Add support for PEG syntax (#615)

* feat: add pest syntax

* feat: add pest into packages

* feat: increase the package count

4 files changed, 144 insertions, 1 deletions

diff --git a/README.md b/README.md
index 89cfee95..29a54536 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ A collection of language packs for Vim.
 > One to rule them all, one to find them, one to bring them all and in the darkness bind them.
 
 - It **won't affect your startup time**, as scripts are loaded only on demand\*.
-- It **installs and updates 120+ times faster** than the <!--Package Count-->597<!--/Package Count--> packages it consists of.
+- It **installs and updates 120+ times faster** than the <!--Package Count-->598<!--/Package Count--> packages it consists of.
 - It is also more secure (scripts loaded for every filetype are generated by vim-polyglot)
 - Best syntax and indentation support (no other features). Hand-selected language packs.
 - Automatically detects indentation (includes performance-optimized version of [vim-sleuth](https://github.com/tpope/vim-sleuth), can be disabled)
@@ -138,6 +138,7 @@ On top of all language packs from [vim repository](https://github.com/vim/vim/tr
 - [odin](https://github.com/Tetralux/odin.vim) (Odin syntax highlighting for odin files)
 - [opencl](https://github.com/petRUShka/vim-opencl) (OpenCL syntax highlighting for cl and opencl files)
 - [perl](https://github.com/vim-perl/vim-perl) (Perl syntax highlighting for pl, al, cgi, fcgi, perl and 12 more files)
+- [pest](https://github.com/pest-parser/pest.vim) (PEG syntax for Rust Pest crate)
 - [pgsql](https://github.com/lifepillar/pgsql.vim) (PLpgSQL syntax highlighting for pgsql files)
 - [php](https://github.com/StanAngeloff/php.vim) (PHP syntax highlighting for php, aw, ctp, fcgi, inc and 7 more files)
 - [plantuml](https://github.com/aklt/plantuml-syntax) (PlantUML syntax highlighting for puml, iuml, plantuml, uml and pu files)
diff --git a/ftdetect/polyglot.vim b/ftdetect/polyglot.vim
index 5902b34f..a5dbf5ef 100644
--- a/ftdetect/polyglot.vim
+++ b/ftdetect/polyglot.vim
@@ -1998,6 +1998,10 @@ if !has_key(g:polyglot_is_disabled, 'requirements')
   au BufNewFile,BufRead *.pip,*require.{txt,in},*requirements.{txt,in},constraints.{txt,in} setf requirements
 endif
 
