最近在做Linux的作业，要用到vim写代码，因此做了一些配置，在此记下。
开始使用vim的时候，对各种命令都不熟悉，因此写代码很痛苦。但是在熟练之后，真香。
在配置中，有一个轻量级的代码补全系统，来自大佬韦易笑的文章：Vim2021：超轻量级代码补全系统 - 知乎 (zhihu.com)
set nu "在左侧行号
set tabstop=4 "tab 长度设置为 4
set nobackup "覆盖文件时不备份
set cursorline "突出显示当前行
set ruler "在右下角显示光标位置的状态行
set autoindent "自动缩进
inoremap ' ''<ESC>i
inoremap " ""<ESC>i
inoremap ( ()<ESC>i
inoremap [ []<ESC>i
inoremap { {}<ESC>i
" vim: set noet fenc=utf-8 ff=unix sts=4 sw=4 ts=4 :
"
" apc.vim - auto popup completion window
"
" Created by skywind on 2020/03/05
" Last Modified: 2022/12/05 21:22
"
" Features:
"
" - auto popup complete window without select the first one
" - tab/s-tab to cycle suggestions, <c-e> to cancel
" - use ApcEnable/ApcDisable to toggle for certiain file.
"
" Usage:
"
set cpt=.,k,b
set completeopt=menu,menuone,noselect
let g:apc_enable_ft = {'*':1}
let g:apc_enable_ft = get(g:, 'apc_enable_ft', {}) " enable filetypes
let g:apc_enable_tab = get(g:, 'apc_enable_tab', 1) " remap tab
let g:apc_min_length = get(g:, 'apc_min_length', 2) " minimal length to open popup
let g:apc_key_ignore = get(g:, 'apc_key_ignore', []) " ignore keywords
let g:apc_trigger = get(g:, 'apc_trigger', "\<c-n>") " which key to trigger popmenu
" get word before cursor
function! s:get_context()
return strpart(getline('.'), 0, col('.') - 1)
endfunc
function! s:meets_keyword(context)
if g:apc_min_length <= 0
return 0
endif
let matches = matchlist(a:context, '\(\k\{' . g:apc_min_length . ',}\)$')
if empty(matches)
return 0
endif
for ignore in g:apc_key_ignore
if stridx(ignore, matches[1]) == 0
return 0
endif
endfor
return 1
endfunc
function! s:check_back_space() abort
return col('.') < 2 || getline('.')[col('.') - 2] =~# '\s'
endfunc
function! s:on_backspace()
if pumvisible() == 0
return "\<BS>"
endif
let text = matchstr(s:get_context(), '.*\ze.')
return s:meets_keyword(text)? "\<BS>" : "\<c-e>\<bs>"
endfunc
" autocmd for CursorMovedI
function! s:feed_popup()
let enable = get(b:, 'apc_enable', 0)
let lastx = get(b:, 'apc_lastx', -1)
let lasty = get(b:, 'apc_lasty', -1)
let tick = get(b:, 'apc_tick', -1)
if &bt != '' || enable == 0 || &paste
return -1
endif
let x = col('.') - 1
let y = line('.') - 1
if pumvisible()
let context = s:get_context()
if s:meets_keyword(context) == 0
call feedkeys("\<c-e>", 'n')
endif
let b:apc_lastx = x
let b:apc_lasty = y
let b:apc_tick = b:changedtick
return 0
elseif lastx == x && lasty == y
return -2
elseif b:changedtick == tick
let lastx = x
let lasty = y
return -3
endif
let context = s:get_context()
if s:meets_keyword(context)
silent! call feedkeys(get(b:, 'apc_trigger', g:apc_trigger), 'n')
let b:apc_lastx = x
let b:apc_lasty = y
let b:apc_tick = b:changedtick
endif
return 0
endfunc
" autocmd for CompleteDone
function! s:complete_done()
let b:apc_lastx = col('.') - 1
let b:apc_lasty = line('.') - 1
let b:apc_tick = b:changedtick
endfunc
" enable apc
function! s:apc_enable()
call s:apc_disable()
augroup ApcEventGroup
au!
au CursorMovedI <buffer> nested call s:feed_popup()
au CompleteDone <buffer> call s:complete_done()
augroup END
let b:apc_init_autocmd = 1
if g:apc_enable_tab
inoremap <silent><buffer><expr> <tab>
\ pumvisible()? "\<c-n>" :
\ <SID>check_back_space() ? "\<tab>" :
\ get(b:, 'apc_trigger', g:apc_trigger)
inoremap <silent><buffer><expr> <s-tab>
\ pumvisible()? "\<c-p>" : "\<s-tab>"
let b:apc_init_tab = 1
endif
if get(g:, 'apc_cr_confirm', 0) == 0
inoremap <silent><buffer><expr> <cr>
\ pumvisible()? "\<c-y>\<cr>" : "\<cr>"
else
inoremap <silent><buffer><expr> <cr>
\ pumvisible()? "\<c-y>" : "\<cr>"
endif
inoremap <silent><buffer><expr> <bs> <SID>on_backspace()
let b:apc_init_bs = 1
let b:apc_init_cr = 1
let b:apc_save_infer = &infercase
setlocal infercase
let b:apc_enable = 1
endfunc
" disable apc
function! s:apc_disable()
if get(b:, 'apc_init_autocmd', 0)
augroup ApcEventGroup
au!
augroup END
endif
if get(b:, 'apc_init_tab', 0)
silent! iunmap <buffer><expr> <tab>
silent! iunmap <buffer><expr> <s-tab>
endif
if get(b:, 'apc_init_bs', 0)
silent! iunmap <buffer><expr> <bs>
endif
if get(b:, 'apc_init_cr', 0)
silent! iunmap <buffer><expr> <cr>
endif
if get(b:, 'apc_save_infer', '') != ''
let &l:infercase = b:apc_save_infer
endif
let b:apc_init_autocmd = 0
let b:apc_init_tab = 0
let b:apc_init_bs = 0
let b:apc_init_cr = 0
let b:apc_save_infer = ''
let b:apc_enable = 0
endfunc
" check if need to be enabled
function! s:apc_check_init()
if &bt != '' || get(b:, 'apc_enable', 1) == 0
return
endif
if get(g:apc_enable_ft, &ft, 0) != 0
ApcEnable
elseif get(g:apc_enable_ft, '*', 0) != 0
ApcEnable
elseif get(b:, 'apc_enable', 0)
ApcEnable
endif
endfunc
" commands & autocmd
command! -nargs=0 ApcEnable call s:apc_enable()
command! -nargs=0 ApcDisable call s:apc_disable()
augroup ApcInitGroup
au!
au FileType * call s:apc_check_init()
au BufEnter * call s:apc_check_init()
au TabEnter * call s:apc_check_init()
augroup END