/dev/null; then
  41                 echo "$_i"
  42             fi
  43         done
  44     }
  45     _bodies_of_ALIASES() {
  46         # alias may return:
  47         #   myalias='definition' (GNU/Linux ash)
  48         #   alias myalias='definition' (FreeBSD ash)
  49         # so remove 'alias ' from first line
  50         for _i in "$@"; do
  51                 echo 'alias '"`alias "$_i" | perl -pe '1..1 and s/^alias //'`"
  52         done
  53     }
  54     _names_of_maybe_FUNCTIONS() {
  55         set | perl -ne '/^([A-Z_0-9]+)\s*\(\)\s*\{?$/i and print "$1\n"'
  56     }
  57     _names_of_FUNCTIONS() {
  58         # myfunc is a function
  59         # shellcheck disable=SC2046
  60         LANG=C type `_names_of_maybe_FUNCTIONS` |
  61             perl -ne '/^(\S+) is a function$/ and not $seen{$1}++ and print "$1\n"'
  62     }
  63     _bodies_of_FUNCTIONS() {
  64         LANG=C type "$@" | perl -ne '/^(\S+) is a function$/ or print'
  65     }
  66     _names_of_VARIABLES() {
  67         # This may screw up if variables contain \n and =
  68         set | perl -ne 's/^(\S+?)=.*/$1/ and print;'
  69     }
  70     _bodies_of_VARIABLES() {
  71         # Crappy typeset -p
  72         for _i in "$@"
  73         do
  74             perl -e 'print @ARGV' "$_i="
  75             eval echo "\"\$$_i\"" | perl -e '$/=undef; $a=<>; chop($a); print $a' |
  76                 perl -pe 's/[\002-\011\013-\032\\\#\?\`\(\)\{\}\[\]\^\*\<\=\>\~\|\; \"\!\$\&\202-\377]/\\$&/go;'"s/'/\\\'/g; s/[\n]/'\\n'/go;";
  77             echo
  78         done
  79     }
  80     _ignore_HARDCODED() {
  81         # These names cannot be detected
  82         echo '(_|TIMEOUT|IFS)'
  83     }
  84     _ignore_READONLY() {
  85         # shellcheck disable=SC1078,SC1079,SC2026
  86         readonly | perl -e '@r = map {
  87                 chomp;
  88                 # sh on UnixWare: readonly TIMEOUT
  89                 # ash: readonly var='val'
  90                 # ksh: var='val'
  91                 # mksh: PIPESTATUS[0]
  92                 s/^(readonly )?([^=\[ ]*?)(\[\d+\])?(=.*|)$/$2/ or
  93                 # bash: declare -ar BASH_VERSINFO=([0]="4" [1]="4")
  94                 # zsh: typeset -r var='val'
  95                   s/^\S+\s+\S+\s+(\S[^=]*)(=.*|$)/$1/;
  96                 $_ } <>;
  97             $vars = join "|",map { quotemeta $_ } @r;
  98             print $vars ? "($vars)" : "(,,nO,,VaRs,,)";
  99             '
 100     }
 101     _remove_bad_NAMES() {
 102         # Do not transfer vars and funcs from env_parallel
 103         # shellcheck disable=SC2006
 104         _ignore_RO="`_ignore_READONLY`"
 105         # shellcheck disable=SC2006
 106         _ignore_HARD="`_ignore_HARDCODED`"
 107         # To avoid depending on grep dialect, use Perl version of:
 108         # grep -Ev '^(...)$' |
 109         perl -ne '/^(
 110                      PARALLEL_ENV|
 111                      PARALLEL_TMP|
 112                      _alias_NAMES|
 113                      _bodies_of_ALIASES|
 114                      _bodies_of_FUNCTIONS|
 115                      _bodies_of_VARIABLES|
 116                      _error_PAR|
 117                      _function_NAMES|
 118                      _get_ignored_VARS|
 119                      _grep_REGEXP|
 120                      _ignore_HARD|
 121                      _ignore_HARDCODED|
 122                      _ignore_READONLY|
 123                      _ignore_RO|
 124                      _ignore_UNDERSCORE|
 125                      _list_alias_BODIES|
 126                      _list_function_BODIES|
 127                      _list_variable_VALUES|
 128                      _make_grep_REGEXP|
 129                      _names_of_ALIASES|
 130                      _names_of_FUNCTIONS|
 131                      _names_of_VARIABLES|
