From 8634bd46b26f28fa26950128b0cc585560bd6a9a Mon Sep 17 00:00:00 2001
From: Christian Clason <c.clason@uni-graz.at>
Date: Mon, 20 Jan 2025 22:45:47 +0100
Subject: vim-patch:9.1.1042: filetype: just files are not recognized

Problem:  filetype: just files are not recognized
Solution: adjust filetype detection pattern, detect just shebang line,
          include just ftplugin, indent and syntax plugin
          (Peter Benjamin)

closes: vim/vim#16466

https://github.com/vim/vim/commit/72755b3c8e91ec90447969b736f080e0de36003d

Co-authored-by: Peter Benjamin <petermbenjamin@gmail.com>
---
 runtime/ftplugin/just.vim           |  17 ++
 runtime/indent/just.vim             |  51 +++++
 runtime/lua/vim/filetype.lua        |   5 +
 runtime/lua/vim/filetype/detect.lua |   1 +
 runtime/syntax/just.vim             | 406 ++++++++++++++++++++++++++++++++++++
 test/old/testdir/test_filetype.vim  |   1 +
 6 files changed, 481 insertions(+)
 create mode 100644 runtime/ftplugin/just.vim
 create mode 100644 runtime/indent/just.vim
 create mode 100644 runtime/syntax/just.vim

diff --git a/runtime/ftplugin/just.vim b/runtime/ftplugin/just.vim
new file mode 100644
index 0000000000..6f2acddf96
--- /dev/null
+++ b/runtime/ftplugin/just.vim
@@ -0,0 +1,17 @@
+" Vim ftplugin file
+" Language:	Justfile
+" Maintainer:	Peter Benjamin <@pbnj>
+" Last Change:	2025 Jan 19
+" Credits:	The original author, Noah Bogart <https://github.com/NoahTheDuke/vim-just/>
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal iskeyword+=-
+setlocal comments=n:#
+setlocal commentstring=#\ %s
+
+let b:undo_ftplugin = "setlocal iskeyword< comments< commentstring<"
diff --git a/runtime/indent/just.vim b/runtime/indent/just.vim
new file mode 100644
index 0000000000..d7f82b118f
--- /dev/null
+++ b/runtime/indent/just.vim
@@ -0,0 +1,51 @@
+" Vim indent file
+" Language:	Justfile
+" Maintainer:	Peter Benjamin <@pbnj>
+" Last Change:	2025 Jan 19
+" Credits:	The original author, Noah Bogart <https://github.com/NoahTheDuke/vim-just/>
+
+" Only load this indent file when no other was loaded yet.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetJustfileIndent()
+setlocal indentkeys=0},0),!^F,o,O,0=''',0=\"\"\"
+
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
+if exists("*GetJustfileIndent")
+  finish
+endif
+
+function GetJustfileIndent()
+  if v:lnum < 2
+    return 0
+  endif
+
+  let prev_line = getline(v:lnum - 1)
+  let last_indent = indent(v:lnum - 1)
+
+  if getline(v:lnum) =~ "\\v^\\s+%([})]|'''$|\"\"\"$)"
+    return last_indent - shiftwidth()
+  elseif prev_line =~ '\V#'
+    return last_indent
+  elseif prev_line =~ "\\v%([:{(]|^.*\\S.*%([^']'''|[^\"]\"\"\"))\\s*$"
+    return last_indent + shiftwidth()
+  elseif prev_line =~ '\\$'
+    if v:lnum == 2 || getline(v:lnum - 2) !~ '\\$'
+      if prev_line =~ '\v:\=@!'
