Replace vim-airline by lightline. Add ALE linter. Configure YCM

vimrc

@@ -59,20 +59,40 @@ if has("unix") || has("mac")
         map <F5> :UndotreeToggle<CR>
         Plugin 'vim-scripts/LaTeX-Box'
         map <LocalLeader>ll :Latexmk<CR>
-        if isdirectory(expand("/home/lhark/.vim/bundle/YouCompleteMe"))
+        if isdirectory(expand("$HOME/.vim/bundle/YouCompleteMe")) || isdirectory(expand("/usr/share/vim/vimfiles/third_party/ycmd/"))
             "[Workaround for YCM non-portability]"
             Plugin 'Valloric/YouCompleteMe'
+            let g:ycm_global_ycm_extra_conf = '/usr/share/vim/vimfiles/third_party/ycmd/cpp/ycm/.ycm_extra_conf.py'
+            let g:ycm_server_python_interpreter = '/usr/bin/python2'
         else
             Plugin 'AutoComplPop'
         endif
-        Plugin 'vim-airline/vim-airline-themes'
+        Plugin 'w0rp/ale'
-        Plugin 'vim-airline/vim-airline'
+        let g:ale_sign_error = 'E'
+        let g:ale_sign_warning = 'W'
+        Plugin 'itchyny/lightline.vim'
+        let g:lightline = {
+                    \'colorscheme': 'solarized',
+                    \ 'active': {
+                    \   'left': [['mode', 'paste'], ['filename', 'modified']],
+                    \   'right': [['lineinfo'], ['percent'], ['readonly', 'linter_warnings', 'linter_errors', 'linter_ok']]
+                    \ },
+                    \ 'component_expand': {
+                    \   'linter_warnings': 'LightlineLinterWarnings',
+                    \   'linter_errors': 'LightlineLinterErrors',
+                    \   'linter_ok': 'LightlineLinterOK'
+                    \ },
+                    \ 'component_type': {
+                    \   'readonly': 'error',
+                    \   'linter_warnings': 'warning',
+                    \   'linter_errors': 'error'
+                    \ },
+                    \}
         Plugin 'godlygeek/tabular'
         Plugin 'tikhomirov/vim-glsl'
         Plugin 'mzlogin/vim-smali'
         Plugin 'jamessan/vim-gnupg'
         Plugin 'petRUShka/vim-opencl'
-        Plugin 'Raimondi/delimitMate'
         Plugin 'tpope/vim-surround'
         Plugin 'captbaritone/better-indent-support-for-php-with-html'
         "[Autodetect indent style of a file]"
@@ -167,16 +187,8 @@ if has("unix") || has("mac")
 endif
 "[Always show StatusLine]"
 set laststatus=2
-"[Define StatusLine]"
+"[Do not show mode in command line]"
-set statusline=""
+set noshowmode
-set statusline+=%F%m%r%h%w
-set wrapscan
-set statusline+=%=%y
-set statusline+=\ [%{&ff}]
-set statusline+=\ Line:%l/%L
-set statusline+=\ Column:[%v]
-set statusline+=\ Buffer:[%n]
-"set statusline+=\ Mode:[%{ShowModeInStatusLine()}]
 "[Splitting rules]"
 set splitbelow
 set splitright
@@ -199,11 +211,10 @@ set mousehide
 "[Visualisation settings]"
 set background=dark
 set ttyfast
-set showmode
 set tabline=""
 " set cmdheight=1 : default
 set showtabline=0
-set colorcolumn=""
+set colorcolumn=80
 set nocursorcolumn
 set cmdwinheight=10
 set virtualedit=all
@@ -227,7 +238,7 @@ if has("gui_running")
     elseif has("unix")
         try
             colorscheme solarized
-            set guifont=Liberation\ Mono\ 12
+            set guifont=Liberation\ Mono\ 10
         catch
         endtry
     elseif has("mac")
@@ -265,6 +276,7 @@ set history=1000
 set nowritebackup
 set undolevels=5000
 "[Indent & Tab/mode-line settings]"
+set breakindent
 set nopaste
 set modeline
 set smarttab
@@ -410,7 +422,7 @@ endif
 "[Python/Perl scripts templates]"
 function! InitScriptFile(type)
     if (a:type == "python")
-        execute setline(1, "#!/usr/bin/env python")
+        execute setline(1, "#!/usr/bin/env python3")
         execute setline(2, "# -*- coding: utf-8 -*-")
     elseif (a:type == "perl")
         execute setline(1, "#!/usr/bin/env perl")
@@ -438,21 +450,6 @@ if has("autocmd")
     autocmd BufWritePre *.py,*.pyw retab
     autocmd BufWritePre * call DeleteTrailingTWS()
 endif
-"[Show current mode in StatusLine]"
-function! ShowModeInStatusLine()
-    let g:currentMode = mode()
-    let g:showMode = ""
-    if (g:currentMode ==# "i")
-        let g:showMode = "Insert"
-    elseif (g:currentMode ==# "R")
-        let g:showMode = "Replace"
-    elseif (g:currentMode ==# "n")
-        let g:showMode = "Normal"
-    else
-        let g:showMode = "Visual"
-    endif
-    return g:showMode
-endfunction
 "[Toggle relativenumber between normal & insert mode]"
 "[Credit: https://jeffkreeftmeijer.com/vim-number/#relative-line-numbers ]"
 if has("autocmd")
@@ -462,3 +459,33 @@ if has("autocmd")
         autocmd BufLeave,FocusLost,InsertEnter * set norelativenumber
     augroup END
 endif
+"[ALELint & Lightline compat]"
+function! LightlineLinterWarnings() abort
+  let l:counts = ale#statusline#Count(bufnr(''))
+  let l:all_errors = l:counts.error + l:counts.style_error
+  let l:all_non_errors = l:counts.total - l:all_errors
+  return l:counts.total == 0 ? '' : printf('%d ◆', all_non_errors)
+endfunction
+
+function! LightlineLinterErrors() abort
+  let l:counts = ale#statusline#Count(bufnr(''))
+  let l:all_errors = l:counts.error + l:counts.style_error
+  let l:all_non_errors = l:counts.total - l:all_errors
+  return l:counts.total == 0 ? '' : printf('%d ✗', all_errors)
+endfunction
+
+function! LightlineLinterOK() abort
+  let l:counts = ale#statusline#Count(bufnr(''))
+  let l:all_errors = l:counts.error + l:counts.style_error
+  let l:all_non_errors = l:counts.total - l:all_errors
+  return l:counts.total == 0 ? '✓ ' : ''
+endfunction
+
+autocmd User ALELint call s:MaybeUpdateLightline()
+
+" Update and show lightline but only if it's visible (e.g., not in Goyo)
+function! s:MaybeUpdateLightline()
+  if exists('#lightline')
+    call lightline#update()
+  end
+endfunction