#!/bin/bash
## -*- encoding: utf-8 -*- vim:tabstop=8:shiftwidth=2
##
## 縦書きジェネレーター
## Copyright (C) 2017 SATOH Fumiyasu @ OSS Technology Corp., Japan
##               <https://github.com/fumiyas/home-commands/blob/master/tate>
##               <https://fumiyas.github.io/>
##               <https://www.osstech.co.jp/cgi-bin/tate>
##
## License: GNU General Public License version 3
##
## Requirements:
##   * bash(1) 4.0, ksh(1) 93u or zsh(1) 4.3
##
## How to install:
##
##   $ mkdir -p $HOME/bin
##   $ cd $HOME/bin
##   $ wget -nv https://raw.githubusercontent.com/fumiyas/home-commands/master/tate
##   $ chmod +x tate
##   $ export PATH="$HOME/bin:$PATH"
##   $ alias banner=tate
##
## Examples for CGI mode:
##
##   $ GATEWAY_INTERFACE=CGI/1.0 QUERY_STRING=s=おっす！ tate
##   Content-Type: text/html; charset=UTF-8
##   ...
##   <pre>
##   お
##   っ
##   す
##   ！
##   </pre><hr>
##   ...
##
## On-line demo site:
##
##   https://www.OSSTech.co.jp/cgi-bin/tate

if [[ ${0##*/} == tate ]] && [[ ${zsh_eval_context-toplevel} == toplevel ]]; then
  set -u

  case "${BASH_VERSION-}" in
  [1-3].*)
    if type zsh >/dev/null 2>&1; then
      unset BASH_VERSION
      exec zsh "$0" ${1+"$@"}
      exit 1
    fi
    echo "${0##*/}: ERROR: bash 4 or later required" 1>&2
    exit 1
    ;;
  esac
fi

typeset TATE_arg0="$0"
typeset TATE_copyright='(C) 2017 SATOH Fumiyasu @ OSS Technology Corp., Japan'
typeset TATE_url='https://github.com/fumiyas/home-commands/blob/master/tate'
typeset TATE_lang_orig TATE_lang
typeset -A TATE_vc_map

## ======================================================================

function TATE_die {
  TATE_echo_command "${TATE_arg0##*/}: ERROR: $1" 1>&2
  TATE_echo_command 1>&2
  exit "${2-1}"
}

function TATE_init {
  if [[ -n ${ZSH_VERSION-} ]]; then
    setopt SH_WORD_SPLIT
    setopt BSD_ECHO
    setopt KSH_GLOB
    setopt KSH_ARRAYS
  elif [[ -n ${BASH_VERSION-} ]]; then
    shopt -u xpg_echo
  else ## ksh
    if [[ $(echo -n) == -n ]]; then
      alias echo='print -r'
    fi
  fi

  typeset locale lang_ja lang
  TATE_lang_orig="${LANG-}"
  if [[ ${TATE_lang_orig#*.} != @(UTF-8|utf-8|UTF8|utf8) ]]; then
    if type locale >/dev/null 2>&1; then
      while read -r locale; do
	if [[ ${locale#*.} == @(UTF-8|utf-8|UTF8|utf8) ]]; then
	  if [[ ${locale%.*} == ja_JP ]]; then
	    lang_ja="$locale"
	  else
	    lang="$locale"
	  fi
	fi
      done < <(locale -a)
    fi
  fi
  TATE_lang="${lang_ja-${lang-ja_JP.UTF-8}}"

