Update runtime files

runtime/indent/vb.vim

@@ -1,8 +1,12 @@
 " Vim indent file
 " Language:	VisualBasic (ft=vb) / Basic (ft=basic) / SaxBasic (ft=vb)
 " Author:	Johannes Zellner <johannes@zellner.org>
+" Maintainer:	Michael Soyka (mssr953@gmail.com)
 " Last Change:	Fri, 18 Jun 2004 07:22:42 CEST
 "		Small update 2010 Jul 28 by Maxim Kim
+"		2022/12/15: add support for multiline statements.
+"		2022/12/21: move VbGetIndent from global to script-local scope
+"		2022/12/26: recognize "Type" keyword
 
 if exists("b:did_indent")
     finish
@@ -10,28 +14,33 @@ endif
 let b:did_indent = 1
 
 setlocal autoindent
-setlocal indentexpr=VbGetIndent(v:lnum)
+setlocal indentexpr=s:VbGetIndent(v:lnum)
 setlocal indentkeys&
-setlocal indentkeys+==~else,=~elseif,=~end,=~wend,=~case,=~next,=~select,=~loop,<:>
+setlocal indentkeys+==~else,=~elseif,=~end,=~wend,=~case,=~next,=~select,=~loop
 
 let b:undo_indent = "set ai< indentexpr< indentkeys<"
 
 " Only define the function once.
-if exists("*VbGetIndent")
+if exists("*s:VbGetIndent")
     finish
 endif
 
-fun! VbGetIndent(lnum)
+function s:VbGetIndent(lnum)
+    let this_lnum = a:lnum
+    let this_line = getline(this_lnum)
+
     " labels and preprocessor get zero indent immediately
-    let this_line = getline(a:lnum)
     let LABELS_OR_PREPROC = '^\s*\(\<\k\+\>:\s*$\|#.*\)'
     if this_line =~? LABELS_OR_PREPROC
 	return 0
     endif
+    
+    " Get the current value of "shiftwidth"
+    let bShiftwidth = shiftwidth()
 
     " Find a non-blank line above the current line.
     " Skip over labels and preprocessor directives.
-    let lnum = a:lnum
+    let lnum = this_lnum
     while lnum > 0
 	let lnum = prevnonblank(lnum - 1)
 	let previous_line = getline(lnum)
@@ -45,34 +54,102 @@ fun! VbGetIndent(lnum)
 	return 0
     endif
 
-    let ind = indent(lnum)
+    " Variable "previous_line" now contains the text in buffer line "lnum".
+
+    " Multi-line statements have the underscore character at end-of-line:
+    "
+    "    object.method(arguments, _
+    "                  arguments, _
+    "                  arguments)
+    "
+    " and require extra logic to determine the correct indentation.
+    "
+    " Case 1: Line "lnum" is the first line of a multiline statement.
+    "         Line "lnum" will have a trailing underscore character
+    "         but the preceding non-blank line does not.
+    "         Line "this_lnum" will be indented relative to "lnum".
+    "
+    " Case 2: Line "lnum" is the last line of a multiline statement.
+    "         Line "lnum" will not have a trailing underscore character
+    "         but the preceding non-blank line will.
+    "         Line "this_lnum" will have the same indentation as the starting
+    "         line of the multiline statement.
+    "
+    " Case 3: Line "lnum" is neither the first nor last line.  
+    "         Lines "lnum" and "lnum-1" will have a trailing underscore
+    "         character.
+    "         Line "this_lnum" will have the same indentation as the preceding
+    "         line.
+    "
+    " No matter which case it is, the starting line of the statement must be
+    " found.  It will be assumed that multiline statements cannot have
+    " intermingled comments, statement labels, preprocessor directives or
+    " blank lines.
+    "
+    let lnum_is_continued = (previous_line =~ '_$')
+    if lnum > 1
+	let before_lnum = prevnonblank(lnum-1)
+	let before_previous_line = getline(before_lnum)
+    else
+	let before_lnum = 0
+	let before_previous_line = ""
+    endif
+
+    if before_previous_line !~ '_$'
+	" Variable "previous_line" contains the start of a statement.
+	"
+	let ind = indent(lnum)
+	if lnum_is_continued
+	    let ind += bShiftwidth
+	endif
+    elseif ! lnum_is_continued
+	" Line "lnum" contains the last line of a multiline statement.
+        " Need to find where this multiline statement begins
+	"
+	while before_lnum > 0
+	    let before_lnum -= 1
+	    if getline(before_lnum) !~ '_$'
+		let before_lnum += 1
+		break
+	    endif
+	endwhile
+	if before_lnum == 0
+	    let before_lnum = 1
+	endif
+	let previous_line = getline(before_lnum)
+	let ind = indent(before_lnum)
+    else
+	" Line "lnum" is not the first or last line of a multiline statement.
+	"
+	let ind = indent(lnum)
+    endif
 
     " Add
-    if previous_line =~? '^\s*\<\(begin\|\%(\%(private\|public\|friend\)\s\+\)\=\%(function\|sub\|property\)\|select\|case\|default\|if\|else\|elseif\|do\|for\|while\|enum\|with\)\>'
-	let ind = ind + shiftwidth()
+    if previous_line =~? '^\s*\<\(begin\|\%(\%(private\|public\|friend\)\s\+\)\=\%(function\|sub\|property\|enum\|type\)\|select\|case\|default\|if\|else\|elseif\|do\|for\|while\|with\)\>'
+	let ind = ind + bShiftwidth
     endif
 
     " Subtract
     if this_line =~? '^\s*\<end\>\s\+\<select\>'
 	if previous_line !~? '^\s*\<select\>'
-	    let ind = ind - 2 * shiftwidth()
+	    let ind = ind - 2 * bShiftwidth
 	else
 	    " this case is for an empty 'select' -- 'end select'
 	    " (w/o any case statements) like:
 	    "
 	    " select case readwrite
 	    " end select
-	    let ind = ind - shiftwidth()
+	    let ind = ind - bShiftwidth
 	endif
     elseif this_line =~? '^\s*\<\(end\|else\|elseif\|until\|loop\|next\|wend\)\>'
-	let ind = ind - shiftwidth()
+	let ind = ind - bShiftwidth
     elseif this_line =~? '^\s*\<\(case\|default\)\>'
 	if previous_line !~? '^\s*\<select\>'
-	    let ind = ind - shiftwidth()
+	    let ind = ind - bShiftwidth
 	endif
     endif
 
     return ind
-endfun
+endfunction
 
 " vim:sw=4