" make vim unusable for anyone else
" from the get-go, we assume version >= 703

set nocompatible                      " screw vi

" hacks {{{1
if has('multi_byte')
    scriptencoding utf-8              " allow it in this script
    set termencoding=utf-8            " and this terminal supports it
    set encoding=utf-8                " and the default file is in it
endif

let g:rcvim=$HOME.'/.vim'
let &backupdir=g:rcvim.'/backup'      " stash tilde files elsewhere
" using a double slash here enables file path inclusion for uniqueness:
let &directory=g:rcvim.'/swp//'       " stash swap files too
let &undodir=g:rcvim.'/undo/'         " undo files are cool
try | call mkdir(&backupdir, "p") | catch /E739/ | endtry
try | call mkdir(&directory, "p") | catch /E739/ | endtry
try | call mkdir(&undodir,   "p") | catch /E739/ | endtry

" force colors on anything that looks reasonable
if (&term =~ "^xterm") || (&term == "screen")
    let &t_Co=256
    "let &t_AF="\e[38;5;%dm"
    "let &t_AB="\e[48;5;%dm"
endif

if &term =~ '^tmux'
    " https://unix.stackexchange.com/a/34723
    " tmux will send xterm-style keys when xterm-keys is on
    exec "set <xUp>=\e[1;*A"
    exec "set <xDown>=\e[1;*B"
    exec "set <xRight>=\e[1;*C"
    exec "set <xLeft>=\e[1;*D"
endif

" main config {{{1

if has('syntax')
    syntax enable                     " required for folding as well
    set hlsearch                      " highlight search results
    let c_syntax_for_h=1              " use C highlighting for .h files
endif

if has('gui_running')
    set guioptions-=M                 " skip loading $VIMRUNTIME/menu.vim
    set guioptions-=m                 " hide menu which isn't loaded anyway
    set guioptions-=T                 " hide toolbar
    set guioptions-=r                 " hide scrollbar
    if has("gui_gtk2")
        set guifont=Consolas\ 11
    else
        set guifont=Consolas:h9
    end
    set columns=84
    set lines=36
    cd $HOME                          " might not be ideal...
endif

if has('title') | set title | endif   " terminal title
set history=10000                     " command lines to remember
set number                            " lines
set ruler                             " write out the cursor position
set showcmd                           " show number of lines/etc. selected
set lazyredraw                        " when executing macros, untyped things
set shortmess=atI                     " be less verbose and shut up vim
set suffixes=.bak,~,.swp,.o,.log,.out " lower tab-completion priority
set noerrorbells visualbell t_vb=     " disable bells
set scrolloff=3                       " rows of context when scrolling
set sidescrolloff=2                   " cols of context when scrolling
set incsearch                         " show first search result as we type
set ignorecase                        " insensitive searching
set smartcase                         " except when uppercase is used
set infercase                         " use existing case when ins-completing
set smarttab                          " handle insertion and deletion of indents
set noautoindent                      " some distros have this set by default
set virtualedit=block                 " allow cursor anywhere in visual block
set foldmethod=marker                 " (performance issues with other methods)
set foldlevelstart=99                 " start with everything unfolded...?
set nowrap                            " word wrapping is pretty weak in vim
set nojoinspaces                      " don't use double-spaces for J and gq
set ffs=unix,dos                      " prefer unix-style EOLs (ffs indeed)
set nobomb                            " don't mention these on planes
set undofile                          " remember undos across files/sessions
set diffopt+=iwhite                   " ignore whitespace in diff command
set ttimeout ttimeoutlen=60           " make changing modes a bit snappier
set hidden                            " allow swapping out of unsaved buffers
set complete=.,w,b,u,t                " don't scan every file with autocomplete
set nrformats=bin,hex,unsigned        " ctrl+a/x non-negative numbers, no octal
set modeline modelines=5              " a file can specify its own vim settings
if has('mksession')
    set sessionoptions=blank,buffers,curdir,folds,tabpages,winsize,resize,winpos
end

