Introduce new syntax highlighting stdlib (#51810)

Having this as a standard library allows for syntax highlighting to be
used in the Markdown and REPL standard libraries. As a bonus, this
provides an easy and canonical way of obtaining syntax highlighted code
across the ecosystem.

This is a pretty tiny library, at just ~200 lines, but a useful one.

NEWS.md

@@ -109,6 +109,12 @@ Standard library changes
 * The new `@styled_str` string macro provides a convenient way of creating a
   `AnnotatedString` with various faces or other attributes applied ([#49586]).
 
+#### JuliaSyntaxHighlighting
+
+* A new standard library for applying syntax highlighting to Julia code, this
+  uses `JuliaSyntax` and `StyledStrings` to implement a `highlight` function
+  that creates an `AnnotatedString` with syntax highlighting applied.
+
 #### Package Manager
 
 #### LinearAlgebra

deps/checksums/JuliaSyntaxHighlighting-4110caaf4fcdf0c614fd3ecd7c5bf589ca82ac63.tar.gz/md5

@@ -0,0 +1 @@
+08230d0801fda3c81927d558452215e4

deps/checksums/JuliaSyntaxHighlighting-4110caaf4fcdf0c614fd3ecd7c5bf589ca82ac63.tar.gz/sha512

@@ -0,0 +1 @@
+0386841dcf30ee53f7f95dd3206e1208482507d157aa09739873de2a56e5ca3d7bbf27eccd9f4ed81c1c0fea229673475f6454fe94df0ff960563ca4c29ed36c

pkgimage.mk

@@ -94,6 +94,7 @@ $(eval $(call stdlib_builder,Printf,Unicode))
 $(eval $(call stdlib_builder,Random,SHA))
 $(eval $(call stdlib_builder,Tar,ArgTools,SHA))
 $(eval $(call stdlib_builder,DelimitedFiles,Mmap))
+$(eval $(call stdlib_builder,JuliaSyntaxHighlighting,))
 
 # 2-depth packages
 $(eval $(call stdlib_builder,LLD_jll,Zlib_jll libLLVM_jll Artifacts Libdl))

stdlib/.gitignore

@@ -27,6 +27,8 @@
 /Distributed
 /StyledStrings-*
 /StyledStrings
+/JuliaSyntaxHighlighting-*
+/JuliaSyntaxHighlighting
 /*_jll/StdlibArtifacts.toml
 /*/Manifest.toml
 /*.image

stdlib/JuliaSyntaxHighlighting.version

@@ -0,0 +1,4 @@
+JULIASYNTAXHIGHLIGHTING_BRANCH = main
+JULIASYNTAXHIGHLIGHTING_SHA1 = 4110caaf4fcdf0c614fd3ecd7c5bf589ca82ac63
+JULIASYNTAXHIGHLIGHTING_GIT_URL := https://github.com/julialang/JuliaSyntaxHighlighting.jl.git
+JULIASYNTAXHIGHLIGHTING_TAR_URL = https://api.github.com/repos/julialang/JuliaSyntaxHighlighting.jl/tarball/$1

stdlib/Makefile

@@ -47,7 +47,8 @@ STDLIBS = Artifacts Base64 CRC32c Dates FileWatching \
           $(JLL_NAMES)
 
 STDLIBS_EXT = Pkg Statistics LazyArtifacts LibCURL DelimitedFiles Downloads ArgTools \
-              Tar NetworkOptions SuiteSparse SparseArrays StyledStrings SHA Distributed
+              Tar NetworkOptions SuiteSparse SparseArrays StyledStrings SHA Distributed \
+              JuliaSyntaxHighlighting
 
 $(foreach module, $(STDLIBS_EXT), $(eval $(call stdlib-external,$(module),$(shell echo $(module) | tr a-z A-Z))))
 

stdlib/stdlib.mk

@@ -4,9 +4,9 @@ STDLIBS_WITHIN_SYSIMG := \
 
 INDEPENDENT_STDLIBS := \
 	ArgTools Base64 CRC32c Dates DelimitedFiles Distributed Downloads Future \
-	InteractiveUtils LazyArtifacts LibGit2 LibCURL Logging Markdown Mmap \
-	NetworkOptions Profile Printf Pkg REPL Serialization SharedArrays SparseArrays \
-	Statistics StyledStrings Tar Test TOML Unicode UUIDs \
+	InteractiveUtils JuliaSyntaxHighlighting LazyArtifacts LibGit2 LibCURL Logging \
+    Markdown Mmap NetworkOptions Profile Printf Pkg REPL Serialization SharedArrays \
+    SparseArrays Statistics StyledStrings Tar Test TOML Unicode UUIDs \
 	dSFMT_jll GMP_jll libLLVM_jll LLD_jll LLVMLibUnwind_jll LibUnwind_jll LibUV_jll \
 	LibCURL_jll LibSSH2_jll LibGit2_jll nghttp2_jll  MozillaCACerts_jll MbedTLS_jll \
 	MPFR_jll OpenLibm_jll PCRE2_jll p7zip_jll Zlib_jll