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-rw-r--r--runtime/indent/postscr.vim69
1 files changed, 69 insertions, 0 deletions
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+" PostScript indent file
+" Language: PostScript
+" Maintainer: Mike Williams <mrw@eandem.co.uk>
+" 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 indentexpr=PostscrIndentGet(v:lnum)
+setlocal indentkeys+=0],0=>>,0=%%,0=end,0=restore,0=grestore indentkeys-=:,0#,e
+
+let b:undo_indent = "setl inde< indk<"
+
+" Catch multiple instantiations
+if exists("*PostscrIndentGet")
+ finish
+endif
+
+function! PostscrIndentGet(lnum)
+ " Find a non-empty non-comment line above the current line.
+ " Note: ignores DSC comments as well!
+ let lnum = a:lnum - 1
+ while lnum != 0
+ let lnum = prevnonblank(lnum)
+ if getline(lnum) !~ '^\s*%.*$'
+ break
+ endif
+ let lnum = lnum - 1
+ endwhile
+
+ " Hit the start of the file, use user indent.
+ if lnum == 0
+ return -1
+ endif
+
+ " Start with the indent of the previous line
+ let ind = indent(lnum)
+ let pline = getline(lnum)
+
+ " Indent for dicts, arrays, and saves with possible trailing comment
+ if pline =~ '\(begin\|<<\|g\=save\|{\|[\)\s*\(%.*\)\=$'
+ let ind = ind + shiftwidth()
+ endif
+
+ " Remove indent for popped dicts, and restores.
+ if pline =~ '\(end\|g\=restore\)\s*$'
+ let ind = ind - shiftwidth()
+
+ " Else handle immediate dedents of dicts, restores, and arrays.
+ elseif getline(a:lnum) =~ '\(end\|>>\|g\=restore\|}\|]\)'
+ let ind = ind - shiftwidth()
+
+ " Else handle DSC comments - always start of line.
+ elseif getline(a:lnum) =~ '^\s*%%'
+ let ind = 0
+ endif
+
+ " For now catch excessive left indents if they occur.
+ if ind < 0
+ let ind = -1
+ endif
+
+ return ind
+endfunction
+
+" vim:sw=2