+        return last_indent + shiftwidth() + shiftwidth()
+      else
+        return last_indent + shiftwidth()
+      endif
+    endif
+  elseif v:lnum > 2 && getline(v:lnum - 2) =~ '\\$'
+    return last_indent - shiftwidth()
+  elseif prev_line =~ '\v:\s*%(\h|\()' && prev_line !~ '\V:='
+    return last_indent + shiftwidth()
+  endif
+
+  return last_indent
+endfunction
diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 37e6227090..a8f3d18bfa 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -661,6 +661,8 @@ local extension = {
   jsp = 'jsp',
   jl = 'julia',
   just = 'just',
+  Just = 'just',
+  JUST = 'just',
   kl = 'karel',
   KL = 'karel',
   kdl = 'kdl',
@@ -1650,8 +1652,11 @@ local filename = {
   ['.vsconfig'] = 'jsonc',
   ['bun.lock'] = 'jsonc',
   ['.justfile'] = 'just',
+  ['.Justfile'] = 'just',
+  ['.JUSTFILE'] = 'just',
   ['justfile'] = 'just',
   ['Justfile'] = 'just',
+  ['JUSTFILE'] = 'just',
   Kconfig = 'kconfig',
   ['Kconfig.debug'] = 'kconfig',
   ['Config.in'] = 'kconfig',
diff --git a/runtime/lua/vim/filetype/detect.lua b/runtime/lua/vim/filetype/detect.lua
index 31c88c80bd..855893530e 100644
--- a/runtime/lua/vim/filetype/detect.lua
+++ b/runtime/lua/vim/filetype/detect.lua
@@ -1877,6 +1877,7 @@ local patterns_hashbang = {
   ruby = 'ruby',
   ['node\\(js\\)\\=\\>\\|js\\>'] = { 'javascript', { vim_regex = true } },
   ['rhino\\>'] = { 'javascript', { vim_regex = true } },
+  just = 'just',
   -- BC calculator
   ['^bc\\>'] = { 'bc', { vim_regex = true } },
   ['sed\\>'] = { 'sed', { vim_regex = true } },
diff --git a/runtime/syntax/just.vim b/runtime/syntax/just.vim
new file mode 100644
index 0000000000..77423a3c91
--- /dev/null
+++ b/runtime/syntax/just.vim
@@ -0,0 +1,406 @@
+" Vim syntax file
+" Language:	Justfile
+" Maintainer:	Peter Benjamin <@pbnj>
+" Last Change:	2025 Jan 19
+" Credits:	The original author, Noah Bogart <https://github.com/NoahTheDuke/vim-just/>
+
+if exists('b:current_syntax')
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+let b:current_syntax = 'just'
+
+" syncing fromstart prevents mismatched highlighting when jumping around in a justfile
+" linebreaks= keeps multi-line constructs highlighted correctly while typing
+syn sync fromstart linebreaks=10
+
+" a-zA-Z0-9_-
+syn iskeyword @,48-57,_,-
+
+syn match justComment "#.*$" contains=@Spell,justCommentTodo
+syn match justCommentInBody '#.*$' contained contains=justCommentTodo,justInterpolation,@justOtherCurlyBraces
+syn keyword justCommentTodo TODO FIXME XXX contained
+syn match justShebang "^\s*#!.*$" contains=justInterpolation,@justOtherCurlyBraces
+syn match justName "\h\k*" contained
+syn match justFunction "\h\k*" contained
+
+syn match justPreBodyComment "\v%(\s|\\\n)*%([^\\]\n)@3<!#%([^!].*)?\n%(\t+| +)@=" transparent contained contains=justComment
+   \ nextgroup=@justBodies skipnl
+
+syn region justBacktick start=/`/ end=/`/
+syn region justBacktick start=/```/ end=/```/
+syn region justRawString start=/'/ end=/'/
+syn region justRawString start=/'''/ end=/'''/
+syn region justString start=/"/ skip=/\\\\\|\\"/ end=/"/ contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError
