1 files changed, 73 insertions, 0 deletions
diff --git a/runtime/indent/bst.vim b/runtime/indent/bst.vim
new file mode 100644
index 0000000..3dd8d71
--- /dev/null
+++ b/runtime/indent/bst.vim
@@ -0,0 +1,73 @@
+" Vim indent file
+" Language:	bst
+" Author:	Tim Pope <vimNOSPAM@tpope.info>
+" Last Change:	2022 Mar 15
+
+if exists("b:did_indent")
+    finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetBstIndent(v:lnum)
+setlocal cinkeys&
+setlocal cinkeys-=0#
+setlocal indentkeys&
+let b:undo_indent = 'setlocal indentexpr< cinkeys< indentkeys<'
+
+" Only define the function once.
+if exists("*GetBstIndent")
+    finish
+endif
+
+function! s:prevgood(lnum)
+    " Find a non-blank line above the current line.
+    " Skip over comments.
+    let lnum = a:lnum
+    while lnum > 0
+        let lnum = prevnonblank(lnum - 1)
+        if getline(lnum) !~ '^\s*%.*$'
+            break
+        endif
+    endwhile
+    return lnum
+endfunction
+
+function! s:strip(lnum)
+    let line = getline(a:lnum)
+    let line = substitute(line,'"[^"]*"','""','g')
+    let line = substitute(line,'%.*','','')
+    let line = substitute(line,'^\s\+','','')
+    return line
+endfunction
+
+function! s:count(string,char)
+    let str = substitute(a:string,'[^'.a:char.']','','g')
+    return strlen(str)
+endfunction
+
+function! GetBstIndent(lnum) abort
+    if a:lnum == 1
+        return 0
+    endif
+    let lnum = s:prevgood(a:lnum)
+    if lnum <= 0
+        return indent(a:lnum - 1)
+    endif
+    let line = s:strip(lnum)
+    let cline = s:strip(a:lnum)
+    if cline =~ '^}' && exists("b:current_syntax")
+        call cursor(a:lnum,indent(a:lnum))
+        if searchpair('{','','}','bW',"synIDattr(synID(line('.'),col('.'),1),'name') =~? 'comment\\|string'")
+            if col('.')+1 == col('$')
+                return indent('.')
+            else
+                return virtcol('.')-1
+            endif
+        endif
+    endif
+    let fakeline = substitute(line,'^}','','').matchstr(cline,'^}')
+    let ind = indent(lnum)
+    let ind = ind + shiftwidth() * s:count(line,'{')
+    let ind = ind - shiftwidth() * s:count(fakeline,'}')
+    return ind
+endfunction