  if [[ -n ${ZSH_VERSION-} ]]; then
    TATE_vc_map=()
  else
    TATE_vc_map=
  fi
  TATE_vc_map[ ]='　'
  TATE_vc_map[↑]='→'
  TATE_vc_map[↓]='←'
  TATE_vc_map[←]='↑'
  TATE_vc_map[→]='↓'
  TATE_vc_map[。]='︒'
  TATE_vc_map[、]='︑'
  TATE_vc_map[ー]='｜'
  TATE_vc_map[─]='｜'
  TATE_vc_map[−]='｜'
  TATE_vc_map[－]='｜'
  TATE_vc_map[—]='︱'
  TATE_vc_map[〜]='∫'
  TATE_vc_map[～]='∫'
  TATE_vc_map[／]='＼'
  TATE_vc_map[…]='︙'
  TATE_vc_map[‥]='︰'
  TATE_vc_map[︙]='…'
  TATE_vc_map[：]='︓'
  TATE_vc_map[:]='︓'
  TATE_vc_map[；]='︔'
  TATE_vc_map[;]='︔'
  TATE_vc_map[＝]='॥'
  TATE_vc_map[=]='॥'
  TATE_vc_map[（]='︵'
  TATE_vc_map[\(]='︵'
  TATE_vc_map[）]='︶'
  TATE_vc_map[\)]='︶'
  TATE_vc_map[［]='﹇'
  TATE_vc_map[\[]='﹇'
  TATE_vc_map[］]='﹈'
  TATE_vc_map[\]]='﹈'
  TATE_vc_map[｛]='︷'
  TATE_vc_map[\{]='︷'
  TATE_vc_map[＜]='︿'
  TATE_vc_map[\<]='︿'
  TATE_vc_map[＞]='﹀'
  TATE_vc_map[\>]='﹀'
  TATE_vc_map[｝]='︸'
  TATE_vc_map[\}]='︸'
  TATE_vc_map[「]='﹁'
  TATE_vc_map[」]='﹂'
  TATE_vc_map[『]='﹃'
  TATE_vc_map[』]='﹄'
  TATE_vc_map[【]='︻'
  TATE_vc_map[】]='︼'
  TATE_vc_map[〖]='︗'
  TATE_vc_map[〗]='︘'
  TATE_vc_map[｢]='﹁'
  TATE_vc_map[｣]='﹂'
  TATE_vc_map[-]='| '
  TATE_vc_map[ｰ]='| '
  TATE_vc_map[_]='| '
  TATE_vc_map[,]="︐"
  TATE_vc_map[､]='︑'
}

function _TATE_fill_string_by_char {
  typeset str char
  str="$1"; shift
  char="$1"; shift

  ## Why bash on ja_JP.UTF-8 locale matches '[¥]' with '︙' (and others?)
  #str="${str//[ -~｡-ﾟ¢£¥¦¬¯]/$char}"
  str="${str//[ -~｡-ﾟ¢£¦¬¯]/$char}"
  str="${str//¥/$char}"
  str="${str//[! ]/$char$char}"

  echo "$str"
}

function _TATE_string_width {
  typeset str
  str=$(_TATE_fill_string_by_char "$1" ' ')

  echo "${#str}"
}

function TATE_echo_vertical {
  typeset opt

  while [[ $# -gt 0 ]]; do
    opt="$1"; shift

    case "$opt" in
    --)
      break
      ;;
    -*)
      TATE_die "Invalid option: $opt"
      ;;
    *)
      set -- "$opt" ${1+"$@"}
      break
      ;;
    esac
  done

  export LANG="$TATE_lang"

  typeset -a lines=()
  typeset line line_n
  typeset script script_n trailer trailer2 letter next
  script_n=0
  for script in ${1+"$@"}; do
    line_n=0
    trailer="$script"

    while [[ -n $script ]]; do
      trailer="${trailer#?}"
      letter="${script%$trailer}"
      script="${script#?}"
      if [[ -n ${TATE_vc_map[$letter]-} ]]; then
	line="${TATE_vc_map[$letter]}"
      else
	trailer2="${trailer#?}"
	next="${script%$trailer2}"
	if [[ $next == @(ﾞ|ﾟ) ]] || [[ $letter$next == @([\?!][\?!]) ]]; then
	  line="$letter$next"
	  trailer="$trailer2"
	  script="${script#?}"
	else
	  line="$letter"
	fi
      fi

      if [[ -n "${lines[$line_n]-}" ]]; then
	if [[ $(_TATE_string_width "$line") -eq 1 ]]; then
	  line+=" "
	fi
	lines[$line_n]="$line ${lines[$line_n]}"
      else
	lines[$line_n]="$line"
      fi
      let line_n+=1
    done