+syn region justString start=/"""/ skip=/\\\\\|\\"/ end=/"""/ contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError
+
+syn region justShellExpandRawString start=/\v\k@1<!x'/ end=/'/
+   \ contains=justShellExpandVarRaw,justDollarEscape
+syn region justShellExpandRawString start=/\v\k@1<!x'''/ end=/'''/
+   \ contains=justShellExpandVarRaw,justDollarEscape
+syn region justShellExpandString
+   \ start=/\v\k@1<!x"/ skip=/\\\\\|\\"/ end=/"/
+   \ contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError,justShellExpandVar,justDollarEscape,justDollarEscapeSplit
+syn region justShellExpandString
+   \ start=/\v\k@1<!x"""/ skip=/\\\\\|\\"/ end=/"""/
+   \ contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError,justShellExpandVar,justDollarEscape,justDollarEscapeSplit
+
+syn cluster justStringLiterals
+   \ contains=justRawString,justString,justShellExpandRawString,justShellExpandString
+syn cluster justAllStrings contains=justBacktick,@justStringLiterals
+
+syn match justRegexReplacement
+   \ /\v,%(\_s|\\\n)*%('\_[^']*'|'''%(\_.%(''')@!)*\_.?''')%(\_s|\\\n)*%(,%(\_s|\\\n)*)?\)/me=e-1
+   \ transparent contained contains=@justExpr,@justStringsWithRegexCapture
+syn match justRegexReplacement
+   \ /\v,%(\_s|\\\n)*%("%(\_[^"]|\\")*"|"""%(\_.%(""")@!)*\_.?""")%(\_s|\\\n)*%(,%(\_s|\\\n)*)?\)/me=e-1
+   \ transparent contained contains=@justExpr,@justStringsWithRegexCapture
+
+syn region justRawStrRegexRepl start=/\v'/ end=/'/ contained contains=justRegexCapture,justDollarEscape
+syn region justRawStrRegexRepl start=/\v'''/ end=/'''/ contained contains=justRegexCapture,justDollarEscape
+syn region justStringRegexRepl start=/\v"/ skip=/\\\\\|\\"/ end=/"/ contained contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError,justRegexCapture,justDollarEscape,justDollarEscapeSplit
+syn region justStringRegexRepl start=/\v"""/ skip=/\\\\\|\\"/ end=/"""/ contained contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError,justRegexCapture,justDollarEscape,justDollarEscapeSplit
+syn match justRegexCapture '\v\$%(\w+|\{\w+\})' contained
+syn cluster justStringsWithRegexCapture contains=justRawStrRegexRepl,justStringRegexRepl
+
+syn cluster justRawStrings contains=justRawString,justRawStrRegexRepl
+
+syn region justStringInsideBody start=/\v\\@1<!'/ end=/'/ contained contains=justInterpolation,@justOtherCurlyBraces,justIndentError
+syn region justStringInsideBody start=/\v\\@1<!"/ skip=/\v\\@1<!\\"/ end=/"/ contained contains=justInterpolation,@justOtherCurlyBraces,justIndentError
+syn region justStringInShebangBody start=/\v\\@1<!'/ end=/'/ contained contains=justInterpolation,@justOtherCurlyBraces,justShebangIndentError
+syn region justStringInShebangBody start=/\v\\@1<!"/ skip=/\v\\@1<!\\"/ end=/"/ contained contains=justInterpolation,@justOtherCurlyBraces,justShebangIndentError
+
+syn match justStringEscapeError '\\.' contained
+syn match justStringEscapeSequence '\v\\[tnr"\\]' contained
+syn match justStringUEscapeSequence '\v\\u\{[0-9A-Fa-f]{1,6}\}' contained
+
+syn match justAssignmentOperator "\V:=" contained
+
+syn region justExprParen start='\V(' end='\V)' transparent contains=@justExpr
