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runtime(filetype): improve *.h filetype detection
This commit changes *.h files to default to C (instead of C++), and deprecates the existing `g:c_syntax_for_h` and `g:ch_syntax_for_h` variables in favor of a unified `g:filetype_h`, like is used for other ambiguous file extensions. closes: #17135 Signed-off-by: Amelia Clarke <selene@perilune.dev> Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Amelia Clarke
Christian Brabandt
parent
5ecb452f5b
commit
3041cf67d3
37
runtime/autoload/dist/ft.vim
vendored
37
runtime/autoload/dist/ft.vim
vendored
@ -3,7 +3,7 @@ vim9script
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# Vim functions for file type detection
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#
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# Maintainer: The Vim Project <https://github.com/vim/vim>
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# Last Change: 2025 Apr 15
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# Last Change: 2025 Apr 19
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# Former Maintainer: Bram Moolenaar <Bram@vim.org>
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# These functions are moved here from runtime/filetype.vim to make startup
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@ -203,19 +203,36 @@ export def FTlpc()
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setf c
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enddef
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export def FTheader()
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if match(getline(1, min([line("$"), 200])), '^@\(interface\|end\|class\)') > -1
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if exists("g:c_syntax_for_h")
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setf objc
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else
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setf objcpp
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# Searches within the first `maxlines` lines of the file for distinctive
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# Objective-C or C++ syntax and returns the appropriate filetype. Returns a
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# null_string if the search was inconclusive.
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def CheckObjCOrCpp(maxlines = 100): string
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var n = 1
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while n < maxlines && n <= line('$')
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const line = getline(n)
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if line =~ '\v^\s*\@%(class|interface|end)>'
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return 'objcpp'
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elseif line =~ '\v^\s*%(class|namespace|template|using)>'
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return 'cpp'
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endif
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elseif exists("g:c_syntax_for_h")
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++n
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endwhile
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return null_string
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enddef
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# Determines whether a *.h file is C, C++, Ch, or Objective-C/Objective-C++.
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export def FTheader()
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if exists('g:filetype_h')
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execute $'setf {g:filetype_h}'
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elseif exists('g:c_syntax_for_h')
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setf c
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elseif exists("g:ch_syntax_for_h")
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elseif exists('g:ch_syntax_for_h')
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setf ch
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else
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setf cpp
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# Search the first 100 lines of the file for distinctive Objective-C or C++
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# syntax and set the filetype accordingly. Otherwise, use C as the default
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# filetype.
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execute $'setf {CheckObjCOrCpp() ?? 'c'}'
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endif
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enddef
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@ -1,4 +1,4 @@
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*filetype.txt* For Vim version 9.1. Last change: 2025 Apr 16
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*filetype.txt* For Vim version 9.1. Last change: 2025 Apr 19
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VIM REFERENCE MANUAL by Bram Moolenaar
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@ -153,7 +153,11 @@ variables can be used to overrule the filetype used for certain extensions:
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*.f g:filetype_f |ft-forth-syntax|
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*.frm g:filetype_frm |ft-form-syntax|
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*.fs g:filetype_fs |ft-forth-syntax|
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*.h g:c_syntax_for_h |ft-c-syntax|
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*.h g:c_syntax_for_h |ft-c-syntax| (deprecated)
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*.h g:ch_syntax_for_h |ft-ch-syntax| (deprecated)
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*.h g:filetype_h |ft-c-syntax|
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|ft-ch-syntax|
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|ft-cpp-syntax|
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*.i g:filetype_i |ft-progress-syntax|
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*.inc g:filetype_inc
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*.lsl g:filetype_lsl
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@ -1,4 +1,4 @@
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*syntax.txt* For Vim version 9.1. Last change: 2025 Apr 15
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*syntax.txt* For Vim version 9.1. Last change: 2025 Apr 19
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VIM REFERENCE MANUAL by Bram Moolenaar
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@ -1056,8 +1056,12 @@ Variable Highlight ~
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*c_ansi_typedefs* ... but do standard ANSI types
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*c_ansi_constants* ... but do standard ANSI constants
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*c_no_utf* don't highlight \u and \U in strings
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*c_syntax_for_h* for *.h files use C syntax instead of C++ and use objc
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syntax instead of objcpp
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*c_syntax_for_h* use C syntax for *.h files instead of C++/ObjC/ObjC++
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(NOTE: This variable is deprecated and no longer
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necessary, as *.h files now default to C, unless the
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file contains C++ or Objective-C syntax. If the
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automated detection fails, the default filetype can
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be adjusted using `g:filetype_h`.)
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*c_no_if0* don't highlight "#if 0" blocks as comments
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*c_no_cformat* don't highlight %-formats in strings
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*c_no_c99* don't highlight C99 standard items
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@ -1116,8 +1120,11 @@ the C syntax file. See |c.vim| for all the settings that are available for C.
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By setting a variable you can tell Vim to use Ch syntax for *.h files, instead
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of C or C++: >
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:let ch_syntax_for_h = 1
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:let g:filetype_h = 'ch'
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NOTE: In previous versions of Vim, the following (now-deprecated) variable was
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used, but is no longer the preferred approach: >
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:let ch_syntax_for_h = 1
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CHILL *chill.vim* *ft-chill-syntax*
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@ -1,7 +1,7 @@
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" Vim support file to detect file types
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"
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" Maintainer: The Vim Project <https://github.com/vim/vim>
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" Last Change: 2025 Apr 18
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" Last Change: 2025 Apr 19
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" Former Maintainer: Bram Moolenaar <Bram@vim.org>
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" Listen very carefully, I will say this only once
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@ -436,9 +436,8 @@ au BufNewFile,BufRead *.ixx,*.mpp setf cpp
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" https://clang.llvm.org/docs/StandardCPlusPlusModules.html#file-name-requirement
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au BufNewFile,BufRead *.cppm,*.ccm,*.cxxm,*.c++m setf cpp
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" .h files can be C, Ch C++, ObjC or ObjC++.
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" Set c_syntax_for_h if you want C, ch_syntax_for_h if you want Ch. ObjC is
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" detected automatically.
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" .h files can be C, C++, Ch, Objective-C, or Objective-C++.
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" Set g_filetype_h to set a different filetype
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au BufNewFile,BufRead *.h call dist#ft#FTheader()
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" Ch (CHscript)
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