1 files changed, 110 insertions, 0 deletions
diff --git a/runtime/indent/rhelp.vim b/runtime/indent/rhelp.vim
new file mode 100644
index 0000000..334802a
--- /dev/null
+++ b/runtime/indent/rhelp.vim
@@ -0,0 +1,110 @@
+" Vim indent file
+" Language:	R Documentation (Help), *.Rd
+" Author:	Jakson Alves de Aquino <jalvesaq@gmail.com>
+" Homepage:     https://github.com/jalvesaq/R-Vim-runtime
+" Last Change:	Mon Feb 27, 2023  07:01PM
+
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+runtime indent/r.vim
+let s:RIndent = function(substitute(&indentexpr, "()", "", ""))
+let b:did_indent = 1
+
+setlocal noautoindent
+setlocal nocindent
+setlocal nosmartindent
+setlocal nolisp
+setlocal indentkeys=0{,0},:,!^F,o,O,e
+setlocal indentexpr=GetCorrectRHelpIndent()
+
+let b:undo_indent = "setl ai< cin< inde< indk< lisp< si<"
+
+" Only define the functions once.
+if exists("*GetRHelpIndent")
+  finish
+endif
+
+function s:SanitizeRHelpLine(line)
+  let newline = substitute(a:line, '\\\\', "x", "g")
+  let newline = substitute(newline, '\\{', "x", "g")
+  let newline = substitute(newline, '\\}', "x", "g")
+  let newline = substitute(newline, '\\%', "x", "g")
+  let newline = substitute(newline, '%.*', "", "")
+  let newline = substitute(newline, '\s*$', "", "")
+  return newline
+endfunction
+
+function GetRHelpIndent()
+
+  let clnum = line(".")    " current line
+  if clnum == 1
+    return 0
+  endif
+  let cline = getline(clnum)
+
+  if cline =~ '^\s*}\s*$'
+    let i = clnum
+    let bb = -1
+    while bb != 0 && i > 1
+      let i -= 1
+      let line = s:SanitizeRHelpLine(getline(i))
+      let line2 = substitute(line, "{", "", "g")
+      let openb = strlen(line) - strlen(line2)
+      let line3 = substitute(line2, "}", "", "g")
+      let closeb = strlen(line2) - strlen(line3)
+      let bb += openb - closeb
+    endwhile
+    return indent(i)
+  endif
+
+  if cline =~ '^\s*#ifdef\>' || cline =~ '^\s*#endif\>'
+    return 0
+  endif
+
+  let lnum = clnum - 1
+  let line = getline(lnum)
+  if line =~ '^\s*#ifdef\>' || line =~ '^\s*#endif\>'
+    let lnum -= 1
+    let line = getline(lnum)
+  endif
+  while lnum > 1 && (line =~ '^\s*$' || line =~ '^#ifdef' || line =~ '^#endif')
+    let lnum -= 1
+    let line = getline(lnum)
+  endwhile
+  if lnum == 1
+    return 0
+  endif
+  let line = s:SanitizeRHelpLine(line)
+  let line2 = substitute(line, "{", "", "g")
+  let openb = strlen(line) - strlen(line2)
+  let line3 = substitute(line2, "}", "", "g")
+  let closeb = strlen(line2) - strlen(line3)
+  let bb = openb - closeb
+
+  let ind = indent(lnum) + (bb * shiftwidth())
+
+  if line =~ '^\s*}\s*$'
+    let ind = indent(lnum)
+  endif
+
+  if ind < 0
+    return 0
+  endif
+
+  return ind
+endfunction
+
+function GetCorrectRHelpIndent()
+  let lastsection = search('^\\[a-z]*{', "bncW")
+  let secname = getline(lastsection)
+  if secname =~ '^\\usage{' || secname =~ '^\\examples{' || secname =~ '^\\dontshow{' || secname =~ '^\\dontrun{' || secname =~ '^\\donttest{' || secname =~ '^\\testonly{' || secname =~ '^\\method{.*}{.*}('
+    return s:RIndent()
+  else
+    return GetRHelpIndent()
+  endif
+endfunction
+
+" vim: sw=2