+syn region justExprParenInInterp start='\V(' end='\V)' transparent contained contains=@justExprInInterp
+
+syn match justRecipeAt "^@" contained
+syn match justRecipeColon ":" contained
+
+syn region justRecipeAttributes
+   \ matchgroup=justRecipeAttr start='\v^%(\\\n)@3<!\[' end='\V]'
+   \ contains=justRecipeAttr,justRecipeAttrSep,justRecipeAttrArgs,justRecipeAttrArgError,justRecipeAttrValueShort
+
+syn keyword justRecipeAttr
+   \ confirm doc extension group linux macos no-cd no-exit-message no-quiet openbsd positional-arguments private script unix windows working-directory
+   \ contained
+syn match justRecipeAttrSep ',' contained
+syn match justRecipeAttrValueShort '\v:%(\_s|\\\n)*' transparent contained
+   \ contains=justRecipeAttrValueColon nextgroup=@justStringLiterals,justInvalidAttrValue
+syn match justRecipeAttrValueColon '\V:' contained
+syn region justRecipeAttrArgs matchgroup=justRecipeAttr start='\V(' end='\V)' contained
+   \ contains=@justStringLiterals
+syn match justRecipeAttrArgError '\v\(%(\s|\\?\n)*\)' contained
+
+syn match justInvalidAttrValue '\v[^"',]["']@![^,\]]*' contained
+
+syn match justRecipeDeclSimple "\v^\@?\h\k*%(%(\s|\\\n)*:\=@!)@="
+   \ transparent contains=justRecipeName
+   \ nextgroup=justRecipeNoDeps,justRecipeDeps
+
+syn region justRecipeDeclComplex start="\v^\@?\h\k*%(\s|\\\n)+%([+*$]+%(\s|\\\n)*)*\h" end="\v%(:\=@!)@=|$"
+   \ transparent
+   \ contains=justRecipeName,justParameter
+   \ nextgroup=justRecipeNoDeps,justRecipeDeps
+
+syn match justRecipeName "\v^\@?\h\k*" transparent contained contains=justRecipeAt,justFunction
+
+syn match justParameter "\v%(\s|\\\n)@3<=%(%([*+]%(\s|\\\n)*)?%(\$%(\s|\\\n)*)?|\$%(\s|\\\n)*[*+]%(\s|\\\n)*)\h\k*"
+   \ transparent contained
+   \ contains=justName,justVariadicPrefix,justParamExport,justVariadicPrefixError
+   \ nextgroup=justPreParamValue
+
+syn match justPreParamValue '\v%(\s|\\\n)*\=%(\s|\\\n)*'
+   \ contained transparent
+   \ contains=justParameterOperator
+   \ nextgroup=justParamValue
+
+syn region justParamValue contained transparent
+   \ start="\v\S"
+   \ skip="\\\n"
+   \ end="\v%(\s|^)%([*+$:]|\h)@=|:@=|$"
+   \ contains=@justAllStrings,justRecipeParenDefault,@justExprFunc
+   \ nextgroup=justParameterError
+syn match justParameterOperator "\V=" contained
+
+syn match justVariadicPrefix "\v%(\s|\\\n)@3<=[*+]%(%(\s|\\\n)*\$?%(\s|\\\n)*\h)@=" contained
+syn match justParamExport '\V$' contained
+syn match justVariadicPrefixError "\v\$%(\s|\\\n)*[*+]" contained
+
+syn match justParameterError "\v%(%([+*$]+%(\s|\\\n)*)*\h\k*)@>%(%(\s|\\\n)*\=)@!" contained
+
+syn region justRecipeParenDefault
+   \ matchgroup=justRecipeDepParamsParen start='\v%(\=%(\s|\\\n)*)@<=\(' end='\V)'
+   \ contained
+   \ contains=@justExpr
+syn match justRecipeSubsequentDeps '\V&&' contained
+
+syn match justRecipeNoDeps '\v:%(\s|\\\n)*\n|:#@=|:%(\s|\\\n)+#@='
+   \ transparent contained
+   \ contains=justRecipeColon
+   \ nextgroup=justPreBodyComment,@justBodies
+syn region justRecipeDeps start="\v:%(\s|\\\n)*%([a-zA-Z_(]|\&\&)" skip='\\\n' end="\v#@=|\\@1<!\n"
+   \ transparent contained
+   \ contains=justFunction,justRecipeColon,justRecipeSubsequentDeps,justRecipeParamDep
