Add way to show how to input a given character

[Blaisorblade]

Use case: I'm using some Unicode API and want to know how to type the Unicode symbol they're using.

The best way, right now, is to copy the symbol and search it through https://github.com/ojsheikh/unicode-latex/blob/master/src/latex.ts. It'd be convenient to automate that.

[holm-xie]

I add a command showLatexCode in a naive way to insert the code just behind the selection(if it is a valid LaTex name in the latex.ts). but it works for me, here is the patch, hope it helps:

diff -ur ./package.json "..\\unicode-latex-master2020-01-17_1445\\unicode-latex-master/package.json"
--- ./package.json	2020-01-17 17:53:53.815184600 +0800
+++ "..\\unicode-latex-master2020-01-17_1445\\unicode-latex-master/package.json"	2019-06-23 05:44:28.000000000 +0800
@@ -17,7 +17,6 @@
   "activationEvents": [
     "onCommand:unicode-latex.insertMathSymbol",
     "onCommand:unicode-latex.replaceLatexNames",
-    "onCommand:unicode-latex.showLatexCode",
     "onLanguage:plaintext"
   ],
   "main": "./out/src/extension",
@@ -30,10 +29,6 @@
       {
         "command": "unicode-latex.replaceLatexNames",
         "title": "Unicode: Replace LaTeX"
-      },
-      {
-        "command": "unicode-latex.showLatexCode",
-        "title": "Unicode: Show LaTex Code"
       }
     ]
   },
diff -ur ./src/extension.ts "..\\unicode-latex-master2020-01-17_1445\\unicode-latex-master/src/extension.ts"
--- ./src/extension.ts	2020-01-17 17:37:23.673565300 +0800
+++ "..\\unicode-latex-master2020-01-17_1445\\unicode-latex-master/src/extension.ts"	2019-06-23 05:44:28.000000000 +0800
@@ -8,7 +8,6 @@
 let pickOptions: vscode.QuickPickOptions = {
     matchOnDescription: true,
 };
-var latexSymbols2: { [name:string]: string} = {};
 
 export function activate(context: vscode.ExtensionContext) {
 
@@ -18,7 +17,6 @@
             description: name,
             label: latexSymbols[name],
         });
-        latexSymbols2[latexSymbols[name]] = name;
     }
 
     let insertion = vscode.commands.registerCommand('unicode-latex.insertMathSymbol', () => {
@@ -27,9 +25,6 @@
     let replacement = vscode.commands.registerCommand('unicode-latex.replaceLatexNames', () => {
         replaceWithUnicode(vscode.window.activeTextEditor);
     });
-    let showLatex = vscode.commands.registerCommand('unicode-latex.showLatexCode', () => {
-        appendLatexOfUnicode(vscode.window.activeTextEditor);
-    });
 
     const selector: vscode.DocumentSelector = ['plaintext', 'markdown', 'coq'];
     const provider = new LatexCompletionItemProvider(latexSymbols);
@@ -37,7 +32,6 @@
 
     context.subscriptions.push(insertion);
     context.subscriptions.push(replacement);
-    context.subscriptions.push(showLatex);
     context.subscriptions.push(completionSub);
 }
 
@@ -84,24 +78,5 @@
     });
 }
 
-function appendLatexOfUnicode(editor: vscode.TextEditor) {
-    if (!editor) { return; }
-
-    // If nothing is selected, do nothing
-    let selection = (() => {
-        if (editor.selection.start.isBefore(editor.selection.end)) {
-            return editor.selection;
-        } else {
-            return;
-        }
-    })();
-
-    let text = editor.document.getText(selection);
-    if (latexSymbols2.hasOwnProperty(text)){
-        editor.edit((editBuilder) => {
-            editBuilder.insert(editor.selection.end, latexSymbols2[text]);
-        });
-    }
-}
 // this method is called when your extension is deactivated
 export function deactivate() {}

[Blaisorblade]

@holm-xie Thanks! Can you please format that as code (add a line with three backticks before and one after)? It's hard to read otherwise...

[holm-xie]

Please check it out again, I did not aware the markdown render make the patch mess in my previous post.
Since the patch is made in a reverse order, it should be applied like patch -R -p 1 < showLatexCode.patch if you use patch command to merge it to your copy of code.

[Blaisorblade]

Thanks @holm-xie! That works, I've opened a PR, with appropriate credit: I've not tagged you in the commit because that's annoying (it sends notifications at each rebase), but I can if you want.

As far as I can see, one must select the character, run the vscode command, and the latex command appears in the editor.

[holm-xie]

@Blaisorblade, a PR is fine, please.
You're right, the selected character is for looking-up. If needed, without the hint of selection, we can also check the character around the cursor or even more. But I think the existing implemention is enough for my requirement.

[holm-xie]

@Blaisorblade, a PR is fine, please.
BTW, change the line
editBuilder.insert(editor.selection.end, latexSymbols2[text]);
as following will make the command output more sensible:

     editBuilder.insert(editor.selection.end, "("+latexSymbols2[text]+")");
     let.wordRange = editor.document.getWordRangeAtPosition(editor.selection.start);
     editor.document.getText(wordRange);