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+" Vim indent file
+" Language: Perl
+" Maintainer: vim-perl <vim-perl@googlegroups.com>
+" Homepage: https://github.com/vim-perl/vim-perl
+" Bugs/requests: https://github.com/vim-perl/vim-perl/issues
+" License: Vim License (see :help license)
+" Last Change: 2022 Jun 14
+
+" Suggestions and improvements by :
+" Aaron J. Sherman (use syntax for hints)
+" Artem Chuprina (play nice with folding)
+
+" TODO things that are not or not properly indented (yet) :
+" - Continued statements
+" print "foo",
+" "bar";
+" print "foo"
+" if bar();
+" - Multiline regular expressions (m//x)
+" (The following probably needs modifying the perl syntax file)
+" - qw() lists
+" - Heredocs with terminators that don't match \I\i*
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+" Is syntax highlighting active ?
+let b:indent_use_syntax = has("syntax")
+
+setlocal indentexpr=GetPerlIndent()
+setlocal indentkeys+=0=,0),0],0=or,0=and
+if !b:indent_use_syntax
+ setlocal indentkeys+=0=EO
+endif
+
+let b:undo_indent = "setl inde< indk<"
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+function! GetPerlIndent()
+
+ " Get the line to be indented
+ let cline = getline(v:lnum)
+
+ " Indent POD markers to column 0
+ if cline =~ '^\s*=\L\@!'
+ return 0
+ endif
+
+ " Get current syntax item at the line's first char
+ let csynid = ''
+ if b:indent_use_syntax
+ let csynid = synIDattr(synID(v:lnum,1,0),"name")
+ endif
+
+ " Don't reindent POD and heredocs
+ if csynid == "perlPOD" || csynid == "perlHereDoc" || csynid =~ "^pod"
+ return indent(v:lnum)
+ endif
+
+ " Indent end-of-heredocs markers to column 0
+ if b:indent_use_syntax
+ " Assumes that an end-of-heredoc marker matches \I\i* to avoid
+ " confusion with other types of strings
+ if csynid == "perlStringStartEnd" && cline =~ '^\I\i*$'
+ return 0
+ endif
+ else
+ " Without syntax hints, assume that end-of-heredocs markers begin with EO
+ if cline =~ '^\s*EO'
+ return 0
+ endif
+ endif
+
+ " Now get the indent of the previous perl line.
+
+ " Find a non-blank line above the current line.
+ let lnum = prevnonblank(v:lnum - 1)
+ " Hit the start of the file, use zero indent.
+ if lnum == 0
+ return 0
+ endif
+ let line = getline(lnum)
+ let ind = indent(lnum)
+ " Skip heredocs, POD, and comments on 1st column
+ if b:indent_use_syntax
+ let skippin = 2
+ while skippin
+ let synid = synIDattr(synID(lnum,1,0),"name")
+ if (synid == "perlStringStartEnd" && line =~ '^\I\i*$')
+ \ || (skippin != 2 && synid == "perlPOD")
+ \ || (skippin != 2 && synid == "perlHereDoc")
+ \ || synid == "perlComment"
+ \ || synid =~ "^pod"
+ let lnum = prevnonblank(lnum - 1)
+ if lnum == 0
+ return 0
+ endif
+ let line = getline(lnum)
+ let ind = indent(lnum)
+ let skippin = 1
+ else
+ let skippin = 0
+ endif
+ endwhile
+ else
+ if line =~ "^EO"
+ let lnum = search("<<[\"']\\=EO", "bW")
+ let line = getline(lnum)
+ let ind = indent(lnum)
+ endif
+ endif
+
+ " Indent blocks enclosed by {}, (), or []
+ if b:indent_use_syntax
+ " Find a real opening brace
+ " NOTE: Unlike Perl character classes, we do NOT need to escape the
+ " closing brackets with a backslash. Doing so just puts a backslash
+ " in the character class and causes sorrow. Instead, put the closing
+ " bracket as the first character in the class.
+ let braceclass = '[][(){}]'
+ let bracepos = match(line, braceclass, matchend(line, '^\s*[])}]'))
+ while bracepos != -1
+ let synid = synIDattr(synID(lnum, bracepos + 1, 0), "name")
+ " If the brace is highlighted in one of those groups, indent it.
+ " 'perlHereDoc' is here only to handle the case '&foo(<<EOF)'.
+ if synid == ""
+ \ || synid == "perlMatchStartEnd"
+ \ || synid == "perlHereDoc"
+ \ || synid == "perlBraces"
+ \ || synid == "perlStatementIndirObj"
+ \ || synid == "perlSubDeclaration"
+ \ || synid =~ "^perlFiledescStatement"
+ \ || synid =~ '^perl\(Sub\|Block\|Package\)Fold'
+ let brace = strpart(line, bracepos, 1)
+ if brace == '(' || brace == '{' || brace == '['
+ let ind = ind + shiftwidth()
+ else
+ let ind = ind - shiftwidth()
+ endif
+ endif
+ let bracepos = match(line, braceclass, bracepos + 1)
+ endwhile
+ let bracepos = matchend(cline, '^\s*[])}]')
+ if bracepos != -1
+ let synid = synIDattr(synID(v:lnum, bracepos, 0), "name")
+ if synid == ""
+ \ || synid == "perlMatchStartEnd"
+ \ || synid == "perlBraces"
+ \ || synid == "perlStatementIndirObj"
+ \ || synid =~ '^perl\(Sub\|Block\|Package\)Fold'
+ let ind = ind - shiftwidth()
+ endif
+ endif
+ else
+ if line =~ '[{[(]\s*\(#[^])}]*\)\=$'
+ let ind = ind + shiftwidth()
+ endif
+ if cline =~ '^\s*[])}]'
+ let ind = ind - shiftwidth()
+ endif
+ endif
+
+ " Indent lines that begin with 'or' or 'and'
+ if cline =~ '^\s*\(or\|and\)\>'
+ if line !~ '^\s*\(or\|and\)\>'
+ let ind = ind + shiftwidth()
+ endif
+ elseif line =~ '^\s*\(or\|and\)\>'
+ let ind = ind - shiftwidth()
+ endif
+
+ return ind
+
+endfunction
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim:ts=8:sts=4:sw=4:expandtab:ft=vim