 132                      _names_of_maybe_FUNCTIONS|
 133                      _parallel_exit_CODE|
 134                      _prefix_PARALLEL_ENV|
 135                      _prefix_PARALLEL_ENV|
 136                      _remove_bad_NAMES|
 137                      _remove_readonly|
 138                      _variable_NAMES|
 139                      _warning_PAR|
 140                      _which_PAR)$/x and next;
 141             # Filter names matching --env
 142             /^'"$_grep_REGEXP"'$/ or next;
 143             /^'"$_ignore_UNDERSCORE"'$/ and next;
 144             # Remove readonly variables
 145             /^'"$_ignore_RO"'$/ and next;
 146             /^'"$_ignore_HARD"'$/ and next;
 147             print;'
 148     }
 149     _get_ignored_VARS() {
 150         perl -e '
 151             for(@ARGV){
 152                 $next_is_env and push @envvar, split/,/, $_;
 153                 $next_is_env=/^--env$/;
 154             }
 155             if(grep { /^_$/ } @envvar) {
 156                 if(not open(IN, "<", "$ENV{HOME}/.parallel/ignored_vars")) {
 157                     print STDERR "parallel: Error: ",
 158                     "Run \"parallel --record-env\" in a clean environment first.\n";
 159                 } else {
 160                     chomp(@ignored_vars = <IN>);
 161                 }
 162             }
 163             if($ENV{PARALLEL_IGNORED_NAMES}) {
 164                 push @ignored_vars, split/\s+/, $ENV{PARALLEL_IGNORED_NAMES};
 165                 chomp @ignored_vars;
 166             }
 167             $vars = join "|",map { quotemeta $_ } @ignored_vars;
 168             print $vars ? "($vars)" : "(,,nO,,VaRs,,)";
 169             ' -- "$@"
 170     }
 171
 172     # Get the --env variables if set
 173     # --env _ should be ignored
 174     # and convert  a b c  to (a|b|c)
 175     # If --env not set: Match everything (.*)
 176     _make_grep_REGEXP() {
 177         perl -e '
 178             for(@ARGV){
 179                 /^_$/ and $next_is_env = 0;
 180                 $next_is_env and push @envvar, split/,/, $_;
 181                 $next_is_env = /^--env$/;
 182             }
 183             $vars = join "|",map { quotemeta $_ } @envvar;
 184             print $vars ? "($vars)" : "(.*)";
 185             ' -- "$@"
 186     }
 187     _which_PAR() {
 188         # type returns:
 189         #   ll is an alias for ls -l (in ash)
 190         #   bash is a tracked alias for /bin/bash
 191         #   true is a shell builtin (in bash)
 192         #   myfunc is a function (in bash)
 193         #   myfunc is a shell function (in zsh)
 194         #   which is /usr/bin/which (in sh, bash)
 195         #   which is hashed (/usr/bin/which)
 196         #   gi is aliased to `grep -i' (in bash)
 197         #   aliased to `alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
 198         # Return 0 if found, 1 otherwise
 199         LANG=C type "$@" |
 200             perl -pe '$exit += (s/ is an alias for .*// ||
 201                                 s/ is aliased to .*// ||
 202                                 s/ is a function// ||
 203                                 s/ is a shell function// ||
 204                                 s/ is a shell builtin// ||
 205                                 s/.* is hashed .(\S+).$/$1/ ||
 206                                 s/.* is (a tracked alias for )?//);
 207                       END { exit not $exit }'
 208     }
 209     _warning_PAR() {
 210         echo "env_parallel: Warning: $*" >&2
 211     }
 212     _error_PAR() {
 213         echo "env_parallel: Error: $*" >&2
 214     }
 215
 216     if _which_PAR parallel >/dev/null; then
 217         true parallel found in path
 218     else
 219         # shellcheck disable=SC2016
 220         _error_PAR 'parallel must be in $PATH.'
