Merge pull request #65 from Kerollmops/logging

Add a little bit of logging

Cargo.toml

@@ -13,6 +13,7 @@ hashbrown = { version = "0.1", features = ["serde"] }
 lazy_static = "1.1"
 levenshtein_automata = { version = "0.1", features = ["fst_automaton"] }
 linked-hash-map = { version = "0.5", features = ["serde_impl"] }
+log = "0.4"
 sdset = "0.3"
 serde = "1.0"
 serde_derive = "1.0"
@@ -41,6 +42,7 @@ nightly = ["hashbrown/nightly", "group-by/nightly"]
 [dev-dependencies]
 csv = "1.0"
 elapsed = "0.1"
+env_logger = "0.6"
 jemallocator = "0.1"
 quickcheck = "0.7"
 rand = "0.6"

examples/create-database.rs

@@ -66,6 +66,7 @@ fn index(schema: Schema, database_path: &Path, csv_data_path: &Path) -> Result<D
 }
 
 fn main() -> Result<(), Box<Error>> {
+    let _ = env_logger::init();
     let opt = Opt::from_args();
 
     let schema = {

examples/query-database.rs

@@ -76,6 +76,7 @@ fn create_highlight_areas(text: &str, matches: &[Match], attribute: SchemaAttr)
 }
 
 fn main() -> Result<(), Box<Error>> {
+    let _ = env_logger::init();
     let opt = Opt::from_args();
 
     let (elapsed, result) = elapsed::measure_time(|| Database::open(&opt.database_path));
@@ -136,7 +137,7 @@ fn main() -> Result<(), Box<Error>> {
             println!();
         }
 
-        println!("===== Found {} results in {} =====", number_of_documents, elapsed);
+        eprintln!("===== Found {} results in {} =====", number_of_documents, elapsed);
         buffer.clear();
     }
 

src/rank/query_builder.rs

@@ -8,6 +8,7 @@ use group_by::GroupByMut;
 use hashbrown::HashMap;
 use fst::Streamer;
 use rocksdb::DB;
+use log::info;
 
 use crate::automaton::{self, DfaExt, AutomatonExt};
 use crate::rank::distinct_map::{DistinctMap, BufferedDistinctMap};
@@ -116,6 +117,8 @@ where D: Deref<Target=DB>,
             }
         }
 
+        info!("{} documents to classify", matches.len());
+
         matches.into_iter().map(|(i, m)| Document::from_unsorted_matches(i, m)).collect()
     }
 }