From 9eca2a68df8afb078aebda3dfcb3fa6c1b45a5af Mon Sep 17 00:00:00 2001
From: Dmitry <b4tm4n@mail.ru>
Date: Thu, 25 Aug 2022 16:12:47 +0300
Subject: [PATCH] impl FromStr for KeywordType

---
 src/main.rs | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index fd6a404..65cb3a9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,7 @@ use encoding::all::KOI8_R;
 use encoding::DecoderTrap;
 use rayon::prelude::*;
 use std::path::PathBuf;
+use std::str::FromStr;
 use std::{fs, io};
 use textstream::TextReader;
 
@@ -90,10 +91,12 @@ impl Context {
     }
 }
 
-impl KeywordType {
-    fn from(pattern: &str) -> KeywordType {
+impl FromStr for KeywordType {
+    type Err = ();
+
+    fn from_str(pattern: &str) -> Result<Self, Self::Err> {
         use KeywordType::*;
-        match pattern {
+        Ok(match pattern {
             "Мета:" => Ignore,
             "Чемпионат:" | "Пакет:" => Global,
             "Тур:" => QuestionPre,
@@ -102,7 +105,7 @@ impl KeywordType {
             _ => CurrentScope,
             // "URL:" | "Ссылка:" | "Дата:" | "Обработан:" | "Автор:" | "Редактор:" | "Копирайт:" | "Инфо:" |
             // "Тема:" | "Вид:" | "Тип:" | "Источник:" | "Рейтинг:" | "Комментарий:" | "Комментарии:"
-        }
+        })
     }
 }
 
@@ -152,7 +155,7 @@ fn parse_file(file: impl io::Read) -> Result<json::JsonValue, Box<dyn std::error
 
                     ctx.last_keyword_type = ctx.cur_keyword_type;
                     ctx.last_tag = ctx.cur_tag.clone();
-                    ctx.cur_keyword_type = Some(KeywordType::from(pattern));
+                    ctx.cur_keyword_type = Some(pattern.parse().unwrap());
                     ctx.cur_tag = pattern.replace(' ', "").replace(':', "");
 
                     // remember question id