1 files changed, 113 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..c3f15e6
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,113 @@
+#![allow(non_upper_case_globals)]
+#![allow(unused_variables)]
+
+use std::io::*;
+use std::fs::File;
+// note that bufread::MultiBzDecoder is _distinct_ from read::MultiBzDecoder
+use bzip2::bufread::*;
+
+// https://github.com/rust-lang/rfcs/issues/1349
+const version: &str = env!("CARGO_PKG_VERSION");
+const index_path: &str = env!("index_path");
+const dictionary_path: &str = env!("dictionary_path");
+
+pub fn handle(word: String) {
+    // if lets are kinda clunky
+    if let Some(definition) = lookup(&word) {
+        display(definition);
+    } else if let Some(corrected) = correct(&word) {
+        println!("Could not find word {}, continuing with {}...", word, corrected);
+        if let Some(definition) = lookup(&corrected) {
+            display(definition);
+        } else {
+            println!("Could not find corrected word {}.", corrected);
+        }
+    } else {
+        println!("Could not find word {}. Check your spelling?", word);
+    }
+}
+
+fn lookup(word: &str) -> Option<String> {
+    let file = File::open(index_path).expect("Failed to open index file");
+    let reader = BufReader::new(MultiBzDecoder::new(BufReader::new(file)));
+    for line in reader.lines() {
+        let line = line.expect("Failed to read line");
+
+        if line.len() > word.len() {
+            let diff = line.len() - word.len();
+
+            if line.get(diff..).unwrap_or_default() == word {
+                let line = line.splitn(3, ":").collect::<Vec<&str>>();
+
+                // format: file-offset:page-id:page-title
+                assert!(line.len() == 3);
+                let offset = line.get(0).unwrap().parse::<u64>()
+                    .expect("Failed to parse offset. Is your index file valid?");
+                let id = line.get(1).unwrap().parse::<u64>()
+                    .expect("Failed to parse id. Is your index file valid?");
+                let title = *line.get(2).unwrap(); // this dereference now makes sense
+                assert!(word == title);
+
+                let file = File::open(dictionary_path)
+                    .expect("Failed to open dictionary file");
+                let mut reader = BufReader::new(file);
+
+                // note: our chunk contains multiple pages
+                let offset = reader.seek(SeekFrom::Start(offset))
+                    .expect("Bad offset. Is your index file valid?");
+                let reader = BufReader::new(BzDecoder::new(reader));
+
+                let mut buffer = String::new();
+                let mut page = false;
+                for line in reader.lines() {
+                    let line = line.unwrap();
+                    if line == format!("    <title>{}</title>", title) {
+                        buffer.push_str("  <page>");
+                        buffer.push_str("\n");
+                        page = true;
+                    }
+                    if page {
+                        buffer.push_str(&line);
+                        buffer.push_str("\n");
+                        if line == "  </page>" {
+                            break;
+                        }
+                    }
+                }
+                return Some(buffer);
+            }
+        }
+    }
+    return None;
+}
+
+// http://norvig.com/spell-correct.html
+fn correct(word: &str) -> Option<&str> {
+    // todo: implement
+    return None;
+}
+
+// now we do inefficient string manipulation
+// but it's fine because we're working with MUCH smaller strings lol
+fn display(definition: String) {
+    // todo: implement
+    for line in definition.lines() {
+        println!("{}", line);
+    }
+}
+
+pub fn param(word: String) {
+    match word.as_str() { // curious about this
+        "--help" => {
+            println!("dictionarium {}", version);
+            println!("");
+            println!("Usage: dictionarium <word>");
+        },
+        "--full" => { // set some global variable
+
+        },
+        _ => {
+            println!("Unknown flag \"{}\".", word);
+        }
+    }
+}