+if !has_key(g:polyglot_is_disabled, 'pest')
+  au BufNewFile,BufRead *.pest setf pest
+endif
+
 if !has_key(g:polyglot_is_disabled, 'python')
   au BufNewFile,BufRead *.cgi,*.fcgi,*.gyp,*.gypi,*.lmi,*.ptl,*.py,*.py3,*.pyde,*.pyi,*.pyp,*.pyt,*.pyw,*.rpy,*.smk,*.spec,*.tac,*.wsgi,*.xpy,{.,}gclient,{.,}pythonrc,{.,}pythonstartup,DEPS,SConscript,SConstruct,Snakefile,wscript setf python
 endif
diff --git a/packages.yaml b/packages.yaml
index 2e4cdb87..d7c23f94 100644
--- a/packages.yaml
+++ b/packages.yaml
@@ -1236,6 +1236,13 @@ filetypes:
 - name: blade
   linguist: Blade
 ---
+name: pest
+remote: pest-parser/pest.vim
+filetypes:
+- name: pest
+  extensions:
+  - pest
+---
 name: plantuml
 remote: aklt/plantuml-syntax
 filetypes:
diff --git a/syntax/pest.vim b/syntax/pest.vim
new file mode 100644
index 00000000..c151c678
--- /dev/null
+++ b/syntax/pest.vim
@@ -0,0 +1,131 @@
+" Comments
+syntax keyword pestTodo contained TODO FIXME XXX NOTE
+syntax match pestComment "\/\/.*$" contains=celTodo
+
+" Rule names
+syntax match pestName "^[a-z_][a-z0-9_]*"
+
+" String types
+syntax region pestString start=/"/ skip=/\\\\\|\\"/ end=/"/ oneline contained
+syntax region pestStringIcase start=/\^"/ skip=/\\\\\|\\"/ end=/"/ oneline contained
+syntax region pestChar start=/'/ end=/'/ oneline contained
+
+" Operators, modifiers, keywords
+syntax match pestModifier "\v[_@$!]"
+syntax match pestOperator "\v[~|*+?&!]" contained
+syntax keyword pestKeyword PUSH POP POP_ALL PEEK PEEK_ALL DROP contained
+syntax keyword pestSpecial WHITESPACE COMMENT ANY SOI EOI ASCII_DIGIT ASCII_NONZERO_DIGIT ASCII_BIN_DIGIT ASCII_OCT_DIGIT ASCII_HEX_DIGIT
+      \ ASCII_ALPHA_LOWER ASCII_ALPHA_UPPER ASCII_ALPHA ASCII_ALPHANUMERIC ASCII NEWLINE
+syntax keyword pestGeneral contained
+    \ LETTER
+    \     CASED_LETTER
+    \         UPPERCASE_LETTER
+    \         LOWERCASE_LETTER
+    \     TITLECASE_LETTER
+    \     MODIFIER_LETTER
+    \     OTHER_LETTER
+    \ MARK
+    \     NONSPACING_MARK
+    \     SPACING_MARK
+    \     ENCLOSING_MARK
+    \ NUMBER
+    \     DECIMAL_NUMBER
+    \     LETTER_NUMBER
+    \     OTHER_NUMBER
+    \ PUNCTUATION
+    \     CONNECTOR_PUNCTUATION
+    \     DASH_PUNCTUATION
+    \     OPEN_PUNCTUATION
+    \     CLOSE_PUNCTUATION
+    \     INITIAL_PUNCTUATION
+    \     FINAL_PUNCTUATION
+    \     OTHER_PUNCTUATION
+    \ SYMBOL
+    \     MATH_SYMBOL
+    \     CURRENCY_SYMBOL
+    \     MODIFIER_SYMBOL
+    \     OTHER_SYMBOL
+    \ SEPARATOR
+    \     SPACE_SEPARATOR
+    \     LINE_SEPARATOR
+    \     PARAGRAPH_SEPARATOR
+    \ OTHER
+    \     CONTROL
+    \     FORMAT
+    \     SURROGATE
+    \     PRIVATE_USE
+    \     UNASSIGNED
+syntax keyword pestBinary contained
+    \ ALPHABETIC
+    \ BIDI_CONTROL
+    \ CASE_IGNORABLE
+    \ CASED
+    \ CHANGES_WHEN_CASEFOLDED
+    \ CHANGES_WHEN_CASEMAPPED
+    \ CHANGES_WHEN_LOWERCASED
+    \ CHANGES_WHEN_TITLECASED
+    \ CHANGES_WHEN_UPPERCASED
+    \ DASH
+    \ DEFAULT_IGNORABLE_CODE_POINT
+    \ DEPRECATED
+    \ DIACRITIC
+    \ EXTENDER
+    \ GRAPHEME_BASE
+    \ GRAPHEME_EXTEND
+    \ GRAPHEME_LINK
+    \ HEX_DIGIT
+    \ HYPHEN
+    \ IDS_BINARY_OPERATOR
+    \ IDS_TRINARY_OPERATOR
+    \ ID_CONTINUE
+    \ ID_START
+    \ IDEOGRAPHIC
+    \ JOIN_CONTROL
+    \ LOGICAL_ORDER_EXCEPTION
+    \ LOWERCASE
+    \ MATH
+    \ NONCHARACTER_CODE_POINT
+    \ OTHER_ALPHABETIC
+    \ OTHER_DEFAULT_IGNORABLE_CODE_POINT
+    \ OTHER_GRAPHEME_EXTEND
+    \ OTHER_ID_CONTINUE
+    \ OTHER_ID_START
+    \ OTHER_LOWERCASE
+    \ OTHER_MATH
+    \ OTHER_UPPERCASE
+    \ PATTERN_SYNTAX
+    \ PATTERN_WHITE_SPACE
+    \ PREPENDED_CONCATENATION_MARK
+    \ QUOTATION_MARK
+    \ RADICAL
+    \ REGIONAL_INDICATOR
+    \ SENTENCE_TERMINAL
+    \ SOFT_DOTTED
+    \ TERMINAL_PUNCTUATION
+    \ UNIFIED_IDEOGRAPH
+    \ UPPERCASE
+    \ VARIATION_SELECTOR
+    \ WHITE_SPACE
+    \ XID_CONTINUE
+    \ XID_START
+syntax keyword pestForbidden abstract alignof as become box break const continue crate do else enum extern false
+      \ final fn for if impl in let loop macro match mod move mut offsetof override priv proc pure pub ref return
+      \ Self self sizeof static struct super trait true type typeof unsafe unsized use virtual where while yield 
+
+" Rule blocks
+syntax region pestBlock start=/{/ end=/}/ fold transparent contains=pestString,pestStringIcase,pestChar,pestOperator,pestKeyword,pestSpecial,pestGeneral,pestBinary,pestForbidden,pestComment,pestBlock
+syntax region pestRule start=/^/ end=/ / fold transparent contains=pestName,pestForbidden,pestComment
+
+highlight default link pestTodo Todo
+highlight default link pestComment Comment
+highlight default link pestString String
+highlight default link pestStringIcase String
+highlight default link pestChar Character
+highlight default link pestName Identifier
+highlight default link pestModifier Operator
+highlight default link pestOperator Operator
+highlight default link pestKeyword Keyword
+highlight default link pestSpecial Type
+highlight default link pestGeneral Type
+highlight default link pestBinary Type
+highlight default link pestForbidden Error