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vim9script
# Script to fix preprocessor indentation in Vim's C source code.
#
# Usage: Vim -S <this-file>
#
# Specifications:
# - If there is no indentation on the line containing the preprocessor
# directive (`#`) following the first `#if~`, the indentation amount is
# `nesting level - 1` spaces. Otherwise, the indentation amount is `nesting
# level` spaces.
# - However, if a preprocessor directive line is detected after the
# corresponding `#endif` of the above `#if~`, the indentation amount is
# fixed at `nesting level` and the line is reprocessed from the first line.
# - If the preprocessor directive line ends with a line continuation (`\`) and
# the next line is blank, the line continuation (`\`) and the next line are
# deleted.
#
# Author: Hirohito Higashi (@h-east)
# Last Update: 2026 Jan 12
def Get_C_source_files(): list<string>
var list_of_c_files: list<string> = []
if empty(list_of_c_files)
var fpath = '../../src'
var list = glob(fpath .. '/*.[ch]', 0, 1) + [fpath .. '/xxd/xxd.c']
# Some files are auto-generated, so skip those
list_of_c_files = filter(list, (i, v) => v !~ 'dlldata.c\|if_ole.h\|iid_ole.c')
endif
return list_of_c_files
enddef
def FixPreprocessorIndent(fname: string)
execute 'edit! ' .. fname
var nest: number = 0
var indent_offset: number = 0 # -1 if whole-file guard detected
var first_if_seen: bool = false
var offset_determined: bool = false
var whole_file_guard_ended = false
# First pass: remove trailing backslash + empty next line
var lnum = 1
while lnum <= line('$')
var line: string = getline(lnum)
if line =~# '^\s*#.*\\$'
var next_line: string = getline(lnum + 1)
if next_line =~# '^\s*$'
# Remove backslash from current line and delete next line
setline(lnum, substitute(line, '\s*\\$', '', ''))
deletebufline('%', lnum + 1)
continue # Don't increment, check same line again
endif
endif
lnum += 1
endwhile
# Second pass: fix preprocessor indent
while true
var is_reprocess: bool = false
for l in range(1, line('$'))
var line: string = getline(l)
# Skip if not a preprocessor directive
if line !~# '^\s*#'
continue
endif
# Extract directive and current indent
var match_li: list<string> = matchlist(line, '^\(\s*\)#\(\s*\)\(\w\+\)')
if empty(match_li)
continue
endif
var cur_spaces: string = !empty(match_li[1]) ? match_li[1] : match_li[2]
var directive: string = match_li[3]
# If indent_offset != 0 but we encounter indented #, it's not whole-file
# guard. Reprocess from line 1 with indent_offset=0
if whole_file_guard_ended && offset_determined && indent_offset != 0
indent_offset = 0
nest = 0
is_reprocess = true
break
endif
# After first #if, determine offset from first nested directive
# Only check if # is at column 1 (no leading spaces)
if first_if_seen && !offset_determined
offset_determined = true
if empty(cur_spaces)
# No indent after first `#if` --> whole-file guard style
indent_offset = -1
endif
endif
# Determine expected indent based on directive type
var expected_indent: number
if directive ==# 'if' || directive ==# 'ifdef' || directive ==# 'ifndef'
if !first_if_seen
first_if_seen = true
endif
expected_indent = nest + indent_offset
nest += 1
elseif directive ==# 'elif' || directive ==# 'else'
expected_indent = nest - 1 + indent_offset
elseif directive ==# 'endif'
nest -= 1
if nest <= 0
# Reset for next top-level block (but keep offset_determined)
nest = 0
whole_file_guard_ended = true
endif
expected_indent = nest + indent_offset
else
# Other directives (#define, #include, #error, #pragma, etc.)
expected_indent = nest + indent_offset
endif
if expected_indent < 0
expected_indent = 0
endif
# Build expected line
var rest = substitute(line, '^\s*#\s*', '', '')
var expected_line: string
expected_line = '#' .. repeat(' ', expected_indent) .. rest
# Update line if different
if line !=# expected_line
setline(l, expected_line)
endif
endfor
if !is_reprocess
break
endif
endwhile
update
enddef
# Main
for fname in Get_C_source_files()
FixPreprocessorIndent(fname)
endfor
qall!
# vim: et ts=2 sw=0
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