    while [[ $line_n -lt ${#lines[@]} ]]; do
      lines[$line_n]="　 ${lines[$line_n]}"
      let line_n+=1
    done

    let script_n+=1
  done

  for line in ${lines[@]+"${lines[@]}"}; do
    echo "$line"
  done

  export LANG="$TATE_lang_orig"
}

function TATE_echo_command_help {
  {
    cat <<EOT
Usage: ${TATE_arg0##*/} [OPTIONS] [SCRIPT ...]

Options:
 --help
    Print this message
 -t, --tweet
    Tweet in Twitter
 -s, --read-stdin
    Read scripts from stdin
EOT
  }
}

function TATE_echo_command {
  typeset opt
  typeset read_stdin
  typeset tweet

  while [[ $# -gt 0 ]]; do
    opt="$1"; shift

    ## -ovalue → -o value
    if [[ -z "${opt##-[phf]?*}" ]]; then
      set -- "${opt#??}" ${1+"$@"}
      opt="${opt%$1}"
    ## -abc → -a -bc
    elif [[ -z "${opt##-[!-]?*}" ]]; then
      set -- "-${opt#??}" ${1+"$@"}
      opt="${opt%${1#-}}"
    ## --option=value → --option value
    elif [[ -z "${opt##--*=*}" ]]; then
      set -- "${opt#--*=}" ${1+"$@"}
      opt="${opt%%=*}"
    fi

    case "$opt" in
    --help)
      TATE_echo_command_help
      exit 0
      ;;
    -s|--read-stdin)
      read_stdin="set"
      ;;
    -t|--tweet)
      tweet="set"
      ;;
    --)
      break
      ;;
    -*)
      TATE_die "Invalid option: $opt"
      ;;
    *)
      set -- "$opt" ${1+"$@"}
      break
      ;;
    esac
  done

  typeset -a sd_opts=()

  if [[ -n ${read_stdin-} ]]; then
    while IFS= read -r line; do
      set -- ${1+"$@"} "$line"
    done
  fi

  if [[ $# -eq 0 ]]; then
    set -- '気軽に「殺す」と' 'ツイートできる、' 'そんな素敵なソリューションを' 'ご提供！(無保証)'
  fi

  typeset sd=$(TATE_echo_vertical ${sd_opts[@]+"${sd_opts[@]}"} -- ${1+"$@"})

  if [[ -n ${tweet-} ]]; then
    if [[ $sd = @( *) ]]; then
      sd=".${sd# }"
    elif [[ $sd = @(　*) ]]; then
      sd="．${sd#　}"
    fi
    Tweet_init
    Tweet_command "$sd"
  else
    echo "$sd"
  fi
}

function _TATE_escape_html {
  if [[ -n ${1+set} ]]; then
    echo "$1"
  else
    cat
  fi \
  |sed \
    -e 's/&/\&amp;/g;' \
    -e 's/</\&lt;/g;' \
    -e 's/>/\&gt;/g;' \
  ;
}

function _TATE_urlencode {
  ## FIXME: Unsafe?
  if [[ -n ${1+set} ]]; then
    echo "$1"
  else
    cat
  fi \
  |sed \
    -e 's/%/%25/g;' \
    -e 's/ /%20/g;' \
    -e 's/#/%23/g;' \
    -e 's/&/%26/g;' \
    -e 's/+/%2B/g;' \
    -e 's/;/%3B/g;' \
    -e 's/=/%3D/g;' \
    -e 's/?/%3F/g;' \
    -e 's/\\/%5C/g;' \
    -e 's/\^/%5E/g;' \
    -e 's/{/%7B/g;' \
    -e 's/|/%7C/g;' \
    -e 's/}/%7D/g;' \
    -e 's/~/%7E/g;' \
  ;
}

function _TATE_urldecode {
  ## FIXME: Support ksh
  echo -e "$(echo "$1" |sed 's/+/ /g;s/%\(..\)/\\x\1/g;')"
}

