feat: add hledger (#1121)

README.md

@@ -422,6 +422,7 @@ Haskell
 Haxe
 Hcl
 Hex
+hledger
 Hlsl
 HolyC
 Html

languages.json

@@ -883,6 +883,13 @@
       "nested": true,
       "extensions": ["lean", "hlean"]
     },
+    "Hledger": {
+      "name": "hledger",
+      "line_comment": [";", "#"],
+      "multi_line_comments": [["comment", "end comment"]],
+      "nested": false,
+      "extensions": ["hledger"]
+    },
     "Less": {
       "name": "LESS",
       "line_comment": ["//"],

tests/data/hledger.hledger

@@ -0,0 +1,18 @@
+# 18 lines 6 code 10 comments 2 blanks
+# a comment
+; another comment
+
+; ^ a blank line
+comment
+account assets             ; Declare valid account names and display order.
+a block comment
+end comment
+
+account assets:savings     ; A subaccount. This one represents a bank account.
+account assets:checking    ; Another. Note, 2+ spaces after the account name.
+account assets:receivable  ; Accounting type is inferred from english names,
+account passifs            ; or declared with a "type" tag, type:L
+account expenses           ; type:X
+                           ; A follow-on comment line, indented.
+account expenses:rent      ; Expense and revenue categories are also accounts.
+                           ; Subaccounts inherit their parent's type.