if has('wildignore')
    " ignore files that typically aren't interesting to text editors like vim
    " FWIW, these lines don't need trailing commas
    set wildignore=""
    set wildignore+=.git,.hg,.svn,pkg,tmp
    set wildignore+=*.bak,*.cache,*.log,*.tmp
    set wildignore+=*.lnk,.DS_Store,Desktop.ini,Thumbs.db
    set wildignore+=*.7z,*.tar,*.tar.*,*.tgz,*.zip
    set wildignore+=*.pch,*.pdb,*.pgc,*.pgd,*.sln,*.suo
    set wildignore+=*.a,*.dll,*.elf,*.exe,*.lib,*.o,*.obj,*.out,*.so,*.so.*
    set wildignore+=*.m4a,*.mkv,*.mp3,*.mp4,*.ogg,*.opus,*.wav
    set wildignore+=*.bmp,*.gif,*.jfif,*.jpeg,*.jpg,*.pdf,*.png,*.webp
    set wildignore+=*.h5,*.npy,*.npz,*.pkl,*.pyc,*.pyd,*.pyo,__pycache__
    set wildignore+=*.gem,.bundle
    set wildignore+=CMakeCache.txt,CMakeFiles,install_manifest.txt
endif

let $PATH .= ':'.$HOME.'/sh'          " allow direct invocation of shell funcs

" fun {{{1

fu! Colour(name)                      " go nuts. go wild.
    hi clear | syntax clear | syntax on " reset everything for sure (#4405)
    if has('termguicolors')
        if &term =~ "^tmux-256color"
            let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
            let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
            set termguicolors
        endif
    endif
    exe "colo " . a:name
endf

command! -nargs=* Colour call Colour(<f-args>)

" lifted from BurntSushi:
fu! GlobalReplace()
    normal! gv"ry
    let replacement = input("Replace " . @r . " with: ")
    if replacement != ""
        exe "%s/" . @r . "/" . replacement . "/g"
    endif
endf

" lifted from BurntSushi:
fu! StripTrailingWhitespace()
    let l = line(".")
    let c = col(".")
    %s/\s\+$//e
    call cursor(l, c)
endf

fu! TabEight()
    setlocal tabstop=8 shiftwidth=8 noexpandtab softtabstop=0
endf

fu! TabFour()
    setlocal tabstop=8 shiftwidth=4 expandtab softtabstop=4
endf

fu! TabTwo()
    setlocal tabstop=2 shiftwidth=2 expandtab softtabstop=2
endf

fu! TabBad()
    setlocal tabstop=4 shiftwidth=4 noexpandtab softtabstop=4
endf

" set TabFour as default
set tabstop=8 shiftwidth=4 expandtab softtabstop=4

fu! DetectShebang()
    " vim has some rudimentary detection, but sometimes i want to override it.
    " vim's version is typically found here: /usr/share/vim/vim82/scripts.vim
    let l = getline(1)
    if l[:1] !=# '#!' | return | endif
    let l = trim(l[2:], ' ', 1) " sometimes there are spaces after the #!
    let p = matchstr(l, '^\%(/usr\)\=/s\=bin/\%(env\%( \+-S\)\= \+\)\=\zs[^ ]*\ze')

    if p ==# 'bash'    | setlocal ft=bash   | endif
    if p ==# 'dash'    | setlocal ft=bash   | endif
    if p ==# 'false'   | setlocal ft=bash   | endif
    if p ==# 'kuroko'  | setlocal ft=python | endif
    if p ==# 'lua'     | setlocal ft=lua    | endif
    if p ==# 'perl'    | setlocal ft=perl   | endif
    if p ==# 'perl6'   | setlocal ft=raku   | endif
    if p ==# 'python'  | setlocal ft=python | endif
    if p ==# 'python3' | setlocal ft=python | endif
    if p ==# 'raku'    | setlocal ft=raku   | endif
    if p ==# 'sh'      | setlocal ft=bash   | endif
    if p ==# 'zsh'     | setlocal ft=zsh    | endif
endf

" autocmd {{{1

if has('autocmd')
    augroup tabs
        au!
        au BufRead,BufNewFile *.bt,*.1sc    call TabFour()
        au BufRead,BufNewFile *.ys          call TabTwo()
        au BufRead,BufNewFile .gitconfig    call TabEight()
        au BufRead,BufNewFile PKGBUILD      call TabTwo()
        au FileType html,css                call TabTwo()
        au FileType javascript,processing   call TabTwo()
        au FileType nim                     call TabTwo()
        au FileType ruby                    call TabTwo()
        au FileType seed7                   call TabTwo()
        exec 'au' 'BufRead,BufNewFile' $HOME..'/src/bass/*' 'call TabTwo()'