function TATE_echo_cgi {
  typeset query="${QUERY_STRING-}"
  typeset param value
  typeset tweet text
  typeset -a prefaces=()
  typeset -a scripts=()

  while [[ -n $query ]]; do
    param="${query%%&*}"
    ## '\' is workaround for zsh 4.3.x bug that causes "* not found" error
    name="$(_TATE_urldecode "${param%%\=*}")"
    value="$(_TATE_urldecode "${param#*=}")"

    case "$name" in
    o|options)
      case "$value" in
      text)
	text="checked"
	;;
      esac
      ;;
    p|prefaces)
      while IFS= read -r line; do
	prefaces+=("${line%
}")
      done < <(echo "$value")
      ;;
    s|scripts)
      while IFS= read -r line; do
	scripts+=("${line%
}")
      done < <(echo "$value")
      ;;
    tweet)
      tweet="set"
      ;;
    esac

    if [[ -n ${query##*&*} ]]; then
      break
    fi
    query="${query#*&}"
  done

  set --;
  if [[ ${#scripts[@]} -eq 1 ]] && [[ -z ${scripts[0]} ]]; then
    set -- ${1+"$@"} -- '縦書きジェネレーター'
  else
    set -- ${1+"$@"} -- ${scripts[@]+"${scripts[@]}"}
  fi

  if [[ -n ${tweet-} ]]; then
    echo -n 'Location: https://twitter.com/intent/tweet?text='
    TATE_echo_command "$@" \
    |while IFS= read -r line; do
      echo -n "$line" |_TATE_urlencode
      echo -n '%0A'
    done
    echo -n 'https://t.co/yjkVpkGJfB' |_TATE_urlencode
    echo
    echo
  elif [[ -n ${text-} ]]; then
    echo 'Content-Type: text/plain; charset=UTF-8'
    echo
    for preface in ${prefaces[@]+"${prefaces[@]}"}; do
      echo "$preface"
    done
    TATE_echo_command "$@"
  else
    echo 'Content-Type: text/html; charset=UTF-8'
    echo
    echo \
      '<html>' \
      '<head><title>縦書きジェネレーター</title></head>' \
      '<style type="text/css"><!--' \
      '.ul { text-decoration:underline; }' \
      '--></style>' \
      '<body><h1>縦書きジェネレーター</h1>' \
      '<form action="./tate" method="GET">' \
      ;
    echo -n '<textarea name="scripts" cols="80" rows="4" tabindex="1">'
    for script in ${scripts[@]+"${scripts[@]}"}; do
      _TATE_escape_html "$script"
    done
    echo '</textarea><br />'
    echo '<label>' \
      '<input type="checkbox" name="options" value="text" accesskey="r" ' \
      ">テキスト形式(<span class='ul'>R</span>)</label>"
    echo '<br />'
    echo '<input type="submit" name="generate" value="＞　ジェネレート　＜" tabindex="2">'
    echo '<input type="submit" name="tweet" value="＞　ツイート　＜" tabindex="2">'
    echo '<br />'
    echo '</form>'
    echo '<!--'
    echo "[$(_TATE_escape_html "$*")]"
    echo '-->'
    echo '<pre>'
    for preface in ${prefaces[@]+"${prefaces[@]}"}; do
      _TATE_escape_html "$preface"
    done
    TATE_echo_command "$@" |_TATE_escape_html
    echo '</pre><hr>'
    _TATE_escape_html "$TATE_copyright"
    echo '<br />'
    echo "<a href='$(_TATE_escape_html "$TATE_url")'>$(_TATE_escape_html "$TATE_url")</a>"
    echo '<br>'
    echo "${TATE_CGI_FOOTER_HTML-}"
    echo '</body></html>'
  fi
}

