皆さん「何言ってんだこいつ…」

はい、こういうことです。

アーイキソ… → ｱｰｲｷｿ…

これをGoogle日本語入力で変換する方法を僕は知りません。できるなら教えてください。オナシャス！

では、こちらです。

s="ぬわぁぁぁん疲れたもぉぉぉぉん"

argv = ARGV[0]
# s = argv
s = argv.gsub(//,'')

s.gsub!(/あ/,"ｱ")
s.gsub!(/い/,"ｲ")
s.gsub!(/う/,"ｳ")
s.gsub!(/え/,"ｴ")
s.gsub!(/お/,"ｵ")
s.gsub!(/か/,"ｶ")
s.gsub!(/き/,"ｷ")
s.gsub!(/く/,"ｸ")
s.gsub!(/け/,"ｹ")
s.gsub!(/こ/,"ｺ")
s.gsub!(/さ/,"ｻ")
s.gsub!(/し/,"ｼ")
s.gsub!(/す/,"ｽ")
s.gsub!(/せ/,"ｾ")
s.gsub!(/そ/,"ｿ")
s.gsub!(/た/,"ﾀ")
s.gsub!(/ち/,"ﾁ")
s.gsub!(/つ/,"ﾂ")
s.gsub!(/て/,"ﾃ")
s.gsub!(/と/,"ﾄ")
s.gsub!(/な/,"ﾅ")
s.gsub!(/に/,"ﾆ")
s.gsub!(/ぬ/,"ﾇ")
s.gsub!(/ね/,"ﾈ")
s.gsub!(/の/,"ﾉ")
s.gsub!(/は/,"ﾊ")
s.gsub!(/ひ/,"ﾋ")
s.gsub!(/ふ/,"ﾌ")
s.gsub!(/へ/,"ﾍ")
s.gsub!(/ほ/,"ﾎ")
s.gsub!(/ま/,"ﾏ")
s.gsub!(/み/,"ﾐ")
s.gsub!(/む/,"ﾑ")
s.gsub!(/め/,"ﾒ")
s.gsub!(/も/,"ﾓ")
s.gsub!(/や/,"ﾔ")
s.gsub!(/ゆ/,"ﾕ")
s.gsub!(/よ/,"ﾖ")
s.gsub!(/ら/,"ﾗ")
s.gsub!(/り/,"ﾘ")
s.gsub!(/る/,"ﾙ")
s.gsub!(/れ/,"ﾚ")
s.gsub!(/ろ/,"ﾛ")
s.gsub!(/わ/,"ﾜ")
s.gsub!(/を/,"ｦ")
s.gsub!(/ん/,"ﾝ")
s.gsub!(/ゔ/,"ｳﾞ")
s.gsub!(/が/,"ｶﾞ")
s.gsub!(/ぎ/,"ｷﾞ")
s.gsub!(/ぐ/,"ｸﾞ")
s.gsub!(/げ/,"ｹﾞ")
s.gsub!(/ご/,"ｺﾞ")
s.gsub!(/ざ/,"ｻﾞ")
s.gsub!(/じ/,"ｼﾞ")
s.gsub!(/ず/,"ｽﾞ")
s.gsub!(/ぜ/,"ｾﾞ")
s.gsub!(/ぞ/,"ｿﾞ")
s.gsub!(/だ/,"ﾀﾞ")
s.gsub!(/ぢ/,"ﾁﾞ")
s.gsub!(/づ/,"ﾂﾞ")
s.gsub!(/で/,"ﾃﾞ")
s.gsub!(/ど/,"ﾄﾞ")
s.gsub!(/ば/,"ﾊﾞ")
s.gsub!(/び/,"ﾋﾞ")
s.gsub!(/ぶ/,"ﾌﾞ")
s.gsub!(/べ/,"ﾍﾞ")
s.gsub!(/ぼ/,"ﾎﾞ")
s.gsub!(/ぱ/,"ﾊﾟ")
s.gsub!(/ぴ/,"ﾋﾟ")
s.gsub!(/ぷ/,"ﾌﾟ")
s.gsub!(/ぺ/,"ﾍﾟ")
s.gsub!(/ぽ/,"ﾎﾟ")
s.gsub!(/ぁ/,"ｧ")
s.gsub!(/ぃ/,"ｨ")
s.gsub!(/ぅ/,"ｩ")
s.gsub!(/ぇ/,"ｪ")
s.gsub!(/ぉ/,"ｫ")
s.gsub!(/ゃ/,"ｬ")
s.gsub!(/ゅ/,"ｭ")
s.gsub!(/ょ/,"ｮ")
s.gsub!(/っ/,"ｯ")
s.gsub!(/ア/,"ｱ")
s.gsub!(/イ/,"ｲ")
s.gsub!(/ウ/,"ｳ")
s.gsub!(/エ/,"ｴ")
s.gsub!(/オ/,"ｵ")
s.gsub!(/カ/,"ｶ")
s.gsub!(/キ/,"ｷ")
s.gsub!(/ク/,"ｸ")
s.gsub!(/ケ/,"ｹ")
s.gsub!(/コ/,"ｺ")
s.gsub!(/サ/,"ｻ")
s.gsub!(/シ/,"ｼ")
s.gsub!(/ス/,"ｽ")
s.gsub!(/セ/,"ｾ")
s.gsub!(/ソ/,"ｿ")
s.gsub!(/タ/,"ﾀ")
s.gsub!(/チ/,"ﾁ")
s.gsub!(/ツ/,"ﾂ")
s.gsub!(/テ/,"ﾃ")
s.gsub!(/ト/,"ﾄ")
s.gsub!(/ナ/,"ﾅ")
s.gsub!(/ニ/,"ﾆ")
s.gsub!(/ヌ/,"ﾇ")
s.gsub!(/ネ/,"ﾈ")
s.gsub!(/ノ/,"ﾉ")
s.gsub!(/ハ/,"ﾊ")
s.gsub!(/ヒ/,"ﾋ")
s.gsub!(/フ/,"ﾌ")
s.gsub!(/ヘ/,"ﾍ")
s.gsub!(/ホ/,"ﾎ")
s.gsub!(/マ/,"ﾏ")
s.gsub!(/ミ/,"ﾐ")
s.gsub!(/ム/,"ﾑ")
s.gsub!(/メ/,"ﾒ")
s.gsub!(/モ/,"ﾓ")
s.gsub!(/ヤ/,"ﾔ")
s.gsub!(/ユ/,"ﾕ")
s.gsub!(/ヨ/,"ﾖ")
s.gsub!(/ラ/,"ﾗ")
s.gsub!(/リ/,"ﾘ")
s.gsub!(/ル/,"ﾙ")
s.gsub!(/レ/,"ﾚ")
s.gsub!(/ロ/,"ﾛ")
s.gsub!(/ワ/,"ﾜ")
s.gsub!(/ヲ/,"ｦ")
s.gsub!(/ン/,"ﾝ")
s.gsub!(/ヴ/,"ｳﾞ")
s.gsub!(/ガ/,"ｶﾞ")
s.gsub!(/ギ/,"ｷﾞ")
s.gsub!(/グ/,"ｸﾞ")
s.gsub!(/ゲ/,"ｹﾞ")
s.gsub!(/ゴ/,"ｺﾞ")
s.gsub!(/ザ/,"ｻﾞ")
s.gsub!(/ジ/,"ｼﾞ")
s.gsub!(/ズ/,"ｽﾞ")
s.gsub!(/ゼ/,"ｾﾞ")
s.gsub!(/ゾ/,"ｿﾞ")
s.gsub!(/ダ/,"ﾀﾞ")
s.gsub!(/ヂ/,"ﾁﾞ")
s.gsub!(/ヅ/,"ﾂﾞ")
s.gsub!(/デ/,"ﾃﾞ")
s.gsub!(/ド/,"ﾄﾞ")
s.gsub!(/バ/,"ﾊﾞ")
s.gsub!(/ビ/,"ﾋﾞ")
s.gsub!(/ブ/,"ﾌﾞ")
s.gsub!(/ベ/,"ﾍﾞ")
s.gsub!(/ボ/,"ﾎﾞ")
s.gsub!(/パ/,"ﾊﾟ")
s.gsub!(/ピ/,"ﾋﾟ")
s.gsub!(/プ/,"ﾌﾟ")
s.gsub!(/ペ/,"ﾍﾟ")
s.gsub!(/ポ/,"ﾎﾟ")
s.gsub!(/ァ/,"ｧ")
s.gsub!(/ィ/,"ｨ")
s.gsub!(/ゥ/,"ｩ")
s.gsub!(/ェ/,"ｪ")
s.gsub!(/ォ/,"ｫ")
s.gsub!(/ャ/,"ｬ")
s.gsub!(/ュ/,"ｭ")
s.gsub!(/ョ/,"ｮ")
s.gsub!(/ッ/,"ｯ")

