patch 9.1.0778: filetype: lf config files are not recognized

Problem:  filetype: lf config files are not recognized
Solution: detect lfrc files as lf filetype, include a syntax
          script for lf files (Andis Spriņķis).

References:
- https://github.com/gokcehan/lf

closes: #15859

Signed-off-by: Andis Spriņķis <spr.andis@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/MAINTAINERS

@@ -494,6 +494,7 @@ runtime/syntax/kotlin.vim		@udalov
 runtime/syntax/kdl.vim			@imsnif @jiangyinzuo
 runtime/syntax/krl.vim			@KnoP-01
 runtime/syntax/less.vim			@genoma
+runtime/syntax/lf.vim			@andis-sprinkis
 runtime/syntax/liquid.vim		@tpope
 runtime/syntax/lua.vim			@marcuscf
 runtime/syntax/lyrics.vim		@ObserverOfTime

runtime/doc/syntax.txt

@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 9.1.  Last change: 2024 Oct 06
+*syntax.txt*	For Vim version 9.1.  Last change: 2024 Oct 13
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2223,6 +2223,20 @@ define the vim variable 'lace_case_insensitive' in your startup file: >
 	:let lace_case_insensitive=1
 
 
+LF (LFRC)		*lf.vim* *ft-lf-syntax* *g:lf_shell_syntax*
+						*b:lf_shell_syntax*
+
+For the lf file manager configuration files (lfrc) the shell commands
+syntax highlighting can be changed globally and per buffer by setting
+a different 'include' command search pattern using these variables:
+	let g:lf_shell_syntax = "syntax/dosbatch.vim"
+	let b:lf_shell_syntax = "syntax/zsh.vim"
+
+These variables are unset by default.
+
+The default 'include' command search pattern is 'syntax/sh.vim'.
+
+
 LEX						*lex.vim* *ft-lex-syntax*
 
 Lex uses brute-force synchronizing as the "^%%$" section delimiter

runtime/doc/tags

@@ -6121,6 +6121,7 @@ b:changelog_name	filetype.txt	/*b:changelog_name*
 b:clojure_syntax_keywords	syntax.txt	/*b:clojure_syntax_keywords*
 b:clojure_syntax_without_core_keywords	syntax.txt	/*b:clojure_syntax_without_core_keywords*
 b:current_syntax-variable	syntax.txt	/*b:current_syntax-variable*
+b:lf_shell_syntax	syntax.txt	/*b:lf_shell_syntax*
 b:netrw_lastfile	pi_netrw.txt	/*b:netrw_lastfile*
 b:rust_cargo_avoid_whole_workspace	ft_rust.txt	/*b:rust_cargo_avoid_whole_workspace*
 b:rust_cargo_check_all_features	ft_rust.txt	/*b:rust_cargo_check_all_features*
@@ -7331,6 +7332,7 @@ ft-json-syntax	syntax.txt	/*ft-json-syntax*
 ft-ksh-syntax	syntax.txt	/*ft-ksh-syntax*
 ft-lace-syntax	syntax.txt	/*ft-lace-syntax*
 ft-lex-syntax	syntax.txt	/*ft-lex-syntax*
+ft-lf-syntax	syntax.txt	/*ft-lf-syntax*
 ft-lifelines-syntax	syntax.txt	/*ft-lifelines-syntax*
 ft-lisp-syntax	syntax.txt	/*ft-lisp-syntax*
 ft-lite-syntax	syntax.txt	/*ft-lite-syntax*
@@ -7581,6 +7583,7 @@ g:html_use_encoding	syntax.txt	/*g:html_use_encoding*
 g:html_use_input_for_pc	syntax.txt	/*g:html_use_input_for_pc*
 g:html_use_xhtml	syntax.txt	/*g:html_use_xhtml*
 g:html_whole_filler	syntax.txt	/*g:html_whole_filler*
+g:lf_shell_syntax	syntax.txt	/*g:lf_shell_syntax*
 g:markdown_fenced_languages	syntax.txt	/*g:markdown_fenced_languages*
 g:markdown_minlines	syntax.txt	/*g:markdown_minlines*
 g:markdown_syntax_conceal	syntax.txt	/*g:markdown_syntax_conceal*
@@ -8556,6 +8559,7 @@ len()	builtin.txt	/*len()*
 less	various.txt	/*less*
 letter	print.txt	/*letter*
 lex.vim	syntax.txt	/*lex.vim*
+lf.vim	syntax.txt	/*lf.vim*
 lhaskell.vim	syntax.txt	/*lhaskell.vim*
 libcall()	builtin.txt	/*libcall()*
 libcallnr()	builtin.txt	/*libcallnr()*

