Write heuristics for perl, closes #550

indent/bzl.vim

@@ -0,0 +1,98 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'bzl') == -1
+
+" Vim indent file
+" Language:	Bazel (http://bazel.io)
+" Maintainer:	David Barnett (https://github.com/google/vim-ft-bzl)
+" Last Change:	2017 Jun 13
+
+if exists('b:did_indent')
+  finish
+endif
+
+" Load base python indent.
+if !exists('*GetPythonIndent')
+  runtime! indent/python.vim
+endif
+
+let b:did_indent = 1
+
+" Only enable bzl google indent if python google indent is enabled.
+if !get(g:, 'no_google_python_indent')
+  setlocal indentexpr=GetBzlIndent(v:lnum)
+endif
+
+if exists('*GetBzlIndent')
+  finish
+endif
+
+let s:save_cpo = &cpo
+set cpo-=C
+
+" Maximum number of lines to look backwards.
+let s:maxoff = 50
+
+""
+" Determine the correct indent level given an {lnum} in the current buffer.
+function GetBzlIndent(lnum) abort
+  let l:use_recursive_indent = !get(g:, 'no_google_python_recursive_indent')
+  if l:use_recursive_indent
+    " Backup and override indent setting variables.
+    if exists('g:pyindent_nested_paren')
+      let l:pyindent_nested_paren = g:pyindent_nested_paren
+    endif
+    if exists('g:pyindent_open_paren')
+      let l:pyindent_open_paren = g:pyindent_open_paren
+    endif
+    let g:pyindent_nested_paren = 'shiftwidth() * 2'
+    let g:pyindent_open_paren = 'shiftwidth() * 2'
+  endif
+
+  let l:indent = -1
+
+  " Indent inside parens.
+  " Align with the open paren unless it is at the end of the line.
+  " E.g.
+  "   open_paren_not_at_EOL(100,
+  "                         (200,
+  "                          300),
+  "                         400)
+  "   open_paren_at_EOL(
+  "       100, 200, 300, 400)
+  call cursor(a:lnum, 1)
+  let [l:par_line, l:par_col] = searchpairpos('(\|{\|\[', '', ')\|}\|\]', 'bW',
+      \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :" .
+      \ " synIDattr(synID(line('.'), col('.'), 1), 'name')" .
+      \ " =~ '\\(Comment\\|String\\)$'")
+  if l:par_line > 0
+    call cursor(l:par_line, 1)
+    if l:par_col != col('$') - 1
+      let l:indent = l:par_col
+    endif
+  endif
+
+  " Delegate the rest to the original function.
+  if l:indent == -1
+    let l:indent = GetPythonIndent(a:lnum)
+  endif
+
+  if l:use_recursive_indent
+    " Restore global variables.
+    if exists('l:pyindent_nested_paren')
+      let g:pyindent_nested_paren = l:pyindent_nested_paren
+    else
+      unlet g:pyindent_nested_paren
+    endif
+    if exists('l:pyindent_open_paren')
+      let g:pyindent_open_paren = l:pyindent_open_paren
+    else
+      unlet g:pyindent_open_paren
+    endif
+  endif
+
+  return l:indent
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+endif

indent/prolog.vim

@@ -0,0 +1,71 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'prolog') == -1
+
+"  vim: set sw=4 sts=4:
+"  Maintainer	: Gergely Kontra <kgergely@mcl.hu>
+"  Revised on	: 2002.02.18. 23:34:05
+"  Language	: Prolog
+"  Last change by: Takuya Fujiwara, 2018 Sep 23
+
+" TODO:
+"   checking with respect to syntax highlighting
+"   ignoring multiline comments
+"   detecting multiline strings
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+    finish
+endif
+
+let b:did_indent = 1
+
+setlocal indentexpr=GetPrologIndent()
+setlocal indentkeys-=:,0#
+setlocal indentkeys+=0%,-,0;,>,0)
+
+" Only define the function once.
+"if exists("*GetPrologIndent")
+"    finish
+"endif
+
+function! GetPrologIndent()
+    " Find a non-blank line above the current line.
+    let pnum = prevnonblank(v:lnum - 1)
+    " Hit the start of the file, use zero indent.
+    if pnum == 0
+       return 0
+    endif
+    let line = getline(v:lnum)
+    let pline = getline(pnum)
+
+    let ind = indent(pnum)
+    " Previous line was comment -> use previous line's indent
+    if pline =~ '^\s*%'
+	return ind
+    endif
+    " Previous line was the start of block comment -> +1 after '/*' comment
+    if pline =~ '^\s*/\*'
+	return ind + 1
+    endif
+    " Previous line was the end of block comment -> -1 after '*/' comment
+    if pline =~ '^\s*\*/'
+	return ind - 1
+    endif
+    " Check for clause head on previous line
+    if pline =~ '\%(:-\|-->\)\s*\(%.*\)\?$'
+	let ind = ind + shiftwidth()
+    " Check for end of clause on previous line
+    elseif pline =~ '\.\s*\(%.*\)\?$'
+	let ind = ind - shiftwidth()
+    endif
+    " Check for opening conditional on previous line
+    if pline =~ '^\s*\([(;]\|->\)'
+	let ind = ind + shiftwidth()
+    endif
+    " Check for closing an unclosed paren, or middle ; or ->
+    if line =~ '^\s*\([);]\|->\)'
+	let ind = ind - shiftwidth()
+    endif
+    return ind
+endfunction
+
+endif