From 4e867a309271f69a0f5a7bba13832a86552405da Mon Sep 17 00:00:00 2001
From: carrexxii <154758622+carrexxii@users.noreply.github.com>
Date: Thu, 4 Jul 2024 17:33:26 +0200
Subject: Add Nim string interpolation syntax highlighting (#448)

* Add Nim string interpolation syntax highlighting

* Use frontier matches

* Bump version number for language_nim
---
 manifest.json            |  2 +-
 plugins/language_nim.lua | 27 +++++++++++++++++++++++++--
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/manifest.json b/manifest.json
index 5b60f9f..da44c61 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1311,7 +1311,7 @@
       "tags": [
         "language"
       ],
-      "version": "0.1"
+      "version": "0.2"
     },
     {
       "description": "Syntax for the [Nix](https://nixos.wiki/wiki/Overview_of_the_Nix_Language) expression language",
diff --git a/plugins/language_nim.lua b/plugins/language_nim.lua
index d7726d1..425544e 100644
--- a/plugins/language_nim.lua
+++ b/plugins/language_nim.lua
@@ -88,14 +88,37 @@ for _, type in ipairs(standard_generic_types) do
   table.insert(patterns, { pattern = type.." +%f[%w]", type = "keyword2" })
 end
 
+local function string_pattern(start, stop, syntax)
+  return {
+    pattern = { start, stop, '\\' },
+    type    = "string",
+    syntax  = syntax and {
+      patterns = syntax,
+      symbols  = {},
+    } or nil
+  }
+end
+
+local interpolation_syntax = {
+  { pattern = { '{{', '}}' }, type = "string" },
+  { pattern = { '{', '}', '\\' }, type = "keyword2", syntax = ".nim" },
+  { pattern = "[%S][%w]*", type = "string" },
+}
+
 local user_patterns = {
   -- comments
   { pattern = { "##?%[", "]##?" },            type = "comment" },
   { pattern = "##?.-\n",                      type = "comment" },
   -- strings and chars
-  { pattern = { '"', '"', '\\' },             type = "string" },
-  { pattern = { '"""', '"""[^"]' },           type = "string" },
   { pattern = { "'", "'", '\\' },             type = "literal" },
+  string_pattern('"""', '"""%f[^"]'),
+  string_pattern('"'  , '"'        ),
+  string_pattern('\\"', '\\"'      ), -- For highlighting strings inside iterpolated blocks
+  -- string interpolation
+  string_pattern('%&"""' , '"""%f[^"]', interpolation_syntax),
+  string_pattern('fmt"""', '"""%f[^"]', interpolation_syntax),
+  string_pattern('%&"'   , '"'        , interpolation_syntax),
+  string_pattern('fmt"'  , '"'        , interpolation_syntax),
   -- function calls
   { pattern = "[a-zA-Z][a-zA-Z0-9_]*%f[(]",   type = "function" },
   -- identifiers
-- 
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