EasyDigraph tries to make inputting special characters easier.

Normally, With |:digraphs|, i_ can be used to input a special character. but to press it everycharacter is bothering. With EasyDigraph, you can use mapping with |motion| to convert range of special characters.

Default mapping of Normal Mode is 'bb'. (You can remap it by changing |g:EasyDigraph_nmap|) Then you can input {motion} to change a specific area.

For example:

aW on 'a*b*c*d*e*' to Greek letter 'αβξδε'
2w on 'o5hayou5 gozai5masu' to Hiragana 'おはよう ございます'
i{ in '{(S8S+S3SnS)S}' to SuperScript {⁽⁸⁺³ⁿ⁾}' 
it in '<p>\n3S >* \n2S </p>' to '<p>n³≫ n² </p>'

EasyDigraph will automatically igonre converted characters. That is, only convert the characters between ASCII 33~126 so press shortcut on 'αβξδε' will make no change on it.

And when Converting, Vim digraph will ignore '' with char after. so '\1+\2' will became '1+2'. The only exception is '/'. (Until vim 7.3 )

A Insert Mode mapping and Visual Mode mapping are avaliable. Change at |g:EasyDigraph_vmap|, |g:EasyDigraph_imap|.

with |g:EasyDigraph_subs| and |g:EasyDigraph_cpunc| set to 1. some more addition digraphs are defined. (default is 1)

" subscripts and superscripts g:EasyDigraph_subs
`0 ⁰  `+ ⁺ ... ( 0-9 + - ( ) / ^ . , > < )
`a ᵃ  `A ᴬ ... ( a-z except q , Some of A-Z)
_0 ₀  _+ ₊ ... ( 0-9 + - ( ) / ^ )
_a ₐ  _e ₑ ... (a e h i k l m n o p r s t u v x)

and XO is defined to ⊕ (XOR)

" some chinese punctuations. g:EasyDigraph_cpunc
" ,, ， ,.  。 ,! ！ ,? ？ ,( （ ,) ） ,$ ￥ ,^ …  ,_ — ,\  、 ,; ；
" NOTE: some are already defined.
" bracket   :  <+ 《 <' 「 <" 『 (" 【 (I 〖
" quotation : '6 ‘ '9 ’ "6 “ "9 ”

Chinese PinYin: v- ǖ   v' ǘ    v< ǚ    v` ǜ

looking at |:digraph| and |digraphs-default| for digraph details.

You can post issues at https://github.com/Rykka/easydigraph.vim/

There is an article that classified the vim digraphs roughly at http://rykka.is-programmer.com/posts/31752 (Chinese)