ddc-source-vim-lsp/denops/@ddc-sources/vim-lsp.ts

import {
  BaseSource,
  Candidate,
} from "https://deno.land/x/ddc_vim@v0.13.0/types.ts#^";

import {
  batch,
  Denops,
  vars,
} from "https://deno.land/x/ddc_vim@v0.13.0/deps.ts#^";

type Params = {};

export class Source extends BaseSource {
  async onInit(args: {
    denops: Denops;
  }): Promise<void> {
    await batch(args.denops, async (denops) => {
      await vars.g.set(denops, "ddc#source#ddc_vim_lsp#_results", []);
      await vars.g.set(denops, "ddc#source#ddc_vim_lsp#_requested", false);
      await vars.g.set(denops, "ddc#source#ddc_vim_lsp#_prev_input", "");
    });
  }

  async gatherCandidates(args: {
    denops: Denops;
    context: Context;
    completeStr: string;
  }): Promise<Candidate[]> {
    const prevInput = await vars.g.get(
      args.denops,
      "ddc#source#ddc_vim_lsp#_prev_input",
    );
    const requested = await vars.g.get(
      args.denops,
      "ddc#source#ddc_vim_lsp#_requested",
    );
    if (args.context.input == prevInput && requested) {
      return await vars.g.get(args.denops, "ddc#source#ddc_vim_lsp#_results");
    }

    const lspservers = await args.denops.call("lsp#get_allowed_servers");
    if (lspservers.length === 0) {
      return [];
    }

    await batch(args.denops, async (denops) => {
      await vars.g.set(denops, "ddc#source#ddc_vim_lsp#_results", []);
      await vars.g.set(denops, "ddc#source#ddc_vim_lsp#_requested", false);
      await vars.g.set(
        denops,
        "ddc#source#ddc_vim_lsp#_prev_input",
        args.context.input,
      );

      // NOTE: choose first lsp server
      await denops.call("ddc_vim_lsp#request", lspservers[0]);
    });

    return [];
  }

  params(): Params {
    return {};
  }
}