## ======================================================================

: ${HOME="/nonexistent"}

TWEET_CONF="${TATE_CONF-$HOME/.tate.conf}"
TWEET_OAUTH_CONSUMER_KEY="${TATE_OAUTH_CONSUMER_KEY-bVfVsZ8iCW2hsUFa5PL8Vx4LC}"
TWEET_OAUTH_CONSUMER_SECRET="${TATE_OAUTH_CONSUMER_SECRET-9Tj3rGV2XW9J2tMElQDjVod9XMORgR9ctBlKGvYCDUsowoYHyT}"

## Import tweet.sh from https://github.com/fumiyas/Tweet.sh

typeset Tweet_arg0="$0"
typeset Tweet_lang=''
typeset Tweet_conf_file="${TWEET_CONF-$HOME/.tweet.conf}"
typeset Tweet_api_host="api.twitter.com"
typeset Tweet_api_url="https://$Tweet_api_host/1.1"
typeset Tweet_api_url_request_token="https://$Tweet_api_host/oauth/request_token"
typeset Tweet_api_url_authorize_token="https://$Tweet_api_host/oauth/authorize"
typeset Tweet_api_url_access_token="https://$Tweet_api_host/oauth/access_token"
typeset Tweet_oauth_consumer_key="${TWEET_OAUTH_CONSUMER_KEY-C7IpNPso1IYdCweXYaJ0Q}"
typeset Tweet_oauth_consumer_secret="${TWEET_OAUTH_CONSUMER_SECRET-LAsLscqNC4kBaDW8EtmxMIVCkY8nsw07NaN5PNBYuY}"
typeset Tweet_oauth_access_token=''
typeset Tweet_oauth_access_token_secret=''
typeset Tweet_script_limit='140'
typeset Tweet_c_lf='
'

function Tweet_error {
  echo "${Tweet_arg0##*/}: ERROR: $1" 1>&2
}

function HTTP_browser {
  typeset url="$1"; shift
  typeset open=

  case $(uname) in
  Darwin)
    open="open"
    ;;
  CYGWIN_*)
    open="cygstart"
    ;;
  *)
    if [[ -f /etc/debian_version ]]; then
      open="sensible-browser"
    elif type xdg-open >/dev/null 2>&1; then
      open="xdg-open"
    elif [[ ${XDG_CURRENT_DESKTOP-} == GNOME || -n ${GNOME_DESKTOP_SESSION_ID-} ]] ; then
      open="gnome-open"
    elif [[ ${XDG_CURRENT_DESKTOP-} == KDE || ${KDE_FULL_SESSION-} == true ]] ; then
      open="kde-open"
    else
      typeset browsers="${BROWSER-}"
      if [[ -z $browsers ]]; then
	browsers="www-browser:links2:elinks:links:lynx:w3m"
	if [[ -n ${DISPLAY-} ]]; then
	  browsers="x-www-browser:firefox:seamonkey:mozilla:epiphany:konqueror:chromium:chromium-browser:google-chrome:$browsers"
	fi
      fi

      typeset ifs_save="$IFS"
      typeset found=
      IFS=:
      for open in $browsers; do
	if type "$open" >/dev/null 2>&1; then
	  found=set
	  break
	fi
      done
      IFS="$ifs_save"

      if [[ -z $found ]]; then
	## FIXME: Print error message
	return 1
      fi
    fi
    ;;
  esac

  "$open" "$url"

  return $?
}

function HTTP_pencode {
  if [[ -n ${1+set} ]]; then
    typeset in="${1-}"; shift
  else
    typeset in
    IFS= read -r in
  fi

  typeset LC_ALL='C'
  typeset out=
  typeset char
  while [[ -n "$in" ]]; do
    char="${in:0:1}"
    case "$char" in
    [a-zA-Z0-9\-._~])
      out+="$char"
      ;;
    *)
      out+=$(printf '%%%02X' "'$char")
      ;;
    esac
    in="${in:1}"
  done

  echo -n "$out"
}

function HTTP_pdecode {
  typeset in="${1//\\/\\\\}"; shift

  printf "${in//\%/\\x}"
}

function HTTPS_request {
  typeset url="$1"; shift
  typeset method="$1"; shift

  typeset url_tmp
  #typeset url_scheme="${url%%://*}"
  url_tmp="${url#*://}"
  typeset url_path="/${url_tmp#*/}"
  url_tmp="${url_tmp%%/*}"
  typeset url_host="${url_tmp%%:*}"
  if [[ $url_tmp == @(*:*) ]]; then
    typeset url_port="${url_tmp#*:}"
  else
    typeset url_port='443'
  fi

  typeset line
  typeset -l line_lower
  typeset cert_verify_error= http_ver= rcode= rmessage= content_type= body=