    augroup END

    augroup filetypes
        au!
        au BufRead,BufNewFile *.1sc     setlocal ft=c
        au BufRead,BufNewFile *.asm     setlocal ft=lips
        au BufRead,BufNewFile *.bt      setlocal ft=c
        au BufRead,BufNewFile *.fs      setlocal ft=c
        au BufRead,BufNewFile *.glsl    setlocal ft=c
        au BufRead,BufNewFile *.hlsl    setlocal ft=c
        au BufRead,BufNewFile *.krk     setlocal ft=python
        au BufRead,BufNewFile *.lib     setlocal ft=spice
        au BufRead,BufNewFile *.nim     setlocal ft=nim
        au BufRead,BufNewFile *.pde     setlocal ft=processing
        au BufRead,BufNewFile,StdinReadPost * call DetectShebang()
    augroup END

    augroup insanity
        au!
        au FileType netrw setlocal bufhidden=wipe
    augroup END

    augroup nocomment
        au!
        " set or unset some convenient or annoying formatoptions
        au FileType * setlocal fo-=c fo-=r fo-=o fo-=j
    augroup END

    augroup forth
        au!
        " insert a newline every 64 bytes when reading
        au! BufReadCmd blkfs,*.scr call setline('1', split(join(readfile(expand('<afile>')), ''), '\%65c\zs'))
        " remove newlines when writing
        au! BufWriteCmd blkfs,*.scr call writefile([join(getline('^', '$'), '')], expand('<afile>'))
    augroup end

    augroup nobells                   " good lord vim you are archaic
        au!
        au GUIEnter * set vb t_vb=
    augroup END

    fu! ResCur()                      " attempt to preserve cursor position
        if line("'\"") > 1 && line("'\"") <= line("$")
            normal! g`"
            return 1
        endif
    endf
    augroup resCur
        au!
    "   au BufWinEnter * call ResCur()
    augroup END

    function! CheckFileEncoding()
        if exists('b:fenc_at_read') && &fileencoding != b:fenc_at_read
            exec 'e! ++enc=' . &fileencoding
            unlet b:fenc_at_read
        endif
    endfunction
    augroup fenc
        au! BufRead     *.txt let b:fenc_at_read=&fileencoding
        au! BufWinEnter *.txt call CheckFileEncoding()
    augroup END
endif

" keys/binds {{{1

set backspace=eol,start,indent        " make backspace useful

" tab completion in command-line
if has('wildmenu') | set wildmenu | endif

" mintty pls
"exec "set <s-Tab>=\e[Z"
"map <Esc>[Z <s-tab>
"ounmap <Esc>[Z

" easy indent/unindent
nn <tab> >>
nn <s-tab> <<
" indentation without ending selection
vn <silent> <tab> >gv
vn <silent> <s-tab> <gv

fu! Inn(q)
    " bind both normal and insert modes
    let args=split(a:q, '^\s*\(<[^>]\+>\s\+\)\+\zs')
    exec 'nn  '.args[0].'      '.args[1]
    exec 'ino '.args[0].' <c-o>'.args[1]
endf
com! -nargs=+ Inn call Inn(<q-args>)

Inn <F5>    :w<cr>
Inn <F6>    :Next<cr>
Inn <F7>    :next<cr>
Inn <F8>    :e %<cr>
Inn <F9>    @@
Inn <F10>   :bd<cr>
Inn <c-F5>  :w!<cr>
Inn <c-F8>  :e! %<cr>
Inn <c-F10> :bd!<cr>
Inn <s-F5>  :wall<cr>

" np++ habits
Inn <c-up> <c-y>
Inn <c-down> <c-e>
Inn <silent> <c-s-up> :m-2<cr>
Inn <silent> <c-s-down> :m+1<cr>
Inn <silent> <c-s-PageUp> :tabm -1<cr>
Inn <silent> <c-s-PageDown> :tabm +1<cr>

" jump to top and bottom
Inn <c-Home> gg
Inn <c-End>  G
nn <Esc>[1;5H gg
nn <Esc>[1;5F G
ino <Esc>[1;5H <c-o>gg
ino <Esc>[1;5F <c-o>G

" hide search highlighting
Inn <silent> <c-]> :nohls<enter>

" rebind annoying things:
" reflow text
nn Q gq
vn Q gq
" split lines (opposite of J)
nn K i<cr><esc>k$
vn K <nop>
" follow tag
nn <bar> <c-]>
" delete line
"nn D dd

