feat: Add COBOL support

Author: andrewferrier

README.md

@@ -25,7 +25,7 @@ the language you're editing.
 [vim-debugstring](https://github.com/bergercookie/vim-debugstring); updated for
 the NeoVim generation. It:
 
-*   Supports 34 filetypes/programming languages out-of-the-box, including
+*   Supports 35 filetypes/programming languages out-of-the-box, including
     Python, JavaScript/TypeScript, Java, C/C++ and
     [more](#feature-comparison-with-similar-plugins). [It can also be extended to
     support other languages or customize existing ones](SHOWCASE.md).
@@ -236,6 +236,7 @@ they are used to convert sections to ROT-13, which most folks don't use.
 | C#                                                                  | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |
 | C++                                                                 | :+1:              | :x:                                                     | :x:                                                            | :+1:                                                      | :+1:                                                                 | :+1:                                                | :x:                                                   |
 | CMake                                                               | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |
+| Cobol                                                               | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |
 | dart                                                                | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |
 | Docker                                                              | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |
 | DOS/Windows Batch                                                   | :+1:              | :x:                                                     | :x:                                                            | :x:                                                       | :x:                                                                  | :x:                                                 | :x:                                                   |

lua/debugprint/filetypes.lua

@@ -87,6 +87,12 @@ return {
         mid_var = "${",
         right_var = '}")',
     },
+    ["cobol"] = {
+        left = 'DISPLAY "',
+        right = '".',
+        mid_var = '" ',
+        right_var = ".",
+    },
     ["cpp"] = {
         left = 'std::cerr << "',
         right = '" << std::endl;',