  {
    while IFS= read -r line; do
      line="${line%
}"
      if [[ $line == HTTP/* ]]; then
	http_ver="${line%% *}"
	line="${line#* }"
	rcode="${line%% *}"
	rmessage="${line#* }"
	break
      fi
      if [[ $line == 'verify error':* ]]; then
	cert_verify_error="$line"
      fi
    done

    while IFS= read -r line; do
      line="${line%
}"
      [[ -z $line ]] && break
      line_lower="$line"
      case "$line_lower" in
      content-type:*)
	content_type="${line#*: }"
	;;
      esac
    done
    while IFS= read -r line; do
      line="${line%
}"
      body+="$line$Tweet_c_lf"
    done
    body+="$line"
  } < <(
    {
      echo "$method $url_path HTTP/1.1"
      echo "Host: $url_host"
      echo "Connection: close"
      if [[ $method == 'POST' ]]; then
	echo 'Content-Type: application/x-www-form-urlencoded'
      fi
      while [[ $# -gt 0 ]]; do
	[[ $1 == '--' ]] && { shift; break; }
	echo "$1"
	shift
      done
      typeset query="${1-}"
      typeset LC_ALL='C'
      echo "Content-Length: ${#query}"
      echo
      echo -n "$query"
    } \
    |openssl s_client \
      -connect "$url_host:$url_port" \
      -servername "$url_host" \
      -verify_hostname "$url_host" \
      -no_tls1 \
      -no_ssl3 \
      -crlf \
      -quiet \
      2>&1 \
    ;
  )

  typeset rc='0'

  if [[ -n $cert_verify_error ]]; then
    rcode='500'
    rmessage="Invalid server certificate: $cert_verify_error"
    rc='1'
  elif [[ $rcode != 200 ]]; then
    rc='1'
  fi

  echo "$rcode $rmessage"
  echo "$content_type"
  echo
  echo -n "$body"

  return "$rc"
}

function HTTP_response_extract {
  typeset response="$1"; shift
  typeset name="$1"; shift
  typeset value=

  value="${response#*\&$name=}"
  value="${value#$name=}"
  if [[ $value == "$response" ]]; then
    return 1
  fi
  value="${value%%\&*}"

  echo -n "$value"
  return 0
}

function OAuth_nonce {
  printf '%04x%04x%04x%04x%04x%04x%04x%04x' \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    $RANDOM \
    ;
}

function OAuth_timestamp {
  date +%s
}

function OAuth_generate {
  typeset realm="$1"; shift
  typeset consumer_key="$1"; shift
  typeset consumer_secret="$1"; shift
  typeset token="$1"; shift
  typeset token_secret="$1"; shift
  typeset callback="$1"; shift
  typeset url="$1"; shift
  typeset method="$1"; shift

  typeset hmac_key="$consumer_secret&$token_secret"
  typeset -a oauth=(
    "oauth_consumer_key=$consumer_key"
    "oauth_signature_method=HMAC-SHA1"
    "oauth_version=1.0"
    "oauth_nonce=$(OAuth_nonce)"
    "oauth_timestamp=$(OAuth_timestamp)"
    ${token:+"oauth_token=$token"}
    ${callback:+"oauth_callback=$callback"}
  )

  typeset oauth_string
  oauth_string=$(
    echo -n "$method&"
    HTTP_pencode "$url"
    echo -n '&'