+   \ nextgroup=justPreBodyComment,@justBodies
+
+syn region justRecipeParamDep contained transparent
+   \ matchgroup=justRecipeDepParamsParen
+   \ start="\V("
+   \ end="\V)"
+   \ contains=justRecipeDepParenName,@justExpr
+
+syn keyword justBoolean true false contained
+
+syn match justAssignment "\v^\h\k*%(\s|\\\n)*:\=" transparent contains=justAssignmentOperator
+
+syn match justSet '\v^set' contained
+syn keyword justSetKeywords
+   \ allow-duplicate-recipes allow-duplicate-variables dotenv-load dotenv-filename dotenv-path dotenv-required export fallback ignore-comments positional-arguments quiet script-interpreter shell tempdir unstable windows-shell working-directory
+   \ contained
+syn keyword justSetDeprecatedKeywords windows-powershell contained
+syn match justBooleanSet "\v^set%(\s|\\\n)+%(allow-duplicate-%(recip|variabl)es|dotenv-%(loa|require)d|export|fallback|ignore-comments|positional-arguments|quiet|unstable|windows-powershell)%(%(\s|\\\n)*:\=%(\s|\\\n)*%(true|false))?%(\s|\\\n)*%($|#@=)"
+   \ contains=justSet,justSetKeywords,justSetDeprecatedKeywords,justAssignmentOperator,justBoolean
+   \ transparent
+
+syn match justStringSet '\v^set%(\s|\\\n)+\k+%(\s|\\\n)*:\=%(\s|\\\n)*%(x?['"])@=' transparent contains=justSet,justSetKeywords,justAssignmentOperator
+
+syn match justShellSet
+   \ "\v^set%(\s|\\\n)+%(s%(hell|cript-interpreter)|windows-shell)%(\s|\\\n)*:\=%(\s|\\\n)*\[@="
+   \ contains=justSet,justSetKeywords,justAssignmentOperator
+   \ transparent skipwhite
+   \ nextgroup=justShellSetValue
+syn region justShellSetValue
+   \ start='\V[' end='\V]'
+   \ contained
+   \ contains=@justStringLiterals,justShellSetError
+
+syn match justShellSetError '\v\k+['"]@!' contained
+
+syn match justAlias '\v^alias' contained
+syn match justAliasDecl "\v^alias%(\s|\\\n)+\h\k*%(\s|\\\n)*:\=%(\s|\\\n)*"
+   \ transparent
+   \ contains=justAlias,justFunction,justAssignmentOperator
+   \ nextgroup=justAliasRes
+syn match justAliasRes '\v\h\k*%(\s|\\\n)*%(#@=|$)' contained transparent contains=justFunction
+
+syn match justExportedAssignment "\v^export%(\s|\\\n)+\h\k*%(\s|\\\n)*:\=" transparent
+   \ contains=justExport,justAssignmentOperator
+
+syn match justExport '\v^export' contained
+
+syn match justUnexportStatement '\v^unexport%(\s|\\\n)+\w+\s*$' contains=justUnexport
+syn match justUnexport '\v^unexport' contained
+
+syn keyword justConditional if else
+syn region justConditionalBraces start="\v\{\{@!" end="\v\}@=" transparent contains=@justExpr
+syn region justConditionalBracesInInterp start="\v\{\{@!" end="\v\}@=" transparent contained contains=@justExprInInterp
+
+syn match justLineLeadingSymbol "\v^%(\\\n)@3<!\s+\zs%(\@-|-\@|\@|-)"
+
+syn match justLineContinuation "\\$"
+   \ containedin=ALLBUT,justComment,justCommentInBody,justShebang,@justRawStrings,justRecipeAttrArgError,justShellExpandRawDefaultValue
+
+syn region justBody
+   \ start=/\v^\z( +|\t+)%(#!)@!\S/
+   \ skip='\v\\\n|\n\s*$'
+   \ end="\v\n\z1@!|%(^\S)@2<=\_.@="
+   \ contains=justInterpolation,@justOtherCurlyBraces,justLineLeadingSymbol,justCommentInBody,justStringInsideBody,justIndentError
+   \ contained
+
+syn region justShebangBody
+   \ start="\v^\z( +|\t+)#!"
