Add/Show/Delete Emojis on Notes (#181)

This MR adds the ability to view, add, and delete emojis from notes and comments.

This action can be performed by default with the `Ea` (emoji add) keybinding, and the `Ed` (emoji delete) keybinding. Only emojis added by the current user are eligible for deletion. The MR also implements a popup functionality which shows the user who added emojis on hover.

Implements #179

cmd/user.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/xanzy/go-gitlab"
+)
+
+type UserResponse struct {
+	SuccessResponse
+	User *gitlab.User `json:"user"`
+}
+
+func (a *api) meHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	if r.Method != http.MethodGet {
+		w.Header().Set("Access-Control-Allow-Methods", http.MethodGet)
+		handleError(w, InvalidRequestError{}, "Expected GET", http.StatusMethodNotAllowed)
+		return
+	}
+
+	user, res, err := a.client.CurrentUser()
+
+	if err != nil {
+		handleError(w, err, "Failed to get current user", http.StatusInternalServerError)
+		return
+	}
+
+	if res.StatusCode >= 300 {
+		handleError(w, err, "User API returned non-200 status", res.StatusCode)
+		return
+	}
+
+	response := UserResponse{
+		SuccessResponse: SuccessResponse{
+			Message: "User fetched successfully",
+			Status:  http.StatusOK,
+		},
+		User: user,
+	}
+
+	err = json.NewEncoder(w).Encode(response)
+	if err != nil {
+		handleError(w, err, "Could not encode response", http.StatusInternalServerError)
+	}
+}