Add configurable stopwords feature

CONFIGURATION.md

@@ -25,6 +25,10 @@ Sonic Configuration
 * `list_limit_default` (type: _integer_, allowed: numbers, default: `100`) — Default listed words limit for a list command (if the LIMIT command modifier is not used when issuing a LIST command)
 * `list_limit_maximum` (type: _integer_, allowed: numbers, default: `500`) — Maximum listed words limit for a list command (if the LIMIT command modifier is being used when issuing a LIST command)
 
+**[channel.search.stopwords]**
+
+* `${language_code}` (type: _string[]_, allowed: [supported language codes](https://github.com/valeriansaliou/sonic/tree/master/src/stopwords), default: none) — User defined stopwords for the selected language. Use it only if you want to override the preset of Sonic. Setting this value explicitly to `[]` disables stopwords at all.
+
 **[store]**
 
 **[store.kv]**

config.cfg

@@ -28,6 +28,7 @@ suggest_limit_maximum = 20
 list_limit_default = 100
 list_limit_maximum = 500
 
+[channel.search.stopwords]
 
 [store]
 

src/config/defaults.rs

@@ -4,6 +4,7 @@
 // Copyright: 2019, Valerian Saliou <[email protected]>
 // License: Mozilla Public License v2.0 (MPL v2.0)
 
+use super::options::ConfigChannelSearchStopwords;
 use std::net::SocketAddr;
 use std::path::PathBuf;
 
@@ -47,6 +48,10 @@ pub fn channel_search_list_limit_maximum() -> u16 {
     500
 }
 
+pub fn channel_search_stopwords() -> ConfigChannelSearchStopwords {
+    ConfigChannelSearchStopwords::default()
+}
+
 pub fn store_kv_path() -> PathBuf {
     PathBuf::from("./data/store/kv/")
 }

src/config/options.rs

@@ -65,6 +65,88 @@ pub struct ConfigChannelSearch {
 
     #[serde(default = "defaults::channel_search_list_limit_maximum")]
     pub list_limit_maximum: u16,
+
+    #[serde(default = "defaults::channel_search_stopwords")]
+    pub stopwords: ConfigChannelSearchStopwords,
+}
+
+#[derive(Deserialize, Default)]
+pub struct ConfigChannelSearchStopwords {
+    pub epo: Option<Vec<String>>,
+    pub eng: Option<Vec<String>>,
+    pub rus: Option<Vec<String>>,
+    pub cmn: Option<Vec<String>>,
+    pub spa: Option<Vec<String>>,
+    pub por: Option<Vec<String>>,
+    pub ita: Option<Vec<String>>,
+    pub ben: Option<Vec<String>>,
+    pub fra: Option<Vec<String>>,
+    pub deu: Option<Vec<String>>,
+
+    pub ukr: Option<Vec<String>>,
+    pub kat: Option<Vec<String>>,
+    pub ara: Option<Vec<String>>,
+    pub hin: Option<Vec<String>>,
+    pub jpn: Option<Vec<String>>,
+    pub heb: Option<Vec<String>>,
+    pub yid: Option<Vec<String>>,
+    pub pol: Option<Vec<String>>,
+    pub amh: Option<Vec<String>>,
+    pub jav: Option<Vec<String>>,
+
+    pub kor: Option<Vec<String>>,
+    pub nob: Option<Vec<String>>,
+    pub dan: Option<Vec<String>>,
+    pub swe: Option<Vec<String>>,
+    pub fin: Option<Vec<String>>,
+    pub tur: Option<Vec<String>>,
+    pub nld: Option<Vec<String>>,
+    pub hun: Option<Vec<String>>,
+    pub ces: Option<Vec<String>>,
+    pub ell: Option<Vec<String>>,
+
+    pub bul: Option<Vec<String>>,
+    pub bel: Option<Vec<String>>,
+    pub mar: Option<Vec<String>>,
+    pub kan: Option<Vec<String>>,
+    pub ron: Option<Vec<String>>,
+    pub slv: Option<Vec<String>>,
+    pub hrv: Option<Vec<String>>,
+    pub srp: Option<Vec<String>>,
+    pub mkd: Option<Vec<String>>,
+    pub lit: Option<Vec<String>>,
+
+    pub lav: Option<Vec<String>>,
+    pub est: Option<Vec<String>>,
+    pub tam: Option<Vec<String>>,
+    pub vie: Option<Vec<String>>,
+    pub urd: Option<Vec<String>>,
+    pub tha: Option<Vec<String>>,
+    pub guj: Option<Vec<String>>,
+    pub uzb: Option<Vec<String>>,
+    pub pan: Option<Vec<String>>,
+    pub aze: Option<Vec<String>>,
+
+    pub ind: Option<Vec<String>>,
+    pub tel: Option<Vec<String>>,
+    pub pes: Option<Vec<String>>,
+    pub mal: Option<Vec<String>>,
+    pub ori: Option<Vec<String>>,
+    pub mya: Option<Vec<String>>,
+    pub nep: Option<Vec<String>>,
+    pub sin: Option<Vec<String>>,
+    pub khm: Option<Vec<String>>,
+    pub tuk: Option<Vec<String>>,
+
+    pub aka: Option<Vec<String>>,
+    pub zul: Option<Vec<String>>,
+    pub sna: Option<Vec<String>>,
+    pub afr: Option<Vec<String>>,
+    pub lat: Option<Vec<String>>,
+    pub slk: Option<Vec<String>>,
+    pub cat: Option<Vec<String>>,
+    pub tgl: Option<Vec<String>>,
+    pub hye: Option<Vec<String>>,
 }
 
 #[derive(Deserialize)]