#
# カナ(半角）    ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜｦﾝｳﾞｶﾞｷﾞｸﾞｹﾞｺﾞｻﾞｼﾞｽﾞｾﾞｿﾞﾀﾞﾁﾞﾂﾞﾃﾞﾄﾞﾊﾞﾋﾞﾌﾞﾍﾞﾎﾞﾊﾟﾋﾟﾌﾟﾍﾟﾎﾟｧｨｩｪｫｬｭｮｯ
# カナ(全角）    アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワヲンヴガギグゲゴザジズゼゾダヂヅデドバビブベボパピプペポァィゥェォャュョッ
# ひらがな
#
# ひらがな  あいうえおかきくけこさしすせそたちつてとなにぬねのはひふへほまみむめもやゆよらりるれろわをんゔがぎぐげござじずぜぞだぢづでどばびぶべぼぱぴぷぺぽぁぃぅぇぉゃゅょっ
#
# s.gsub!(/a/,
#   "ｱｰｲｷｿ")

puts s

実行結果はこんな感じ。

yuis@DESKTOP-UHU8FSH:/mnt/c/pg/zenkaku_henkan$ ruby /mnt/c/pg/zenkaku_henkan/かな文字半角変換.rb カンノミホ…
ｶﾝﾉﾐﾎ…
yuis@DESKTOP-UHU8FSH:/mnt/c/pg/zenkaku_henkan$ ruby /mnt/c/pg/zenkaku_henkan/かな文字半角変換.rb  かんのみほ…
ｶﾝﾉﾐﾎ…
yuis@DESKTOP-UHU8FSH:/mnt/c/pg/zenkaku_henkan$ ruby /mnt/c/pg/zenkaku_henkan/かな文字半角変換.rb ゔぉー…
ｳﾞｫー…

ﾁｶﾚﾀ…(作業時間3時間並感)