+   \ skip='\v\\\n|\n\s*$'
+   \ end="\v\n\z1@!|%(^\S)@2<=\_.@="
+   \ contains=justInterpolation,@justOtherCurlyBraces,justCommentInBody,justShebang,justStringInShebangBody,justShebangIndentError
+   \ contained
+
+syn cluster justBodies contains=justBody,justShebangBody
+
+syn match justIndentError '\v^%(\\\n)@3<!%( +\zs\t|\t+\zs )\s*\S@='
+syn match justShebangIndentError '\v^ +\zs\t\s*\S@='
+
+syn region justInterpolation
+   \ matchgroup=justInterpolationDelim
+   \ start="\v\{\{\{@!" end="\v%(%(\\\n\s|\S)\s*)@<=\}\}|$"
+   \ matchgroup=justInterpError end='^\S'
+   \ contained
+   \ contains=@justExprInInterp
+
+syn match justBadCurlyBraces '\v\{{3}\ze[^{]' contained
+syn match justCurlyBraces '\v\{{4}' contained
+syn match justBadCurlyBraces '\v\{{5}\ze[^{]' contained
+syn cluster justOtherCurlyBraces contains=justCurlyBraces,justBadCurlyBraces
+
+syn match justFunctionCall "\v\w+%(\s|\\\n)*\(@=" transparent contains=justBuiltInFunction
+
+" error() is intentionally not included in this list
+syn keyword justBuiltInFunction
+   \ absolute_path append arch blake3 blake3_file cache_dir cache_directory canonicalize capitalize choose clean config_dir config_directory config_local_dir config_local_directory data_dir data_directory data_local_dir data_local_directory datetime datetime_utc encode_uri_component env env_var env_var_or_default executable_dir executable_directory extension file_name file_stem home_dir home_directory invocation_dir invocation_dir_native invocation_directory invocation_directory_native is_dependency join just_executable just_pid justfile justfile_dir justfile_directory kebabcase lowercamelcase lowercase module_dir module_directory module_file num_cpus os os_family parent_dir parent_directory path_exists prepend quote replace replace_regex semver_matches sha256 sha256_file shell shoutykebabcase shoutysnakecase snakecase source_dir source_directory source_file style titlecase trim trim_end trim_end_match trim_end_matches trim_start trim_start_match trim_start_matches uppercamelcase uppercase uuid without_extension
+   \ contained
+
+syn match justUserDefinedError "\v%(assert|error)%(%(\s|\\\n)*\()@="
+
+syn match justReplaceRegex '\vreplace_regex%(\s|\\\n)*\(@=' transparent contains=justBuiltInFunction nextgroup=justReplaceRegexCall
+syn match justReplaceRegexInInterp '\vreplace_regex%(\s|\\\n)*\(@=' transparent contained contains=justBuiltInFunction nextgroup=justReplaceRegexCallInInterp
+
+syn region justReplaceRegexCall
+   \ matchgroup=justReplaceRegexCall
+   \ start='\V(' end='\V)'
+   \ transparent contained
+   \ contains=@justExpr,justRegexReplacement
+syn region justReplaceRegexCallInInterp
+   \ matchgroup=justReplaceRegexCall
+   \ start='\V(' end='\V)'
+   \ transparent contained
+   \ contains=@justExprInInterp,justRegexReplacement
+
+syn match justParameterLineContinuation '\v%(\s|\\\n)*' contained nextgroup=justParameterError
+
+syn match justRecipeDepParenName '\v%(\(\n?)@3<=%(\_s|\\\n)*\h\k*'
+   \ transparent contained
+   \ contains=justFunction
