Performance improvement for csv-report (#136)

* Remove multiple clones

* Use xlsxwriter instead of simple-excel-writer

* Use slice instead of vec

* Update CHANGELOG.md

Author: fxwiegand

CHANGELOG.md

@@ -2,9 +2,13 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.19.7] - 2021-03-09
+### Changed
+- Performance improvement for `rbt csv-report`.
+
 ## [0.19.6] - 2021-03-09
 ### Changed
-- Fixed a JSON syntax error in `rbt vcf-report`
+- Fixed a JSON syntax error in `rbt vcf-report`.
 
 ## [0.19.5] - 2021-03-05
 ### Changed

Cargo.toml

@@ -40,7 +40,7 @@ regex = "1.3"
 tera = "1"
 jsonm = "0.1.4"
 chrono = "0.4"
-simple_excel_writer="0.1.4"
+xlsxwriter = "0.3.2"
 lazy_static = "1.4"
 anyhow = "1"
 thiserror = "1"

src/csv/report.rs

@@ -7,13 +7,14 @@ use itertools::Itertools;
 use lz_str::compress_to_utf16;
 use serde_derive::Serialize;
 use serde_json::json;
-use simple_excel_writer::*;
 use std::collections::{HashMap, HashSet};
+use std::convert::TryInto;
 use std::fs;
 use std::io::Write;
 use std::path::Path;
 use std::str::FromStr;
 use tera::{Context, Tera};
+use xlsxwriter::*;
 
 type LookupTable = HashMap<String, HashMap<String, Vec<(String, usize, usize)>>>;
 
@@ -85,11 +86,11 @@ pub(crate) fn csv_report(
     for title in &titles {
         match is_numeric.get(title) {
             Some(true) => {
-                let plot = num_plot(table.clone(), title.to_string());
+                let plot = num_plot(&table, title.to_string());
                 num_plot_data.insert(title, plot);
             }
             Some(false) => {
-                let plot = nominal_plot(table.clone(), title.to_string());
+                let plot = nominal_plot(&table, title.to_string());
                 plot_data.insert(title, plot);
             }
             _ => unreachable!(),
@@ -118,28 +119,22 @@ pub(crate) fn csv_report(
         (_, _) => {}
     }
 
-    let mut wb = Workbook::create(&(output_path.to_owned() + "/report.xlsx"));
-    let mut sheet = wb.create_sheet("Report");
-    for _ in 1..titles.len() {
-        sheet.add_column(Column { width: 50.0 });
+    let wb = Workbook::new(&(output_path.to_owned() + "/report.xlsx"));
+    let mut sheet = wb.add_worksheet(Some("Report"))?;
+    for (i, title) in titles.iter().enumerate() {
+        sheet.write_string(0, i.try_into()?, title, None)?;
     }
 
-    wb.write_sheet(&mut sheet, |sheet_writer| {
-        let sw = sheet_writer;
-        let mut title_row = Row::new();
-        for title in titles.clone() {
-            title_row.add_cell(title);
-        }
-        sw.append_row(title_row)?;
-        for row in table.clone() {
-            let mut excel_row = Row::new();
-            for title in titles.clone() {
-                excel_row.add_cell(row.get(title).unwrap().as_str());
-            }
-            sw.append_row(excel_row)?;
+    for (i, row) in table.iter().enumerate() {
+        for (c, title) in titles.iter().enumerate() {
+            sheet.write_string(
+                (i + 1).try_into()?,
+                c.try_into()?,
+                row.get(*title).unwrap(),
+                None,
+            )?;
         }
-        Ok(())
-    })?;
+    }
 
     wb.close()?;
 
@@ -341,7 +336,7 @@ pub(crate) fn csv_report(
     Ok(())
 }
 
-fn num_plot(table: Vec<HashMap<String, String>>, column: String) -> Vec<BinnedPlotRecord> {
+fn num_plot(table: &[HashMap<String, String>], column: String) -> Vec<BinnedPlotRecord> {
     let mut values = Vec::new();
     let mut nan = 0;
     for row in table {
@@ -390,7 +385,7 @@ fn num_plot(table: Vec<HashMap<String, String>>, column: String) -> Vec<BinnedPl
     plot_data
 }
 
-fn nominal_plot(table: Vec<HashMap<String, String>>, column: String) -> Vec<PlotRecord> {
+fn nominal_plot(table: &[HashMap<String, String>], column: String) -> Vec<PlotRecord> {
     let mut values = Vec::new();
     for row in table {
         let val = row.get(&column).unwrap();