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# Reference: command line
> Neutral description of the `turbo-golo` command, its flags, and the environment it reads.
## Synopsis
```
turbo-golo [flags] [file...]
```
Each `file` is opened in its own window. A file that does not exist yet is opened as an empty buffer bound to that path. With no file at all, one empty untitled window is opened.
## Flags
| Flag | Type | Default | Description |
| --- | --- | --- | --- |
| `-theme <name>` | string | the project's, else `turbo-classic` | Theme to start with, overriding the project's own. An unknown name falls back to the default without an error. |
| `-list-themes` | bool | `false` | Print every loadable theme with its description, then the user theme directory, and exit. |
| `-no-lsp` | bool | `false` | Do not start a language server. Colouring and editing are unaffected. |
| `-version` | bool | `false` | Print `Turbo Golo <version>` on one line, with the commit and build date when the build recorded them, and exit. See [the version number](versioning.md). |
| `-h`, `-help` | bool | `false` | Print the flag list and exit. |
## Environment
| Variable | Read by | Effect |
| --- | --- | --- |
| `TURBO_GOLO_DIR` | user files | Directory to keep the user's own files in — themes and snippets — instead of `~/.config/turbo-golo`. |
| `TURBO_GOLO_THEME_DIR` | theme loading | Directory to read user themes from, instead of `<user dir>/themes`. |
| `TURBO_GOLO_SNIPPET_DIR` | snippets | Directory to read the user's `snippets.toml` from, instead of `<user dir>`. |
| `TERM` | tcell | Which terminal description to use. |
| `PATH` | `golo` lookup | Searched first for `golo`; `/usr/local/bin` is tried after it. No other variable names a directory to look in. |
## Files
| Path | Purpose |
| --- | --- |
| `$TURBO_GOLO_THEME_DIR/*.toml` | User themes, when the variable is set. |
| `./.turbo-golo/settings.toml` | This project's settings, read at start-up and again when saved from the editor. See [project settings](project-settings.md). |
| `./.turbo-golo/snippets.toml` | This project's snippets, read each time the Snippets menu opens. See [snippets](snippets.md). |
| `./.turbo-golo/tools.toml` | This project's tools, read each time the Golo menu opens. See [Golo tools](golo-tools.md). |
| `~/.config/turbo-golo/themes/*.toml` | User themes on Linux (`os.UserConfigDir`). |
| `~/.config/turbo-golo/snippets.toml` | User snippets on Linux. |
| `~/Library/Application Support/turbo-golo/…` | The same two on macOS. |
There is no project marker file. The language server is started in the directory of the first file named on the command line, or in the working directory when none is; no parent directory is looked at.
## Exit status
| Status | Meaning |
| --- | --- |
| `0` | The editor exited normally, or an informational flag was used. |
| `1` | The terminal could not be opened or initialised. The reason is printed to standard error. |
## Make targets
Run from a checkout.
| Target | What it runs |
| --- | --- |
| `make help` | List the targets. This is the default. |
| `make test` | `go test ./...` |
| `make test-verbose` | `go test -v ./...` |
| `make cover` | `go test -cover ./...` |
| `make build` | `go build -ldflags "…" -o bin/turbo-golo .`, stamping the version, then `scripts/check-version.sh` on the result |
| `make version` | Print the version this checkout would stamp, without building |
| `make ldflags` | Print the linker flags a stamped build uses |
| `make install` | `scripts/install.sh` — build and install onto your PATH |
| `make uninstall` | `scripts/install.sh --uninstall` |
| `make run FILE=x.golo` | `make build`, then `./bin/turbo-golo x.golo` |
| `make fmt` | `go fmt ./...` |
| `make vet` | `go vet ./...` |
| `make check` | `fmt`, then `vet`, then `test` |
| `make clean` | Remove `bin/` |
## Examples
```bash
turbo-golo # one empty window
turbo-golo main.golo main_test.golo # two windows
turbo-golo -theme turbo-dark main.golo # a different theme
turbo-golo -no-lsp main.golo # no language server
turbo-golo -list-themes # what themes exist
```
## Installer
`scripts/install.sh`, also reachable as `make install`.
| Option | Description |
| --- | --- |
| `-p`, `--prefix DIR` | Install into `DIR` instead of `$GOBIN` or `$GOPATH/bin`. |
| `--with-server` | Also build and install GoloScript — `golo`, `gogolo` and `wagolo` — from source into `/usr/local/bin`, if `golo` is not already there. Needs `git` and Go. |
| `--uninstall` | Remove an installed `turbo-golo` and stop. |
| `-h`, `--help` | Print the options and stop. |
| Exit status | Meaning |
| --- | --- |
| `0` | Installed, removed, or help printed. |
| `1` | Go missing or too old, the build failed, the built binary did not report its version, or the destination could not be written. Nothing is installed and an existing installation is left untouched. |
## Errors
| Message | Cause |
| --- | --- |
| `turbo-golo: opening the terminal: …` | tcell could not open the terminal; usually `TERM` is unset or unknown. |
| `turbo-golo: initialising the terminal: …` | The terminal was opened but could not be put into raw mode. |
| `turbo-golo: reading …/settings.toml: …` | The project's settings file is not valid; the editor opens with its defaults. |
| `Cannot open` (in a dialog) | The path is a directory, or is not readable. |
| `Cannot save` (in a dialog) | The directory does not exist, or is not writable. |
|