 221         return 255
 222     fi
 223
 224     # Grep regexp for vars given by --env
 225     # shellcheck disable=SC2006
 226     _grep_REGEXP="`_make_grep_REGEXP \"$@\"`"
 227     unset _make_grep_REGEXP
 228
 229     # Deal with --env _
 230     # shellcheck disable=SC2006
 231     _ignore_UNDERSCORE="`_get_ignored_VARS \"$@\"`"
 232     unset _get_ignored_VARS
 233
 234     # --record-env
 235     if perl -e 'exit grep { /^--record-env$/ } @ARGV' -- "$@"; then
 236         true skip
 237     else
 238         (_names_of_ALIASES;
 239          _names_of_FUNCTIONS;
 240          _names_of_VARIABLES) |
 241             cat > "$HOME"/.parallel/ignored_vars
 242         return 0
 243     fi
 244
 245     # --session
 246     if perl -e 'exit grep { /^--session$/ } @ARGV' -- "$@"; then
 247         true skip
 248     else
 249         # Insert ::: between each level of session
 250         # so you can pop off the last ::: at --end-session
 251         # shellcheck disable=SC2006
 252         PARALLEL_IGNORED_NAMES="`echo \"$PARALLEL_IGNORED_NAMES\";
 253           echo :::;
 254           (_names_of_ALIASES;
 255            _names_of_FUNCTIONS;
 256            _names_of_VARIABLES) | perl -ne '
 257             BEGIN{
 258               map { $ignored_vars{$_}++ }
 259                 split/\s+/, $ENV{PARALLEL_IGNORED_NAMES};
 260             }
 261             chomp;
 262             for(split/\s+/) {
 263               if(not $ignored_vars{$_}) {
 264                 print $_,\"\\n\";
 265               }
 266             }
 267             '`"
 268         export PARALLEL_IGNORED_NAMES
 269         return 0
 270     fi
 271     if perl -e 'exit grep { /^--end.?session$/ } @ARGV' -- "$@"; then
 272         true skip
 273     else
 274         # Pop off last ::: from PARALLEL_IGNORED_NAMES
 275         # shellcheck disable=SC2006
 276         PARALLEL_IGNORED_NAMES="`perl -e '
 277           $ENV{PARALLEL_IGNORED_NAMES} =~ s/(.*):::.*?$/$1/s;
 278           print $ENV{PARALLEL_IGNORED_NAMES}
 279         '`"
 280         return 0
 281     fi
 282     # Grep alias names
 283     # shellcheck disable=SC2006
 284     _alias_NAMES="`_names_of_ALIASES | _remove_bad_NAMES | xargs echo`"
 285     _list_alias_BODIES="_bodies_of_ALIASES $_alias_NAMES"
 286     if [ "$_alias_NAMES" = "" ] ; then
 287         # no aliases selected
 288         _list_alias_BODIES="true"
 289     fi
 290     unset _alias_NAMES
 291
 292     # Grep function names
 293     # shellcheck disable=SC2006
 294     _function_NAMES="`_names_of_FUNCTIONS | _remove_bad_NAMES | xargs echo`"
 295     _list_function_BODIES="_bodies_of_FUNCTIONS $_function_NAMES"
 296     if [ "$_function_NAMES" = "" ] ; then
 297         # no functions selected
 298         _list_function_BODIES="true"
 299     fi
 300     unset _function_NAMES
 301
 302     # Grep variable names
 303     # shellcheck disable=SC2006
 304     _variable_NAMES="`_names_of_VARIABLES | _remove_bad_NAMES | xargs echo`"
 305     _list_variable_VALUES="_bodies_of_VARIABLES $_variable_NAMES"
 306     if [ "$_variable_NAMES" = "" ] ; then
 307         # no variables selected
 308         _list_variable_VALUES="true"
 309     fi
 310     unset _variable_NAMES
 311
 312     # shellcheck disable=SC2006
 313     PARALLEL_ENV="`
 314         $_list_alias_BODIES;
 315         $_list_function_BODIES;
 316         $_list_variable_VALUES;
 317     `"
 318     export PARALLEL_ENV
 319     unset _list_alias_BODIES _list_variable_VALUES _list_function_BODIES
 320     unset _bodies_of_ALIASES _bodies_of_VARIABLES _bodies_of_FUNCTIONS
 321     unset _names_of_ALIASES _names_of_VARIABLES _names_of_FUNCTIONS
 322     unset _ignore_HARDCODED _ignore_READONLY _ignore_UNDERSCORE
 323     unset _remove_bad_NAMES _grep_REGEXP
 324     unset _prefix_PARALLEL_ENV
 325     # Test if environment is too big by running 'true'
 326     # shellcheck disable=SC2006,SC2092
 327     if `_which_PAR true` >/dev/null 2>/dev/null ; then
 328         parallel "$@"
 329         _parallel_exit_CODE=$?