+
+syn cluster justBuiltInFunctions contains=justFunctionCall,justUserDefinedError
+
+syn match justConditionalOperator "\V=="
+syn match justConditionalOperator "\V!="
+syn match justConditionalOperator "\V=~"
+
+syn match justOperator "\V+"
+syn match justOperator "\V/"
+syn match justOperator "\V&&"
+syn match justOperator "\V||"
+
+syn keyword justConstant
+   \ HEX HEXLOWER HEXUPPER
+   \ CLEAR NORMAL BOLD ITALIC UNDERLINE INVERT HIDE STRIKETHROUGH
+   \ BLACK RED GREEN YELLOW BLUE MAGENTA CYAN WHITE
+   \ BG_BLACK BG_RED BG_GREEN BG_YELLOW BG_BLUE BG_MAGENTA BG_CYAN BG_WHITE
+
+syn match justShellExpandVarRaw '\v\$%(\{\_[^}]*\}|\w+)' contained contains=justShellExpandRawDefaultDelimiter
+syn match justShellExpandRawDefaultDelimiter '\V:-' contained nextgroup=justShellExpandRawDefaultValue
+syn match justShellExpandRawDefaultValue '\v\_[^}]*' contained
+syn match justShellExpandVar '\v\$%(\w|\\\n\s*)+' contained
+syn region justShellExpandVar start='\v\$%(\\\n\s*)*\{' end='\V}' contains=justShellExpandDefaultDelimiter,justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError
+syn match justShellExpandDefaultDelimiter '\v:%(\\\n\s*)*-@=' contained nextgroup=justShellExpandDefault
+syn region justShellExpandDefault
+   \ matchgroup=justShellExpandDefaultDelimiter start='\V-' end='\v\}@='
+   \ contained
+   \ contains=justStringEscapeSequence,justStringUEscapeSequence,justStringEscapeError
+
+syn match justDollarEscape '\V$$' contained
+syn match justDollarEscapeSplit '\v\$%(\\\n\s*)*\$' contained
+
+syn cluster justExprBase contains=@justAllStrings,@justBuiltInFunctions,justConditional,justConditionalOperator,justOperator,justConstant
+syn cluster justExpr contains=@justExprBase,justExprParen,justConditionalBraces,justReplaceRegex
+syn cluster justExprInInterp contains=@justExprBase,justName,justExprParenInInterp,justConditionalBracesInInterp,justReplaceRegexInInterp
+
+syn cluster justExprFunc contains=@justBuiltInFunctions,justReplaceRegex,justExprParen
+
+syn match justImport /\v^import%(%(\s|\\\n)*\?|%(\s|\\\n)+%(x?['"])@=)/ transparent
+   \ contains=justImportStatement,justOptionalFile
+syn match justImportStatement '^import' contained
+
+syn match justOldInclude "^!include"
+
+syn match justModule /\v^mod%(%(\s|\\\n)*\?)?%(\s|\\\n)+\h\k*\s*%($|%(\s|\\\n)*%(x?['"]|#)@=)/
+   \ transparent contains=justModStatement,justName,justOptionalFile
+syn match justModStatement '^mod' contained
+
+syn match justOptionalFile '\V?' contained
+
+" Most linked colorscheme colors are chosen based on semantics of the color name.
+" Some are for parity with other syntax files (for example, Number for recipe body highlighting
+" is to align with the make.vim distributed with Vim).
+" Deprecated `just` syntaxes are highlighted as Underlined.
+"
+" Colors are linked 'def'(ault) so that users who prefer other colors
+" can override them, e.g. in ~/.vim/after/syntax/just.vim
+"
+" Note that vim-just's highlight groups are an implementation detail and may be subject to change.
