chore: Make the repo use examples and keep the library

examples/json-lines-indexer.rs

@@ -0,0 +1,153 @@
+#[macro_use] extern crate serde_derive;
+
+use std::collections::BTreeMap;
+use std::io::{self, BufReader, BufRead};
+use std::fs::File;
+use std::path::PathBuf;
+
+use serde_json::from_str;
+use rocksdb::{SstFileWriter, EnvOptions, ColumnFamilyOptions};
+use raptor::{MetadataBuilder, DocIndex, Tokenizer, CommonWords};
+use structopt::StructOpt;
+
+#[derive(Debug, StructOpt)]
+pub struct CommandJsonLines {
+    /// The stop word file, each word must be separated by a newline.
+    #[structopt(long = "stop-words", parse(from_os_str))]
+    pub stop_words: PathBuf,
+
+    /// The csv file to index.
+    #[structopt(parse(from_os_str))]
+    pub products: PathBuf,
+}
+
+#[derive(Debug, Deserialize)]
+struct Product {
+    id: u64,
+    title: String,
+    description: String,
+    image: String,
+}
+
+#[derive(Debug)]
+pub struct JsonLinesIndexer {
+    common_words: CommonWords,
+    products: PathBuf,
+}
+
+impl JsonLinesIndexer {
+    pub fn from_command(command: CommandJsonLines) -> io::Result<JsonLinesIndexer> {
+        let common_words = CommonWords::from_file(command.stop_words)?;
+        let products = command.products;
+
+        Ok(JsonLinesIndexer { common_words, products })
+    }
+
+    pub fn index(self) {
+        let data = File::open(&self.products).unwrap();
+        let data = BufReader::new(data);
+
+        // TODO add a subcommand to pack these files in a tar.xxx archive
+        let random_name = PathBuf::from(moby_name_gen::random_name());
+        let map_file = random_name.with_extension("map");
+        let idx_file = random_name.with_extension("idx");
+        let sst_file = random_name.with_extension("sst");
+
+        let env_options = EnvOptions::new();
+        let cf_options = ColumnFamilyOptions::new();
+        let mut sst_file_writer = SstFileWriter::new(env_options, cf_options);
+        let sst_file = sst_file.to_str().unwrap();
+        sst_file_writer.open(&sst_file).expect("open the sst file");
+
+        let map = File::create(&map_file).unwrap();
+        let indexes = File::create(&idx_file).unwrap();
+        let mut builder = MetadataBuilder::new(map, indexes);
+        let mut fields = BTreeMap::new();
+        let mut errors = 0;
+
+        for result in data.lines() {
+            let product: Product = match result {
+                Ok(product) => match from_str(&product) {
+                    Ok(product) => product,
+                    Err(e) => { eprintln!("{:?}", e); errors += 1; continue },
+                },
+                Err(e) => { eprintln!("{:?}", e); errors += 1; continue },
+            };
+
+            {
+                let string_id = product.id.to_string();
+                insert_document_words(&mut builder, product.id, 0, Some((0, string_id.as_str())));
+
+                let key = format!("{}-id", product.id);
+                let value = string_id;
+                fields.insert(key, value);
+            }
+
+            {
+                let title = Tokenizer::new(&product.title);
+                let title = title.iter().filter(|&(_, w)| !self.common_words.contains(w));
+                insert_document_words(&mut builder, product.id, 1, title);
+
+                let key = format!("{}-title", product.id);
+                let value = product.title;
+                fields.insert(key, value);
+            }
+
+            {
+                let description = Tokenizer::new(&product.description);
+                let description = description.iter().filter(|&(_, w)| !self.common_words.contains(w));
+                insert_document_words(&mut builder, product.id, 2, description);
+
+                let key = format!("{}-description", product.id);
+                let value = product.description;
+                fields.insert(key, value);
+            }
+
+            {
+                let key = format!("{}-image", product.id);
+                let value = product.image;
+                fields.insert(key, value);
+            }
+        }
+
+        for (key, value) in fields {
+            sst_file_writer.put(key.as_bytes(), value.as_bytes()).unwrap();
+        }
+        let _sst_file_info = sst_file_writer.finish().unwrap();
+
+        builder.finish().unwrap();
+
+        println!("Found {} errorneous lines", errors);
+        println!("Succesfully created {:?} dump.", random_name);
+    }
+}
+
+fn insert_document_words<'a, I, A, B>(builder: &mut MetadataBuilder<A, B>, doc_index: u64, attr: u8, words: I)
+where A: io::Write,
+      B: io::Write,
+      I: IntoIterator<Item=(usize, &'a str)>,
+{
+    for (index, word) in words {
+        let doc_index = DocIndex {
+            document: doc_index,
+            attribute: attr,
+            attribute_index: index as u32,
+        };
+        // insert the exact representation
+        let word_lower = word.to_lowercase();
+
+        // and the unidecoded lowercased version
+        let word_unidecoded = unidecode::unidecode(word).to_lowercase();
+        if word_lower != word_unidecoded {
+            builder.insert(word_unidecoded, doc_index);
+        }
+
+        builder.insert(word_lower, doc_index);
+    }
+}
+
+fn main() {
+    let command = CommandJsonLines::from_args();
+    let indexer = JsonLinesIndexer::from_command(command).unwrap();
+    indexer.index();
+}