Cromo for Visual Studio Code
Support for Cromo, a general-purpose language with the syntax of C and C++, ownership without a garbage collector, lightweight tasks, and one tool that compiles and links.
Features
- Syntax highlighting of the
.cro files: keywords, types, numbers, strings with their format placeholders ({}, {:.2f}), comments, attributes and functions.
- Errors as you type, from the compiler itself.
- Hover: the type of a value or the signature of a function under the mouse.
- Go to Definition (F12) and the outline of the file.
- Completion of the fields and the methods after a dot.
- Formatting with the rules of
cromo fmt, also when a file is saved.
- Comment toggling (
Ctrl+/), closing brackets and indentation after {.
Requirements
Everything but the colors comes from the language server of the compiler, cromo lsp, so the extension needs cromo. It is one command:
irm https://cromolang.org/install.ps1 | iex # Windows, in PowerShell
curl -sSf https://cromolang.org/install.sh | sh # Linux
The installers also install this extension, when the command code is there.
Settings
| Setting |
Meaning |
cromo.path |
The cromo executable that runs the language server. Empty: build\cromo.exe in a folder of the workspace, as while working on Cromo itself, else cromo from PATH. |
cromo.trace |
Writes every message between VS Code and cromo lsp in the Cromo output panel. |
Files of Cromo are formatted when they are saved (editor.formatOnSave); turn it off for [cromo] in the settings, if you prefer.
If cromo cannot start, a message says so. On Windows the server runs from a copy of cromo.exe in the temporary folder, so that cromo.exe can be built again while VS Code is open; when it changes, the server starts again.
Learn more
- The Cromo Guide, in English and in Italian, also as a PDF.
- The sources of the language, of this extension and the issues are on GitHub.
Building the extension
From the folder of the repository, in PowerShell:
powershell -ExecutionPolicy Bypass -File tools\vscode-cromo\build-vsix.ps1 -Install
The script writes tools/vscode-cromo/dist/cromo-<version>.vsix, without npm, and with -Install installs it with code --install-extension. The grammar is in syntaxes/cromo.tmLanguage.json: when the keywords or the built-in types change, update it and raise version in package.json.