+
+" The list of highlight links is sorted alphabetically.
+
+hi def link justAlias                            Statement
+hi def link justAssignmentOperator               Operator
+hi def link justBacktick                         Special
+hi def link justBadCurlyBraces                   Error
+hi def link justBody                             Number
+hi def link justBoolean                          Boolean
+hi def link justBuiltInFunction                  Function
+hi def link justComment                          Comment
+hi def link justCommentInBody                    Comment
+hi def link justCommentTodo                      Todo
+hi def link justConditional                      Conditional
+hi def link justConditionalOperator              Conditional
+hi def link justConstant                         Constant
+hi def link justCurlyBraces                      Special
+hi def link justDollarEscape                     Special
+hi def link justDollarEscapeSplit                Special
+hi def link justExport                           Statement
+hi def link justFunction                         Function
+hi def link justImportStatement                  Include
+hi def link justIndentError                      Error
+hi def link justInterpError                      Error
+hi def link justInterpolation                    Normal
+hi def link justInterpolationDelim               Delimiter
+hi def link justInvalidAttrValue                 Error
+hi def link justLineContinuation                 Special
+hi def link justLineLeadingSymbol                Special
+hi def link justModStatement                     Keyword
+hi def link justName                             Identifier
+hi def link justOldInclude                       Error
+hi def link justOperator                         Operator
+hi def link justOptionalFile                     Conditional
+hi def link justParameterError                   Error
+hi def link justParameterOperator                Operator
+hi def link justParamExport                      Statement
+hi def link justRawString                        String
+hi def link justRawStrRegexRepl                  String
+hi def link justRecipeAt                         Special
+hi def link justRecipeAttr                       Type
+hi def link justRecipeAttrArgError               Error
+hi def link justRecipeAttrSep                    Operator
+hi def link justRecipeAttrValueColon             Operator
+hi def link justRecipeColon                      Operator
+hi def link justRecipeDepParamsParen             Delimiter
+hi def link justRecipeSubsequentDeps             Delimiter
+hi def link justRegexCapture                     Identifier
+hi def link justSet                              Statement
+hi def link justSetDeprecatedKeywords            Underlined
+hi def link justSetKeywords                      Keyword
+hi def link justShebang                          SpecialComment
+hi def link justShebangBody                      Number
+hi def link justShebangIndentError               Error
+hi def link justShellExpandDefault               Character
+hi def link justShellExpandDefaultDelimiter      Operator
+hi def link justShellExpandRawDefaultDelimiter   Operator
+hi def link justShellExpandRawDefaultValue       Character
+hi def link justShellExpandRawString             String
+hi def link justShellExpandString                String
+hi def link justShellExpandVar                   PreProc
+hi def link justShellExpandVarRaw                PreProc
+hi def link justShellSetError                    Error
+hi def link justString                           String
+hi def link justStringEscapeError                Error
+hi def link justStringEscapeSequence             Special
+hi def link justStringInShebangBody              String
+hi def link justStringInsideBody                 String
+hi def link justStringRegexRepl                  String
+hi def link justStringUEscapeSequence            Special
+hi def link justUnexport                         Statement
+hi def link justUserDefinedError                 Exception
+hi def link justVariadicPrefix                   Statement
+hi def link justVariadicPrefixError              Error
+
+let &cpo = s:cpo_sav
+unlet s:cpo_sav
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index e39b93eea4..9398cea786 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -997,6 +997,7 @@ func s:GetScriptChecks() abort
       \ 'expect': [['#!/path/expect']],
       \ 'execline': [['#!/sbin/execlineb -S0'], ['#!/usr/bin/execlineb']],
       \ 'gnuplot': [['#!/path/gnuplot']],
+      \ 'just': [['#!/path/just']],
       \ 'make': [['#!/path/make']],
       \ 'nix': [['#!/path/nix-shell']],
       \ 'pike': [['#!/path/pike'],
-- 
cgit