" execute vim commands in visual selection
vmap <space> "xy:@x<cr>

" open a shell (only works if you `exec vim` instead of running it in a shell)
nn <C-z> :sh<cr>

" this frees up x and X for rebinding if you like
exec "set <s-Del>=\<Esc>[3;2~"
Inn <s-Del> X

let leader="\\"
"ino <c-\> <C-o><Leader>              " this doesn't workkkkkkkkk
nn <Leader>2 :call TabTwo()<cr>
nn <Leader>3 :call TabBad()<cr>
nn <Leader>4 :call TabFour()<cr>
nn <Leader>5 :call TabEight()<cr>
nm <Leader>a a?<Esc>r
nm <Leader>i i?<Esc>r
nn <Leader>, :Tab /,\zs<cr>
nn <Leader>. @:
nn <Leader><Leader> :<cr>
nn <Leader><space> :call StripTrailingWhitespace()<cr>
"nn <Leader>? :exec getline(".")
nn <Leader>F :E .<cr>
nn <Leader>P "0P
nn <Leader>b :ls<cr>:b<space>
nn <Leader>e :e **/*
nn <Leader>f :E<cr>
nn <Leader>p "0p
"nn <Leader>x :system('chmod +x %') | e
nn <silent> <Leader>d :cd %:p:h<cr>:pwd<cr>

vn <silent> & :call GlobalReplace()<cr>

" TODO:
"nn ,, :call CommentLines()<cr>
"nn ,. :call UncommentLines()<cr>

" alias :W to :w, via https://stackoverflow.com/a/3879737
cnoreabbrev <expr> W ((getcmdtype() is# ':' && getcmdline() is# 'W')?('w'):('W'))

" https://stackoverflow.com/a/58244921
fu! SynStack()
    for i1 in synstack(line("."), col("."))
        let i2 = synIDtrans(i1)
        let n1 = synIDattr(i1, "name")
        let n2 = synIDattr(i2, "name")
        echo n1 "->" n2
    endfor
endfunction

map gm :call SynStack()<CR>

" misc {{{1

set list listchars=tab:»·,trail:·,extends:…,nbsp:‗
" including this in case i'm on a _really_ bad terminal:
"set list listchars=tab:>-,trail:.,extends:>,nbsp:_

" deprecated, but still perfectly functional, and especially backwards compatible:
try | exec pathogen#infect() | catch /E117/ | endtry

let g:netrw_banner=0                  " be quiet
let g:netrw_fastbrowse = 0            " so THAT'S what's been causing me agony

set background=dark
try | colorscheme minimalist | catch /E185/ | colorscheme desert | endtry

" barely any colorschemes set these to anything useful. negligence? indifference?
hi diffRemoved ctermfg=168 guifg=#d75f87
hi diffAdded   ctermfg=78  guifg=#5fd75f

" ctrlp {{{1

map <silent> <c-n> :CtrlPBuffer<cr>
let g:ctrlp_match_window='bottom,order:btt,min:1,max:24,results:24'

" machine-specific configs {{{1

let s:hostname=hostname()
if s:hostname == "phantom-pi" || s:hostname == "wraith"
    colorscheme minimalist
endif

" macros {{{1

" to dump a macro, enter insert mode and hit [Ctrl+R] [Ctrl+R] [macro letter].
" note that this will not properly escape any single quotes used in the macro.
let s:q="'"

" explode: split an expression's right-hand-side by commas
let @s= 'ma'
let @s.=':sil s/ *= */&\r/e
'
let @s.='-mb' " the next line may error, so set a mark now
let @s.=':sil s/,/\r/g
'
let @s.='-mb'
"let @s.=s:q..'a'
"let @s.='OEXPLODE=HERE;'
"let @s.=s:q..'b'
"let @s.='oEXPLODE=THERE;'
let @s.=s:q..'a
'

" implode: join the previously split expression, sort -ui
let @j= ':sil '..s:q..'a+1,'..s:q..'b'..'sor ui
'
let @j.=':sil '..s:q..'a+1,'..s:q..'b-1'..'norm!A,
'
let @j.=':sil '..s:q..'a,'..s:q..'b'..'j!
'
let @j.=s:q..'a'