Add new config latex-workshop.latex.extraExts

This variable lists all the file extensions that LW will consider as
LaTeX files.

package.json

@@ -1100,6 +1100,15 @@
           "default": "%DIR%",
           "markdownDescription": "The directory where the extension tries to find project files (e.g., PDF and SyncTeX files) are located. Both relative and absolute paths are supported. Relative path start from the root file location, so beware if it is located in sub-directory. The path must not contain a trailing slash. The LaTeX toolchain should output files to this path. For a list of supported placeholders, please visit https://github.com/James-Yu/LaTeX-Workshop/wiki/Compile#placeholders. Note that if this config is set to %DIR% (default value) or %DIR_W32%, the extension will try to parse the last LaTeX tools used and look for `-out-directory=` and `-outdir=`, and automatically determine the output directory. This means that you can safely ignore this config if you use `latexmk` and do not manually `mv` the output files in your recipe."
         },
+        "latex-workshop.latex.extraExts": {
+          "scope": "resource",
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "default": [],
+          "markdownDescription": "The list of extra file extensions to be considered as LaTeX files. The extension will parse these files for references and to provide intellisense."
+        },
         "latex-workshop.latex.jobname": {
           "scope": "resource",
           "type": "string",

src/core/file.ts

@@ -98,6 +98,7 @@ function handleTmpDirError(error: Error) {
 function hasTeXExt(extname: string): boolean {
     return [
         ...lw.constant.TEX_EXT,
+        ...lw.constant.EXTRA_TEX_EXT,
         ...lw.constant.RSWEAVE_EXT,
         ...lw.constant.JLWEAVE_EXT,
         ...lw.constant.PWEAVE_EXT
@@ -123,6 +124,7 @@ function hasTeXExt(extname: string): boolean {
 function hasBinaryExt(extname: string): boolean {
     return ![
         ...lw.constant.TEX_EXT,
+        ...lw.constant.EXTRA_TEX_EXT,
         ...lw.constant.TEX_NOCACHE_EXT,
         ...lw.constant.RSWEAVE_EXT,
         ...lw.constant.JLWEAVE_EXT,

src/lw.ts

@@ -60,6 +60,7 @@ export const lw = {
 
 const constant = {
     TEX_EXT: ['.tex', '.bib'],
+    EXTRA_TEX_EXT: vscode.workspace.getConfiguration('latex-workshop').get('latex.extraExts', []) as string[],
     TEX_NOCACHE_EXT: ['.cls', '.sty', '.bst', '.bbx', '.cbx', '.def', '.cfg'],
     RSWEAVE_EXT: ['.rnw', '.Rnw', '.rtex', '.Rtex', '.snw', '.Snw'],
     JLWEAVE_EXT: ['.jnw', '.jtexw'],
@@ -69,7 +70,7 @@ const constant = {
     MAGIC_PROGRAM_ARGS_SUFFIX: '_WITH_ARGS',
     MAX_PRINT_LINE: '10000',
     /**
-     * Prefix that server.ts uses to distiguish requests on pdf files from
+     * Prefix that server.ts uses to distinguish requests on pdf files from
      * others. We use '.' because it is not converted by encodeURIComponent and
      * other functions.
      * See https://stackoverflow.com/questions/695438/safe-characters-for-friendly-url