1 files changed, 79 insertions, 0 deletions
diff --git a/runtime/indent/objc.vim b/runtime/indent/objc.vim
new file mode 100644
index 0000000..1d10705
--- /dev/null
+++ b/runtime/indent/objc.vim
@@ -0,0 +1,79 @@
+"   Vim indent file
+"   Language:	    Objective-C
+"   Maintainer:	    Kazunobu Kuriyama <kazunobu.kuriyama@nifty.com>
+"   Last Change:    2022 Apr 06
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+setlocal cindent
+
+" Set the function to do the work.
+setlocal indentexpr=GetObjCIndent()
+
+" To make a colon (:) suggest an indentation other than a goto/switch label,
+setlocal indentkeys-=:
+setlocal indentkeys+=<:>
+
+let b:undo_indent = "setl cin< inde< indk<"
+
+" Only define the function once.
+if exists("*GetObjCIndent")
+    finish
+endif
+
+function s:GetWidth(line, regexp)
+    let end = matchend(a:line, a:regexp)
+    let width = 0
+    let i = 0
+    while i < end
+	if a:line[i] != "\t"
+	    let width = width + 1
+	else
+	    let width = width + &ts - (width % &ts)
+	endif
+	let i = i + 1
+    endwhile
+    return width
+endfunction
+
+function s:LeadingWhiteSpace(line)
+    let end = strlen(a:line)
+    let width = 0
+    let i = 0
+    while i < end
+	let char = a:line[i]
+	if char != " " && char != "\t"
+	    break
+	endif
+	if char != "\t"
+	    let width = width + 1
+	else
+	    let width = width + &ts - (width % &ts)
+	endif
+	let i = i + 1
+    endwhile
+    return width
+endfunction
+
+
+function GetObjCIndent()
+    let theIndent = cindent(v:lnum)
+
+    let prev_line = getline(v:lnum - 1)
+    let cur_line = getline(v:lnum)
+
+    if prev_line !~# ":" || cur_line !~# ":"
+	return theIndent
+    endif
+
+    if prev_line !~# ";"
+	let prev_colon_pos = s:GetWidth(prev_line, ":")
+	let delta = s:GetWidth(cur_line, ":") - s:LeadingWhiteSpace(cur_line)
+	let theIndent = prev_colon_pos - delta
+    endif
+
+    return theIndent
+endfunction