Refining just syntax a bit more

vim-just/syntax/just.vim

@@ -63,8 +63,8 @@ function! s:justSetShellName(shell_name)
 
     syn include @setshellsyntax syntax/sh.vim
   finally
-    syn region justSubshell matchgroup=justBacktick start=/\v\`/ skip=/\v\\\`/ end=/\v\`/ contains=@setshellsyntax
-    syn region justSubshell matchgroup=justBacktick start=/\v\`\`\`/ skip=/\v\\\`/ end=/\v\`\`\`/ contains=@setshellsyntax
+    syn region justSubshell matchgroup=justBacktick start="\v\`" skip="\v\\\`" end="\v\`" contains=@setshellsyntax
+    syn region justSubshell matchgroup=justBacktick start="\v\`\`\`" skip="\v\\\`" end="\v\`\`\`" contains=@setshellsyntax
   endtry
 endfunc
 
@@ -81,38 +81,47 @@ syn keyword justFunction justfile justfile_directory just_executable
 
 syn keyword justSetting shell export dotenv-load positional-arguments
 
-syn match justOperator /\v:/
-syn match justOperator /\v\)/
-syn match justOperator /\v\(/
-syn match justOperator /\v\=/
-syn match justOperator /\v:\=/
+syn match justOperator "\v:"
+syn match justOperator "\v\)"
+syn match justOperator "\v\("
+syn match justOperator "\v\+"
+syn match justOperator "\v\@"
+syn match justOperator "\v\="
+syn match justOperator "\v:\="
 
-syn match justQuote /\v"/
-syn match justQuote /\v'/
-syn match justQuote /\v"""/
-syn match justQuote /\v'''/
+syn match justQuote '\v"'
+syn match justQuote "\v'"
+syn match justQuote '\v"""'
+syn match justQuote "\v'''"
 
-syn match justBacktick /\v\`/
-syn match justBacktick /\v\`\`\`/
+syn match justBacktick "\v\`"
+syn match justBacktick "\v\`\`\`"
 
-syn match justCurlyBrace /\v\{\{/
-syn match justCurlyBrace /\v\}\}/
+syn match justCurlyBrace "\v\{\{"
+syn match justCurlyBrace "\v\}\}"
 
-syn region justCurlyBraced matchgroup=justCurlyBrace start=/\v\{\{/ skip=/\v\\\{/ end=/\v\}\}/ contains=justKeyword,justFunction,justOperator,justQuote,justString,justRawString
+syn match justComment "\v#.*$"
 
-syn region justString matchgroup=justQuote start=/\v"/ skip=/\v\\"/ end=/\v"/ contains=justCurlyBraced
-syn region justString matchgroup=justQuote start=/\v"""/ skip=/\v\\"/ end=/\v"""/ contains=justCurlyBraced
+syn match justShebang "\v^ *#!.*$"
 
-syn region justRawString matchgroup=justQuote start=/\v'/ end=/\v'/
-syn region justRawString matchgroup=justQuote start=/\v'''/ end=/\v'''/
+syn match justPublicName "\v[a-zA-Z][_a-zA-Z0-9-]*[a-zA-Z0-9_]"
+syn match justPrivateName "\v_[a-zA-Z0-9][_a-zA-Z0-9-]*[a-zA-Z0-9_]"
 
-syn region justSubshell matchgroup=justBacktick start=/\v\`/ skip=/\v\\\`/ end=/\v\`/ contains=@setshellsyntax
-syn region justSubshell matchgroup=justBacktick start=/\v\`\`\`/ skip=/\v\\\`/ end=/\v\`\`\`/ contains=@setshellsyntax
+syn region justCurlyBraced matchgroup=justCurlyBrace start="\v\{\{" skip="\v\\\{" end="\v\}\}" contains=justKeyword,justFunction,justOperator,justQuote,justString,justRawString
 
-syn match justComment /\v#.*$/
+syn region justString matchgroup=justQuote start='\v"' skip='\v\\"' end='\v"' contains=justCurlyBraced
+syn region justString matchgroup=justQuote start='\v"""' skip='\v\\"' end='\v"""' contains=justCurlyBraced
 
-syn match justShebang /\v^ *#!.*$/
+syn region justRawString matchgroup=justQuote start="\v'" end="\v'"
+syn region justRawString matchgroup=justQuote start="\v'''" end="\v'''"
 
+syn region justSubshell matchgroup=justBacktick start="\v\`" skip="\v\\\`" end="\v\`" contains=@setshellsyntax
+syn region justSubshell matchgroup=justBacktick start="\v\`\`\`" skip="\v\\\`" end="\v\`\`\`" contains=@setshellsyntax
+syn region justRecipeBody start="\v^  *" end="$" keepend contains=@setshellsyntax
+syn region justRecipeNoechoBody start="\v^  *\@" end="$" keepend contains=justOperator,@setshellsyntax
+
+hi def link justPublicName Identifier
+hi def link justPrivateName Identifier
 hi def link justKeyword Keyword
 hi def link justSetting Keyword
 hi def link justOperator Operator