Helix editor live preview not working?

[burumdev]

I try to start live-preview from helix editor, but nothing happens. I select the code action "Show Preview" when the cursor is on the MainWindow component name and press enter. I've not edited any slint-lsp specific configuration for helix editor. The specs are:

Slint: 1.9.1
Helix: 24.7
Platform: Debian 12

slint-helix-2025-01-05_13.50.32.webm

[hunger]

That works fine for me. My guess would be that you are missing one of the dependencies. Can you please run ldd /path/to/slint-lsp and check?

That should actually fail earlier... Can you also check the LS logs in helix? :log-open in helix should open that for you.

[tronical]

Since the lsp itself is running and the preview showing triggers this, then it could be related to a missing library dependencies that's dynamically opened with dlopen when establishing a connection to the windowing system. Is there any way to see output from the slint-lsp process as helix starts it? Is helix running in some sandbox of sorts?

[burumdev]

ldd slint-lsp output:

        linux-vdso.so.1 (0x00007ffc80bce000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f1b46600000)
        libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007f1b46000000)
        libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007f1b45800000)
        libQt5Widgets.so.5 => /lib/x86_64-linux-gnu/libQt5Widgets.so.5 (0x00007f1b45000000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f1b4858d000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f1b484ac000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1b4681f000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f1b485d2000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f1b4848d000)
        libdouble-conversion.so.3 => /lib/x86_64-linux-gnu/libdouble-conversion.so.3 (0x00007f1b48478000)
        libicui18n.so.72 => /lib/x86_64-linux-gnu/libicui18n.so.72 (0x00007f1b44c00000)
        libicuuc.so.72 => /lib/x86_64-linux-gnu/libicuuc.so.72 (0x00007f1b44a02000)
        libpcre2-16.so.0 => /lib/x86_64-linux-gnu/libpcre2-16.so.0 (0x00007f1b46572000)
        libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007f1b45f44000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f1b456c8000)
        libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f1b44f79000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f1b48440000)
        libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007f1b448fe000)
        libmd4c.so.0 => /lib/x86_64-linux-gnu/libmd4c.so.0 (0x00007f1b4842c000)
        libicudata.so.72 => /lib/x86_64-linux-gnu/libicudata.so.72 (0x00007f1b42a00000)
        libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f1b44864000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f1b42947000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f1b45f10000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f1b4287d000)
        libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007f1b45ee4000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f1b4273b000)
        libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x00007f1b46565000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f1b44f4f000)
        libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x00007f1b44f2c000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f1b4681a000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f1b42400000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f1b456b2000)
        libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007f1b46558000)

helix log entry:

2025-01-06T16:41:43.008 helix_lsp::transport [ERROR] slint-lsp err: <- StreamClosed
2025-01-06T16:41:55.179 helix_lsp::transport [ERROR] slint-lsp <- MethodNotFound: Cannot handle request
2025-01-06T16:41:55.179 helix_lsp::transport [ERROR] Discarding Language Server response without a request (id=Num(29)) Err(Rpc(Error { code: MethodNotFound, message: "Cannot handle request", data: None }))
2025-01-06T16:42:01.446 helix_lsp::client [WARN] language server failed to terminate gracefully - server closed the stream
2025-01-06T16:42:01.446 helix_lsp::transport [ERROR] slint-lsp err: <- StreamClosed
2025-01-06T16:42:01.446 helix_lsp::transport [ERROR] slint-lsp err: <- IO(Os { code: 32, kind: BrokenPipe, message: "Broken pipe" })
2025-01-06T16:42:03.300 helix_lsp::transport [ERROR] err: <- Other(failed to send a message to server

Does that look like it?

Also I can run slint-viewer from the command line. Maybe not the same thing as live preview, but does the job for me for now. Thanks.

[hunger]

I messed up the error reporting on PlatformErrors in 1.9.0, it might just be dropping the interesting info:-( That will be fixed in 1.9.2 which should be out soon.

Sorry for that.