Gemini provider

[deathbeam]

You need to set GEMINI_API_KEY to your API key.

{
    gemini = {
        prepare_input = require('CopilotChat.config.providers').copilot.prepare_input,
        prepare_output = require('CopilotChat.config.providers').copilot.prepare_output,

        get_headers = function()
            local api_key = assert(os.getenv('GEMINI_API_KEY'), 'GEMINI_API_KEY env not set')
            return {
                Authorization = 'Bearer ' .. api_key,
                ['Content-Type'] = 'application/json',
            }
        end,

        get_models = function(headers)
            local response, err = require('CopilotChat.utils').curl_get('https://generativelanguage.googleapis.com/v1beta/openai/models', {
                headers = headers,
                json_response = true,
            })

            if err then
                error(err)
            end

            return vim.tbl_map(function(model)
                local id = model.id:gsub('^models/', '')
                return {
                    id = id,
                    name = id,
                }
            end, response.body.data)
        end,

        embed = function(inputs, headers)
            local response, err = require('CopilotChat.utils').curl_post('https://generativelanguage.googleapis.com/v1beta/openai/embeddings', {
                headers = headers,
                json_request = true,
                json_response = true,
                body = {
                    input = inputs,
                    model = 'text-embedding-004',
                },
            })

            if err then
                error(err)
            end

            return response.body.data
        end,

        get_url = function()
            return 'https://generativelanguage.googleapis.com/v1beta/openai/chat/completions'
        end,
    }
}