add better multiline golang injection

this changes the golang match strategy to match within a string instead
of detecting the starting string delimiter.

this means constructs like
query := `
	select from my_table
`

are now automatically detected.

Author: Jarrad Whitaker

package.json

@@ -57,7 +57,6 @@
                 "scopeName": "inline-sql.injection",
                 "injectTo": [
                     "source.python",
-                    "source.go",
                     "source.java",
                     "source.ruby",
                     "source.cs",
@@ -117,6 +116,16 @@
                     "meta.embedded.sql": "sql",
                     "meta.template.expression.ts": "typescript"
                 }
+            },
+            {
+                "path": "./syntaxes/golang-multiline.json",
+                "scopeName": "golang-multiline.injection",
+                "injectTo": [
+                    "source.go"
+                ],
+                "embeddedLanguages": {
+                    "meta.embedded.sql": "sql"
+                }
             }
         ],
         "configuration": {

syntaxes/golang-multiline.json

@@ -0,0 +1,23 @@
+{
+    "scopeName": "golang-multiline.injection",
+    "fileTypes": [
+        "go"
+    ],
+    "injectionSelector": [
+        "L:string.quoted.raw.go -comment"
+    ],
+    "patterns": [
+        {
+            "name": "meta.embedded.sql",
+            "begin": "\\s*((?i)(select|with|insert|update|create table|create index)(?=\\s))|(--\\w+)",
+            "end": "(?=`)",
+            "beginCaptures": {
+            "2": { "name": "keyword.other.DML.sql" },
+            "3": { "name": "comment.line.double-dash.sql" }
+            },
+            "patterns": [
+                { "include": "source.sql" }
+            ]
+        }
+    ]
+}

syntaxes/highlight-sql-string.json

@@ -2,7 +2,6 @@
     "scopeName": "inline-sql.injection",
     "fileTypes": [
         "py",
-        "go",
         "js",
         "jsx",
         "ts",

test/testdata/multiline.go

@@ -12,8 +12,8 @@ select * from book where id = 34;
 `
 
 	notQuery := `
-SELECT This is not a query and should not be considered
-as one as --sql comment is not present.
+SELECT This a query and should be considered
+as one even though --sql comment is not present.
 Also, I hate manual testing.;
 `
 
@@ -32,7 +32,17 @@ select * from book where id = 34;
 
 	more5 := `SELECT * from book;`
 
-	print(query, another, more, notQuery, more2, more3, more4, more5)
+	more6 := `
+		SELECT * from book;
+	`
+
+	more7 := `
+		with hihi as (
+
+		)
+	`
+
+	print(query, another, more, notQuery, more2, more3, more4, more5, more6, more7)
 }
 
 func add(a, b int) int {