#compdef ruby irb erb ruby-mri -P (ruby|[ei]rb)[0-9.]# -value-,RUBY(LIB|OPT|PATH),-default-

local curcontext="$curcontext" state line expl desc RUBY ret=1
typeset -A opt_args
local -a opts irb erb all common charsets suf

all=(
  '*-r+[require the library before executing your script]:library name:->library'
  '(--internal-encoding)-U[set internal encoding to UTF-8]'
  '(-E --encoding -K --external-encoding)'{-E+,--encoding=}'[specify default external and internal character encodings]:charset:->charsets'
  '(1 * -)'{-h,--help}'[print help message]'
  '(1 * -)--version[print the version]'
)

common=(
  '*-I+[specify $LOAD_PATH directory (may be used more than once)]:library directory:_files -/'
  '-w[turn warnings on for your script]'
  '-W-[set warning level]:warning level:((0\:silent 1\:medium 2\:verbose))'
  '(-)1:ruby script:_files -g "*.rb(-.)"'
  '*::script argument:= ->normal'
)

opts=(
  '-0-[specify record separator]:input record separator in octal [default \0]'
  '-a[autosplit mode with -n or -p (splits $_ into $F)]'
  '-c[check syntax only]'
  '-C+[cd to directory before executing your script]:directory:_files -/'
  '(-d --debug)'{-d,--debug}'[set debugging flags (set $DEBUG to true)]'
  "(1)*-e+[one line script (several -e's allowed, omit program file)]:one line of script"
  '-F-[split() pattern for autosplit (-a)]:input field separator:'
  '-i-[edit ARGV files in place (make backup if extension supplied)]:suffix for in-place-edit mode:(.bak)'
  '-K-[specifies KANJI (Japanese) code-set]:KANJI encoding:((e\:EUC-JP s\:Shift_JIS u\:UTF-8 N\:None))'
  "-l[assume 'while gets(); ... end' loop around your script]"
  "(-p)-n[assume 'while gets(); ... end' loop around your script]"
  '(-n)-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-[turn on tainting checks]::taint level [1]:((0\:strings\ from\ streams/environment/ARGV\ are\ tainted 1\:no\ dangerous\ operation\ by\ tainted\ value 2\:process/file\ operations\ prohibited 3\:all\ generated\ objects\ are\ tainted 4\:no\ global\ \(non-tainted\)\ variable\ modification/no\ direct\ output))'
  '(-v --verbose)'{-v,--verbose}'[print version number, then turn on verbose mode]'
  '-x-[strip off text before #!ruby line and perhaps cd to directory]:directory:_files -/'
  '(1 * -)--copyright[print the copyright]'
  --{en,dis}'able=[enable or disable features]:feature:(gems did_you_mean rubyopt frozen_string_literal all)'
  \!--{en,dis}able-{gems,rubyopt,all}
  '--dump=[dump debug information]:information:_sequence compadd - insns yydebug parsetree parsetree_with_comment'
  --{external,internal}'-encoding=:charset:->charsets'
  '!'{-y,--yydebug}
  '!--dump=:target:(version copyright usage yydebug syntax parsetree parsetree_with_comment insns)'
)

irb=(
  '-f[suppress read of ~/.irbrc]'
  '(--noinspect)-m[bc mode (load mathn, fraction, matrix)]'
  $opts[(r)*-d\[*]
  '(--noinspect)--inspect[use inspect for output]'
  "(--inspect)--noinspect[don't use inspect for output]"
  '(--noreadline)--readline[use readline extension]'
  "(--readline)--noreadline[don't use readline extension]"
  '(--prompt --prompt-mode --inf-ruby-mode --simple-prompt --noprompt)'{--prompt,--prompt-mode}'[switch prompt mode]:prompt mode:(default simple xmp inf-ruby)'
  '(--prompt --prompt-mode --inf-ruby-mode --simple-prompt --noprompt)'{--inf-ruby-mode,--simple-prompt,--noprompt}
  '--tracer[display trace for each command execution]'
  '--back-trace-limit[set limit for backtraces]:limit [16]:'
  '!--irb_debug:level'
  '--context-mode:n'
  '(--noecho)--echo[show result]'
  "(--echo)--noecho[don't show result]"
  '--single-irb[share self with sub-irb]'
  '(--noverbose)--verbose[show details]'
  "(--verbose)--noverbose[don't show details]"
)

erb=(
  "-P[don't evaluate lines which start with %]"
  '-S[specify safe level for running script]:level:(1 2 3 4)'
  '-T[specify trim mode]:mode [0]:((0\:EOL\ remains 1\:EOL\ removed\ if\ line\ ends\ with\ %\> 2\:EOL\ removed\ if\ line\ starts\ with\ \<%\ and\ ends\ with\ %\> -\:EOL\ is\ removed\ if\ line\ ends\ with\ -%\>,\ leading\ whitespace\ removed\ after\ \<%-))'
  '(-d --debug)'{-d,--debug}'[set debugging flags (set $DEBUG to true)]'
  '-n[used with -x, prepends line number to output]'
  '-x[convert eRuby to Ruby]'
)

case "$service" in
  *RUBY(LIB|PATH)*)
    _dir_list && return 0
  ;;
  *RUBYOPT*)
    compset -q
    words=( fake "$words[@]" )
    (( CURRENT++ ))
    _arguments -C -s : "${(@M)opts:#*-[IdvwrK](|[-+])\[*}" && ret=0
    RUBY=ruby
  ;;
  ruby[0-9.]#)
    RUBY=$words[1]
    _arguments -C -s -S : $opts $all $common && ret=0
  ;;
  irb[0-9.]#)
    RUBY=${words[1]/irb/ruby}
    _arguments -C -s : $irb $all $common && ret=0
  ;;
  erb[0-9.]#)
    RUBY=${words[1]/erb/ruby}
    _arguments -C -s : $erb $all \
      '*:erb file:_files -g "*.erb(-.)"' && ret=0
  ;;
esac

case "$state" in
  normal)
    if (( ! $+opt_args[-e] )); then
      shift words
      (( CURRENT-- ))
    fi
    _normal && ret=0
  ;;
  charsets)
    charsets=( $(_call_program charsets $RUBY -e 'puts\ Encoding.list' 2>/dev/null) )
    # could also add Encoding.aliases.map(&:first) for aliases
    desc='charset'
    if [[ $curcontext = *option-(E|-encoding)-1 ]]; then
      if compset -P '*:'; then
	desc='internal charset'
      else
	desc='external charset'
	compset -S ':*' || suf=( -S: )
      fi
    fi
    _wanted charsets expl $desc compadd $suf -a charsets && ret=0
  ;;
  library)
    local -a dirs
    dirs=( $(_call_program libraries $RUBY -e 'puts\ \$:' 2>/dev/null) ${(s.:.)opt_args[-I]} )
    _wanted libraries expl library _path_files -W dirs && ret=0
  ;;
esac

return ret