    for pv in "$@" "${oauth[@]}"; do
      echo "$(HTTP_pencode "${pv%%=*}") $(HTTP_pencode "${pv#*=}")"
    done \
    |sort \
    |sed 's/ /%3D/;s/$/%26/' \
    |tr -d '\n' \
    |sed 's/%26$//' \
    ;
  )
  typeset oauth_signature
  oauth_signature=$(
    echo -n "$oauth_string" \
    |openssl sha1 -hmac "$hmac_key" -binary \
    |openssl base64 \
    |HTTP_pencode \
    ;
  )

  typeset query=
  while [[ $# -gt 0 ]]; do
    query+="$1"
    [[ $# -gt 1 ]] && query+='&'
    shift
  done

  echo "Authorization: OAuth${realm:+ realm=$realm,}"
  typeset pv
  for pv in "${oauth[@]}"; do
    echo " $pv,"
  done
  echo " oauth_signature=$oauth_signature"
}

function Tweet_string_length {
  typeset LC_ALL="$Tweet_lang"
  echo "${#1}"
}

function Tweet_init {
  if [[ -n ${ZSH_VERSION-} ]]; then
    setopt BSD_ECHO
    setopt KSH_GLOB
    setopt TYPESET_SILENT
  elif [[ -n ${BASH_VERSION-} ]]; then
    shopt -u xpg_echo
  else ## ksh
    if [[ $(echo -n) == -n ]]; then
      alias echo='print -r'
    fi
  fi

  typeset lang_orig="${LANG-}"
  typeset locale lang_ja lang
  if [[ ${lang_orig#*.} != @(UTF-8|utf-8|UTF8|utf8) ]]; then
    if type locale >/dev/null 2>&1; then
      while read -r locale; do
	if [[ ${locale#*.} == @(UTF-8|utf-8|UTF8|utf8) ]]; then
	  if [[ ${locale%.*} == ja_JP ]]; then
	    lang_ja="$locale"
	  else
	    lang="$locale"
	  fi
	fi
      done < <(locale -a)
    fi
  fi
  Tweet_lang="${lang_ja-${lang-ja_JP.UTF-8}}"
}

function Tweet_authorize {
  if [[ -n $Tweet_oauth_access_token && -n $Tweet_oauth_access_token_secret ]]; then
    return 0
  fi

  echo "No OAuth access token and/or secret for Twitter access configured."
  echo
  echo "I'll open Twitter site by a WWW browser to get OAuth access token"
  echo "and secret. Please authorize this application and get a PIN code"
  echo "on Twitter site."
  echo
  echo -n "Press Enter key to open Twitter site..."
  read
  echo

  typeset oauth
  oauth=$(
    OAuth_generate \
      "$Tweet_api_url" \
      "$Tweet_oauth_consumer_key" \
      "$Tweet_oauth_consumer_secret" \
      '' \
      '' \
      '' \
      "$Tweet_api_url_request_token" \
      "POST" \
      ;
  )

  typeset response
  response=$(
    HTTPS_request \
      "$Tweet_api_url_request_token" \
      "POST" \
      "$oauth" \
      ;
  )
  typeset rc="$?"
  if [[ $rc -ne 0 ]]; then
    Tweet_error "OAuth request token failed: ${response%%$Tweet_c_lf*}"
    return 1
  fi

  typeset body="${response#*$Tweet_c_lf$Tweet_c_lf}"
  typeset oauth_token=$(HTTP_response_extract "$body" oauth_token)
  typeset oauth_token_secret=$(HTTP_response_extract "$body" oauth_token_secret)

  HTTP_browser "$Tweet_api_url_authorize_token?oauth_token=$oauth_token"

  echo -n 'Enter PIN code: '
  typeset pin=
  read -r pin
  echo

  typeset oauth
  oauth=$(
    OAuth_generate \
      "$Tweet_api_url" \
      "$Tweet_oauth_consumer_key" \
      "$Tweet_oauth_consumer_secret" \
      "$oauth_token" \
      "$oauth_token_secret" \
      '' \
      "$Tweet_api_url_access_token" \
      "POST" \
      "oauth_verifier=$pin" \
      ;
  )

