chore: better ffi

lua/ivy/libivy.lua

@@ -7,9 +7,12 @@ local ffi = require "ffi"
 local ivy_c = ffi.load(library_path)
 
 ffi.cdef [[
+    typedef struct {  int score; const char* content; } match;
+    typedef struct {  int len; match* matches; } match_list;
+
     void ivy_init(const char*);
     int ivy_match(const char*, const char*);
-    char* ivy_files(const char*, const char*);
+    match_list* ivy_files(const char*, const char*);
 ]]
 
 local libivy = {}
@@ -23,7 +26,7 @@ libivy.ivy_match = function(pattern, text)
 end
 
 libivy.ivy_files = function(pattern, base_dir)
-  return ffi.string(ivy_c.ivy_files(pattern, base_dir))
+  return ivy_c.ivy_files(pattern, base_dir)
 end
 
 return libivy

lua/ivy/libivy_test.lua

@@ -1,4 +1,5 @@
 local libivy = require "ivy.libivy"
+local ffi = require "ffi"
 
 it("should run a simple match", function(t)
   local score = libivy.ivy_match("term", "I am a serch term")

lua/ivy/window.lua

@@ -1,3 +1,5 @@
+local ffi = require "ffi"
+
 -- Constent options that will be used for the keymaps
 local opts = { noremap = true, silent = true, nowait = true }
 
@@ -22,12 +24,12 @@ local function string_to_table(lines)
 end
 
 local function set_items_string(buffer, lines)
-  vim.api.nvim_buf_set_lines(buffer, 0, 9999, false, string_to_table(lines))
+  vim.api.nvim_buf_set_lines(buffer, 0, -1, false, string_to_table(lines))
 end
 
 local function set_items_array(buffer, lines)
   if type(lines[1]) == "string" then
-    vim.api.nvim_buf_set_lines(buffer, 0, 9999, false, lines)
+    vim.api.nvim_buf_set_lines(buffer, 0, -1, false, lines)
   else
     for i = 1, #lines do
       vim.api.nvim_buf_set_lines(buffer, i - 1, 9999, false, { lines[i][2] })
@@ -112,7 +114,13 @@ window.update = function()
 end
 
 window.set_items = function(items)
-  if #items == 0 then
+  vim.api.nvim_buf_set_lines(window.get_buffer(), 0, -1, false, {})
+
+  if items.len ~= nil then
+    for i = 0, items.len - 1 do
+      vim.api.nvim_buf_set_lines(window.get_buffer(), i - 1, -1, false, { ffi.string(items.matches[i].content) })
+    end
+  elseif #items == 0 then
     vim.api.nvim_buf_set_lines(window.get_buffer(), 0, 9999, false, { "-- No Items --" })
   elseif type(items) == "string" then
     set_items_string(window.get_buffer(), items)

rust/lib.rs

@@ -4,9 +4,15 @@ mod sorter;
 
 use std::collections::HashMap;
 use std::ffi::CStr;
-use std::ffi::CString;
 use std::os::raw::{c_char, c_int};
 use std::sync::Mutex;
+use std::mem;
+
+#[repr(C)]
+pub struct FFiMatchList {
+    len: c_int,
+    matches: *mut sorter::Match
+}
 
 #[macro_use]
 extern crate lazy_static;
@@ -22,6 +28,15 @@ fn to_string(input: *const c_char) -> String {
         .to_string()
 }
 
+fn to_ffi_match_list(mut list: Vec<sorter::Match>) -> *const FFiMatchList {
+    list.shrink_to_fit();
+    let matches = list.as_mut_ptr();
+    let len: c_int = list.len().try_into().unwrap();
+    mem::forget(list);
+
+    return Box::into_raw(Box::new(FFiMatchList { len, matches }))
+}
+
 fn get_files(directory: &String) -> Vec<String> {
     let mut cache = GLOBAL_FILE_CACHE.lock().unwrap();
     if !cache.contains_key(directory) {
@@ -55,32 +70,21 @@ pub fn inner_match(pattern: String, text: String) -> i32 {
 }
 
 #[no_mangle]
-pub extern "C" fn ivy_files(c_pattern: *const c_char, c_base_dir: *const c_char) -> *const c_char {
+pub extern "C" fn ivy_files(c_pattern: *const c_char, c_base_dir: *const c_char) -> *const FFiMatchList {
     let pattern = to_string(c_pattern);
     let directory = to_string(c_base_dir);
 
-    let output = inner_files(pattern, directory);
-
-    CString::new(output).unwrap().into_raw()
+    return inner_files(pattern, directory);
 }
 
-pub fn inner_files(pattern: String, base_dir: String) -> String {
-    let mut output = String::new();
-
+pub fn inner_files(pattern: String, base_dir: String) -> *const FFiMatchList {
     // Bail out early if the pattern is empty; it's never going to find anything
     if pattern.is_empty() {
-        return output;
+        return to_ffi_match_list(Vec::new());
     }
 
     let files = get_files(&base_dir);
 
     let sorter_options = sorter::Options::new(pattern);
-
-    let files = sorter::sort_strings(sorter_options, files);
-    for file in files.iter() {
-        output.push_str(&file.content);
-        output.push('\n');
-    }
-
-    output
+    to_ffi_match_list(sorter::sort_strings(sorter_options, files))
 }

rust/sorter.rs

@@ -1,11 +1,18 @@
 use super::matcher;
 use rayon::prelude::*;
+use std::os::raw::{c_char, c_int};
+use std::ffi::CString;
 
+#[repr(C)]
 pub struct Match {
-    pub score: i64,
-    pub content: String,
+    pub score: c_int,
+    pub content: *const c_char
+    // pub score: i64,
+    // pub content: String,
 }
 
+unsafe impl Send for Match {}
+
 pub struct Options {
     pub pattern: String,
     pub minimum_score: i64,
@@ -26,10 +33,10 @@ pub fn sort_strings(options: Options, strings: Vec<String>) -> Vec<Match> {
     let mut matches = strings
         .into_par_iter()
         .map(|candidate| Match {
-            score: matcher.score(candidate.as_str()),
-            content: candidate,
+            score: matcher.score(candidate.as_str()) as i32,
+            content: CString::new(candidate.clone().to_string()).unwrap().into_raw(),
         })
-        .filter(|m| m.score > options.minimum_score)
+        .filter(|m| m.score > options.minimum_score as i32)
         .collect::<Vec<Match>>();
     matches.par_sort_unstable_by(|a, b| a.score.cmp(&b.score));
     matches