 330         # Clean up variables/functions
 331         unset PARALLEL_ENV
 332         unset _which_PAR _which_TRUE
 333         unset _warning_PAR _error_PAR
 334         # Unset _parallel_exit_CODE before return
 335         eval "unset _parallel_exit_CODE; return $_parallel_exit_CODE"
 336     else
 337         unset PARALLEL_ENV;
 338         _error_PAR "Your environment is too big."
 339         _error_PAR "You can try 3 different approaches:"
 340         _error_PAR "1. Run 'env_parallel --session' before you set"
 341         _error_PAR "   variables or define functions."
 342         _error_PAR "2. Use --env and only mention the names to copy."
 343         _error_PAR "3. Try running this in a clean environment once:"
 344         _error_PAR "     env_parallel --record-env"
 345         _error_PAR "   And then use '--env _'"
 346         _error_PAR "For details see: man env_parallel"
 347         return 255
 348     fi
 349 }
 350
 351 parset() {
 352     _parset_PARALLEL_PRG=parallel
 353     _parset_main "$@"
 354 }
 355
 356 env_parset() {
 357     _parset_PARALLEL_PRG=env_parallel
 358     _parset_main "$@"
 359 }
 360
 361 _parset_main() {
 362     # If $1 contains ',' or space:
 363     #   Split on , to get the destination variable names
 364     # If $1 is a single destination variable name:
 365     #   Treat it as the name of an array
 366     #
 367     #   # Create array named myvar
 368     #   parset myvar echo ::: {1..10}
 369     #   echo ${myvar[5]}
 370     #
 371     #   # Put output into $var_a $var_b $var_c
 372     #   varnames=(var_a var_b var_c)
 373     #   parset "${varnames[*]}" echo ::: {1..3}
 374     #   echo $var_c
 375     #
 376     #   # Put output into $var_a4 $var_b4 $var_c4
 377     #   parset "var_a4 var_b4 var_c4" echo ::: {1..3}
 378     #   echo $var_c4
 379
 380     _parset_NAME="$1"
 381     if [ "$_parset_NAME" = "" ] ; then
 382         echo parset: Error: No destination variable given. >&2
 383         echo parset: Error: Try: >&2
 384         echo parset: Error: ' ' parset myarray echo ::: foo bar >&2
 385         return 255
 386     fi
 387     if [ "$_parset_NAME" = "--help" ] ; then
 388         echo parset: Error: Usage: >&2
 389         echo parset: Error: ' ' parset varname GNU Parallel options and command >&2
 390         echo
 391         parallel --help
 392         return 255
 393     fi
 394     if [ "$_parset_NAME" = "--version" ] ; then
 395         # shellcheck disable=SC2006
 396         echo "parset 20231122 (GNU parallel `parallel --minversion 1`)"
 397         echo "Copyright (C) 2007-2023 Ole Tange, http://ole.tange.dk and Free Software"
 398         echo "Foundation, Inc."
 399         echo "License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>"
 400         echo "This is free software: you are free to change and redistribute it."
 401         echo "GNU parallel comes with no warranty."
 402         echo
 403         echo "Web site: https://www.gnu.org/software/parallel"
 404         echo
 405         echo "When using programs that use GNU Parallel to process data for publication"
 406         echo "please cite as described in 'parallel --citation'."
 407         echo
 408         return 255
 409     fi
 410     shift
 411
 412     # Bash: declare -A myassoc=( )
 413     # Zsh: typeset -A myassoc=( )
 414     # Ksh: typeset -A myassoc=( )
 415     # shellcheck disable=SC2039,SC2169
 416     if (typeset -p "$_parset_NAME" 2>/dev/null; echo) |
 417             perl -ne 'exit not (/^declare[^=]+-A|^typeset[^=]+-A/)' ; then
 418         # This is an associative array
 419         # shellcheck disable=SC2006
 420         eval "`$_parset_PARALLEL_PRG -k --_parset assoc,"$_parset_NAME" "$@"`"
 421         # The eval returns the function!
 422     else
 423         # This is a normal array or a list of variable names
 424         # shellcheck disable=SC2006
 425         eval "`$_parset_PARALLEL_PRG -k --_parset var,"$_parset_NAME" "$@"`"
 426         # The eval returns the function!
 427     fi
 428 }