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#compdef perl
#
# zsh completion code for the Perl interpreter
# Adam Spiers <adam@spiers.net>
#
# Completions currently based on Perl 5.14.1.
typeset -A opt_args

_perl () {
  _arguments -s \
    '-0-[input record separator ($/)]:$/ in octal or hex (\0, if no argument)' \
    '-a[autosplit mode with -n or -p (splits $_ into @F)]' \
    '-C-[control some unicode features]: :_perl_unicode_flags' \
    "-c[check syntax only (runs BEGIN and END blocks)]" \
    '(   -dt -d: -dt:)-d[run scripts under debugger]' \
    '(-d     -d: -dt:)-dt[run scripts under debugger (debugged code uses threads)]' \
    '(-d -dt     -dt:)-d\:-[run under control of a debugging/tracing module]:debugging/tracing module:_perl_modules --strip-prefix --perl-hierarchy=Devel' \
    '(-d -dt -d:     )-dt\:-[run under control of a debugging/tracing module (debugged coded uses threads)]:debugging/tracing module:_perl_modules --strip-prefix --perl-hierarchy=Devel' \
    '-D-[set debugging flags]: :_perl_debugging_flags' \
    '(1 -E)*-e+[run one line of program]:one line of program' \
    '(1 -e)*-E+[like -e but enable all optional features]:one line of program' \
    '-f[disable executing $Config{sitelib}/sitecustomize.pl at startup]' \
    '-F-[split() pattern for autosplit (-a)]:split() pattern, // is optional' \
    '-h[list help summary]' \
    '-i-[edit <> files in place (make backup if extension supplied)]:backup file extension: ' \
    '*-I-[specify @INC/#include directory (may be used more than once)]:include path:_files -/' \
    '-l-[enable line ending processing, specifies line terminator]:output record separator in octal: ' \
    \*{-m,-M}"-[module.. executes \`use/no module...' before executing your script]:module:_perl_m_opt" \
    "-n[assume 'while (<>) { ... }' loop around your script]" \
    "-p[assume loop like -n but print line also like sed]" \
    "-s[enable some switch parsing for switches after script name]" \
    "-S[look for the script using PATH environment variable]" \
    '(   -T)-t[turn on taint checks but only issue warnings]' \
    '(-t   )-T[turn on taint checks]' \
    "-u[dump core after parsing script]" \
    "-U[allow unsafe operations]" \
    "-v[print version, patchlevel and license]" \
    "-V-[print perl configuration information]:configuration keys:_perl_config_vars" \
    '(   -W -X)-w[turn warnings on for compilation of your script (recommended)]' \
    "(-w    -X)-W[enable all warnings (ignores 'no warnings')]" \
    "(-w -W   )-X[disable all warnings (ignores 'use warnings')]" \
    '-x-[ignore text before #!perl line and optionally cd to directory]:directory to cd to:_files -/' \
    '1:Perl script:_files -g "*.(p[ml]|PL|t)(-.)"' \
    '*::args:= _perl_normal'
}

_perl_normal() {
  local expl
  if [[ -z "$opt_args[(I)-(e|E)]" ]]; then
    shift words
    (( CURRENT-- ))
  fi
  _normal && ret=0
}

_perl_m_opt () {
  compset -P '-'

  if compset -P '*='; then
    _message -e module-arguments 'module arguments, comma separated'
  else
    _perl_modules -S= -q
  fi
}

_perl_config_vars () {
  if (( ! $+_perl_config_vars )); then
    _perl_config_vars=( $(perl -MConfig -e 'print join("\n", keys %Config);') )
  fi

  local add_colon='-P:'
  compset -P '*:' && add_colon=''

  local delimiter='\ '
  (( compstate[quoting] )) && delimiter=' '

  compset -P '* ' && compset -q
  compadd "$expl[@]" $add_colon -S$delimiter -q -a _perl_config_vars
}

_perl_unicode_flags () {
  _values -s '' 'unicode bitmask or flags' \
    'I[  1 STDIN is assumed to be in UTF-8]' \
    'O[  2 STDOUT will be in UTF-8]' \
    'E[  4 STDERR will be in UTF-8]' \
    'S[  7 I + O + E]' \
    'i[  8 UTF-8 is the default PerlIO layer for input streams]' \
    'o[ 16 UTF-8 is the default PerlIO layer for output streams]' \
    'D[ 24 i + o]' \
    'A[ 32 the @ARGV elements are expected to be strings encoded in UTF-8]' \
    'L[ 64 make "IOEioA" conditional on the locale environment variables]' \
    'a[256 set ${^UTF8CACHE} to -1, used for debugging]' \
}

_perl_debugging_flags () {
  _values -s '' 'debugging bitmask or flags' \
    'p[      1 Tokenizing and parsing (with v, displays parse stack)]' \
    's[      2 Stack snapshots (with v, displays all stacks)]' \
    'l[      4 Context (loop) stack processing]' \
    't[      8 Trace execution]' \
    'o[     16 Method and overloading resolution]' \
    'c[     32 String/numeric conversions]' \
    'P[     64 Print profiling info, preprocessor command for -P, source file input state]' \
    'm[    128 Memory and SV allocation]' \
    'f[    256 Format processing]' \
    'r[    512 Regular expression parsing and execution]' \
    'x[   1024 Syntax tree dump]' \
    'u[   2048 Tainting checks]' \
    'U[   4096 Unofficial, User hacking (reserved for private, unreleased use)]' \
    'H[   8192 Hash dump -- usurps values()]' \
    'X[  16384 Scratchpad allocation]' \
    'D[  32768 Cleaning up]' \
    'S[  66536 Thread synchronization]' \
    'T[ 131072 Tokenising]' \
    'R[ 262144 Include reference counts of dumped variables (eg when using -Ds)]' \
    'J[ 524288 Do not s,t,P-debug (Jump over) opcodes within package DB]' \
    'v[1048576 Verbose: use in conjunction with other flags]' \
    'C[2097152 Copy On Write]' \
    'A[4194304 Consistency checks on internal structures]' \
    'q[8388608 quiet - currently only suppresses the "EXECUTING" message]' \
}

_perl "$@"