  typeset response
  response=$(
    HTTPS_request \
      "$Tweet_api_url_access_token" \
      "POST" \
      "$oauth" \
      -- \
      "oauth_verifier=$pin" \
      ;
  )
  typeset rc="$?"
  if [[ $rc -ne 0 ]]; then
    Tweet_error "OAuth access token failed: ${response%%$Tweet_c_lf*}"
    return 1
  fi

  typeset body="${response#*$Tweet_c_lf$Tweet_c_lf}"
  Tweet_oauth_access_token=$(HTTP_response_extract "$body" oauth_token)
  Tweet_oauth_access_token_secret=$(HTTP_response_extract "$body" oauth_token_secret)

  if [[ ! -f "$Tweet_conf_file" ]]; then
    echo "Saving OAuth consumer key and secret into $Tweet_conf_file..."
    (umask 0077; touch "$Tweet_conf_file") || return 1
    echo "oauth_consumer_key='$Tweet_oauth_consumer_key'" >>"$Tweet_conf_file"
    echo "oauth_consumer_secret='$Tweet_oauth_consumer_secret'" >>"$Tweet_conf_file"
  fi
  echo "Saving OAuth access token and secret into $Tweet_conf_file..."
  echo "oauth_access_token='$Tweet_oauth_access_token'" >>"$Tweet_conf_file"
  echo "oauth_access_token_secret='$Tweet_oauth_access_token_secret'" >>"$Tweet_conf_file"

  return 0
}

function Tweet_tweet {
  typeset script="$1"; shift

  typeset script_len=$(Tweet_string_length "$script")
  if [[ $script_len -gt $Tweet_script_limit ]]; then
    Tweet_error "Script too long (>$Tweet_script_limit) to tweet: $script_len"
    return 1
  fi

  typeset query
  query="status=$(HTTP_pencode "$script")"

  typeset oauth
  oauth=$(
    OAuth_generate \
      "$Tweet_api_url" \
      "$Tweet_oauth_consumer_key" \
      "$Tweet_oauth_consumer_secret" \
      "$Tweet_oauth_access_token" \
      "$Tweet_oauth_access_token_secret" \
      '' \
      "$Tweet_api_url/statuses/update.json" \
      "POST" \
      "$query" \
      ;
  )

  typeset response
  response=$(
    HTTPS_request \
      "$Tweet_api_url/statuses/update.json" \
      "POST" \
      "$oauth" \
      -- \
      "$query" \
      ;
  )
  typeset rc="$?"
  if [[ $rc -ne 0 ]]; then
    Tweet_error "Tweet failed: ${response%%$Tweet_c_lf*}"
    return 1
  fi

  typeset body="${response#*$Tweet_c_lf$Tweet_c_lf}"
}

function Tweet_command_help {
  echo "Usage: $0 SCRIPT"
  exit 0
}

function Tweet_command {
  if [[ $# -ne 1 ]]; then
    Tweet_command_help
    exit 0
  fi

  if [[ -f "$Tweet_conf_file" ]]; then
    . "$Tweet_conf_file" || exit 1
  fi

  if [[ -n ${oauth_consumer_key-} ]]; then
    Tweet_oauth_consumer_key="$oauth_consumer_key"
  fi
  if [[ -n ${oauth_consumer_secret-} ]]; then
    Tweet_oauth_consumer_secret="$oauth_consumer_secret"
  fi
  if [[ -n ${oauth_access_token-} ]]; then
    Tweet_oauth_access_token="$oauth_access_token"
  fi
  if [[ -n ${oauth_access_token_secret-} ]]; then
    Tweet_oauth_access_token_secret="$oauth_access_token_secret"
  fi

  Tweet_authorize && Tweet_tweet "$@"
  ## FIXME: Parse reply from Twitter.com
  return $?
}

## ======================================================================

if [[ ${0##*/} == tate ]] && [[ ${zsh_eval_context-toplevel} == toplevel ]]; then
  TATE_init

  if [[ ${GATEWAY_INTERFACE-} == @(CGI*) ]]; then
    TATE_echo_cgi "$@"
  else
    TATE_echo_command "$@"
  fi
  exit $?
fi

return 0