Get config value for status line

[augustocdias]

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Description

Is there a way to get the current target configured so I can display it in the status line? I'm using the command RustAnalyzer target to change the triple to build against depending on what I'm working and it would be useful to quickly show what's the current triple somewhere.

Neovim version (nvim -v)

NVIM v0.12.0-dev-820+g7bf04bc01f
Build type: RelWithDebInfo
LuaJIT 2.1.1744317938
Run "nvim -V1 -v" for more info

Operating system/version

MacOs 15.5

[mrcjkb]

Hey 👋

rustaceanvim doesn't store that information. But you could probably use vim.lsp.get_clients to find the rust-analyzer LSP client. The returned table should include the client config, which includes the cargo.target.

[augustocdias]

in case someone want's to do the same here's the snippet:

I have a utils.lua

return {
    find_table_value = function(tbl, keys)
        local current = tbl
        for _, key in ipairs(keys) do
            if type(current) == 'table' and current[key] ~= nil then
                current = current[key]
            else
                return nil
            end
        end
        return current
    end,
    describe_host = function(target)
        local mappings = {
            ['x86_64-apple-darwin'] = 'Mac (Intel)',
            ['aarch64-apple-darwin'] = 'Mac (Apple Silicon)',
            ['x86_64-unknown-linux-gnu'] = 'Linux (x86_64)',
            ['aarch64-unknown-linux-gnu'] = 'Linux (ARM64)',
            ['x86_64-pc-windows-msvc'] = 'Windows (x86_64)',
            ['i686-pc-windows-msvc'] = 'Windows (32-bit)',
            ['x86_64-pc-windows-gnu'] = 'Windows (x86_64)',
            ['i686-pc-windows-gnu'] = 'Windows (32-bit)',
        }

        return mappings[target] or ('Unknown Host (' .. target .. ')')
    end,
    get_host_target = function()
        local cmd = "cargo -vV | grep 'host' | cut -d' ' -f2"
        local host = vim.fn.system(cmd):gsub('%s+', '') -- remove trailing newline/whitespace

        if vim.v.shell_error ~= 0 or host == '' then
            return nil, 'Failed to get cargo host'
        end

        return host
    end,
}

then in lualine I add a section:

                    function()
                        local host_rust_target = utils.get_host_target()
                        local rust_analyzer = vim.lsp.get_clients({ name = 'rust-analyzer' })[1]
                        if rust_analyzer then
                            local target = utils.find_table_value(
                                rust_analyzer,
                                { 'settings', 'rust-analyzer', 'cargo', 'target' }
                            ) or host_rust_target
                            return utils.describe_host(target)
                        end
                        return ''
                    end,

[mrcjkb]

You can probably replace find_table_value vim.tbl_get.
And for performance I'd recommend you evaluate utils.get_host_target() lazily (after the or), as it shells out to cargo, blocking the UI.

[augustocdias]

Thanks for the tip with the tbl_get

And for performance I'd recommend you evaluate utils.get_host_target() lazily (after the or), as it shells out to cargo, blocking the UI.

Yes. I'm doing it outside of the statusline function. It executes just once.