Add local HLS dev setup: clangd, pragma highlighting + linting, local C-sim

Practicals/hlsdev/nvim/after/syntax/cpp.vim

@@ -0,0 +1,43 @@
+" ===========================================================================
+" HLS pragma highlighting for Vitis HLS (EMBS)
+" ---------------------------------------------------------------------------
+" Vim's stock C/C++ syntax files treat the whole "#pragma HLS ..." line as one
+" anonymous preprocessor directive, so the pragma name and its options are
+" invisible. These rules give them their own highlight groups.
+"
+" Loaded automatically when this directory is on 'runtimepath' (see the
+" hlsdev README). Safe to source twice.
+" ===========================================================================
+
+if !exists('b:current_syntax')
+    finish
+endif
+if b:current_syntax !=# 'cpp' && b:current_syntax !=# 'c'
+    finish
+endif
+
+" The pragma line as a whole, so options inside it can be picked out.
+syntax region hlsPragma
+    \ start=/#\s*pragma\s\+HLS\>/
+    \ end="$"
+    \ keepend
+    \ contains=hlsPragmaName,hlsPragmaOption,hlsPragmaValue,hlsPragmaMode
+
+" The pragma name: PIPELINE, UNROLL, ARRAY_PARTITION, INTERFACE, ...
+syntax match hlsPragmaName /\<HLS\>\s\+\zs[A-Z][A-Z_]*/ contained
+
+" Option keys: variable=, II=, type=, port=, bundle=
+syntax match hlsPragmaOption /\<\w\+\ze\s*=/ contained
+
+" Option values: complete, 2, in_words, AXILiteS
+syntax match hlsPragmaValue /=\s*\zs[^ ]\+/ contained
+
+" INTERFACE modes are positional, so they have no "mode=" in front of them:
+"   #pragma HLS INTERFACE s_axilite port=return bundle=ctrl
+syntax match hlsPragmaMode /\<\%(ap_none\|ap_vld\|ap_ack\|ap_hs\|ap_ovld\|ap_fifo\|ap_memory\|ap_bram\|bram\|ap_ctrl_none\|ap_ctrl_hs\|ap_ctrl_chain\|m_axi\|s_axilite\|axis\|s_axis\|m_axis\|ap_stable\|ap_bus\)\>/ contained
+
+highlight default link hlsPragma       PreProc
+highlight default link hlsPragmaName   Statement
+highlight default link hlsPragmaOption Identifier
+highlight default link hlsPragmaValue  Constant
+highlight default link hlsPragmaMode   Constant