runtime/filetype.vim

@@ -1315,6 +1315,9 @@ au BufNewFile,BufRead *.lean			setf lean
 " Ledger
 au BufRead,BufNewFile *.ldg,*.ledger,*.journal			setf ledger
 
+" lf configuration (lfrc)
+au BufNewFile,BufRead lfrc			setf lf
+
 " Less
 au BufNewFile,BufRead *.less			setf less
 

runtime/syntax/lf.vim

@@ -0,0 +1,236 @@
+" Vim syntax file
+" Language: lf file manager configuration file (lfrc)
+" Maintainer: Andis Sprinkis <andis@sprinkis.com>
+" Former Maintainer: Cameron Wright
+" Former URL: https://github.com/andis-sprinkis/lf-vim
+" Last Change: 13 October 2024
+"
+" The shell syntax highlighting is configurable. See $VIMRUNTIME/doc/syntax.txt
+" lf version: 32
+
+if exists("b:current_syntax")
+    finish
+endif
+
+let b:current_syntax = "lf"
+
+"{{{ Comment Matching
+syn match    lfComment        '#.*$'
+"}}}
+
+"{{{ String Matching
+syn match    lfString         "'.*'"
+syn match    lfString         '".*"' contains=lfVar,lfSpecial
+"}}}
+
+"{{{ Match lf Variables
+syn match    lfVar            '\$f\|\$fx\|\$fs\|\$id'
+"}}}
+
+"{{{ Keywords
+syn keyword  lfKeyword        set setlocal cmd map cmap skipwhite
+"}}}
+
+"{{{ Options Keywords
+syn keyword  lfOptions
+    \ quit
+    \ up
+    \ half-up
+    \ page-up
+    \ scroll-up
+    \ down
+    \ half-down
+    \ page-down
+    \ scroll-down
+    \ updir
+    \ open
+    \ jump-next
+    \ jump-prev
+    \ top
+    \ bottom
+    \ high
+    \ middle
+    \ low
+    \ toggle
+    \ invert
+    \ invert-below
+    \ unselect
+    \ glob-select
+    \ glob-unselect
+    \ calcdirsize
+    \ clearmaps
+    \ copy
+    \ cut
+    \ paste
+    \ clear
+    \ sync
+    \ draw
+    \ redraw
+    \ load
+    \ reload
+    \ echo
+    \ echomsg
+    \ echoerr
+    \ cd
+    \ select
+    \ delete
+    \ rename
+    \ source
+    \ push
+    \ read
+    \ shell
+    \ shell-pipe
+    \ shell-wait
+    \ shell-async
+    \ find
+    \ find-back
+    \ find-next
+    \ find-prev
+    \ search
+    \ search-back
+    \ search-next
+    \ search-prev
+    \ filter
+    \ setfilter
+    \ mark-save
+    \ mark-load
+    \ mark-remove
+    \ tag
+    \ tag-toggle
+    \ cmd-escape
+    \ cmd-complete
+    \ cmd-menu-complete
+    \ cmd-menu-complete-back
+    \ cmd-menu-accept
+    \ cmd-enter
+    \ cmd-interrupt
+    \ cmd-history-next
+    \ cmd-history-prev
+    \ cmd-left
+    \ cmd-right
+    \ cmd-home
+    \ cmd-end
+    \ cmd-delete
+    \ cmd-delete-back
+    \ cmd-delete-home
+    \ cmd-delete-end
+    \ cmd-delete-unix-word
+    \ cmd-yank
+    \ cmd-transpose
+    \ cmd-transpose-word
+    \ cmd-word
+    \ cmd-word-back
+    \ cmd-delete-word
+    \ cmd-delete-word-back
+    \ cmd-capitalize-word
+    \ cmd-uppercase-word
+    \ cmd-lowercase-word
+    \ anchorfind
+    \ autoquit
+    \ borderfmt
+    \ cleaner
+    \ copyfmt
+    \ cursoractivefmt
