#1587 - Add deprecation warnings for old linter options

ale_linters/html/tidy.vim

@@ -3,11 +3,19 @@
 
 " CLI options
 let g:ale_html_tidy_executable = get(g:, 'ale_html_tidy_executable', 'tidy')
+" remove in 2.0
 " Look for the old _args variable first.
+let s:deprecation_warning_echoed = 0
 let s:default_options = get(g:, 'ale_html_tidy_args', '-q -e -language en')
 let g:ale_html_tidy_options = get(g:, 'ale_html_tidy_options', s:default_options)
 
 function! ale_linters#html#tidy#GetCommand(buffer) abort
+    " remove in 2.0
+    if exists('g:ale_html_tidy_args') && !s:deprecation_warning_echoed
+        execute 'echom ''Rename your g:ale_html_tidy_args setting to g:ale_html_tidy_options instead. Support for this will removed in ALE 2.0.'''
+        let s:deprecation_warning_echoed = 1
+    endif
+
     " Specify file encoding in options
     " (Idea taken from https://github.com/scrooloose/syntastic/blob/master/syntax_checkers/html/tidy.vim)
     let l:file_encoding = get({

ale_linters/python/flake8.vim

@@ -1,7 +1,9 @@
 " Author: w0rp <[email protected]>
 " Description: flake8 for python files
 
+" remove in 2.0
 " Support an old setting as a fallback.
+let s:deprecation_warning_echoed = 0
 let s:default_options = get(g:, 'ale_python_flake8_args', '')
 
 call ale#Set('python_flake8_executable', 'flake8')
@@ -38,6 +40,12 @@ function! ale_linters#python#flake8#VersionCheck(buffer) abort
 endfunction
 
 function! ale_linters#python#flake8#GetCommand(buffer, version_output) abort
+    " remove in 2.0
+    if exists('g:ale_python_flake8_args') && !s:deprecation_warning_echoed
+        execute 'echom ''Rename your g:ale_python_flake8_args setting to g:ale_python_flake8_options instead. Support for this will removed in ALE 2.0.'''
+        let s:deprecation_warning_echoed = 1
+    endif
+
     let l:cd_string = ale#Var(a:buffer, 'python_flake8_change_directory')
     \   ? ale#path#BufferCdString(a:buffer)
     \   : ''