+    \ cursorparentfmt
+    \ cursorpreviewfmt
+    \ cutfmt
+    \ dircache
+    \ dircounts
+    \ dirfirst
+    \ dironly
+    \ dirpreviews
+    \ drawbox
+    \ dupfilefmt
+    \ errorfmt
+    \ filesep
+    \ findlen
+    \ globfilter
+    \ globsearch
+    \ hidden
+    \ hiddenfiles
+    \ hidecursorinactive
+    \ history
+    \ icons
+    \ ifs
+    \ ignorecase
+    \ ignoredia
+    \ incfilter
+    \ incsearch
+    \ info
+    \ infotimefmtnew
+    \ infotimefmtold
+    \ mouse
+    \ number
+    \ numberfmt
+    \ period
+    \ preserve
+    \ preview
+    \ previewer
+    \ promptfmt
+    \ ratios
+    \ relativenumber
+    \ reverse
+    \ roundbox
+    \ ruler
+    \ rulerfmt
+    \ scrolloff
+    \ selectfmt
+    \ selmode
+    \ shell
+    \ shellflag
+    \ shellopts
+    \ sixel
+    \ smartcase
+    \ smartdia
+    \ sortby
+    \ statfmt
+    \ tabstop
+    \ tagfmt
+    \ tempmarks
+    \ timefmt
+    \ truncatechar
+    \ truncatepct
+    \ waitmsg
+    \ wrapscan
+    \ wrapscroll
+    \ pre-cd
+    \ on-cd
+    \ on-select
+    \ on-redraw
+    \ on-quit
+"}}}
+
+"{{{ Special Matching
+syn match    lfSpecial        '<.*>\|\\.'
+"}}}
+
+"{{{ Shell Script Matching for cmd
+let s:shell_syntax = get(g:, 'lf_shell_syntax', "syntax/sh.vim")
+let s:shell_syntax = get(b:, 'lf_shell_syntax', s:shell_syntax)
+unlet b:current_syntax
+exe 'syn include @Shell '.s:shell_syntax
+let b:current_syntax = "lf"
+syn region   lfIgnore         start=".{{\n" end="^}}"
+    \ keepend contains=lfExternalShell,lfExternalPatch
+syn match    lfShell          '\$[a-zA-Z].*$
+    \\|:[a-zA-Z].*$
+    \\|%[a-zA-Z].*$
+    \\|![a-zA-Z].*$
+    \\|&[a-zA-Z].*$'
+    \ transparent contains=@Shell,lfExternalPatch
+syn match    lfExternalShell  "^.*$" transparent contained contains=@Shell
+syn match    lfExternalPatch  "^\s*cmd\ .*\ .{{$\|^}}$" contained
+"}}}
+
+"{{{ Link Highlighting
+hi def link  lfComment        Comment
+hi def link  lfVar            Type
+hi def link  lfSpecial        Special
+hi def link  lfString         String
+hi def link  lfKeyword        Statement
+hi def link  lfOptions        Constant
+hi def link  lfConstant       Constant
+hi def link  lfExternalShell  Normal
+hi def link  lfExternalPatch  Special
+hi def link  lfIgnore         Special
+"}}}

src/testdir/test_filetype.vim

@@ -409,6 +409,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     ledger: ['file.ldg', 'file.ledger', 'file.journal'],
     less: ['file.less'],
     lex: ['file.lex', 'file.l', 'file.lxx', 'file.l++'],
+    lf: ['lfrc'],
     lftp: ['lftp.conf', '.lftprc', 'anylftp/rc', 'lftp/rc', 'some-lftp/rc'],
     lhaskell: ['file.lhs'],
     libao: ['/etc/libao.conf', '/.libao', 'any/.libao', 'any/etc/libao.conf'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    778,
 /**/
     777,
 /**/