proper coalesce bamcompare, make tempzip struct global

src/bamcompare.rs

@@ -8,7 +8,7 @@ use std::fs::File;
 use itertools::Itertools;
 use bigtools::{Value};
 use crate::filehandler::{bam_ispaired, write_covfile};
-use crate::covcalc::{bam_pileup, parse_regions, Alignmentfilters, region_divider};
+use crate::covcalc::{bam_pileup, parse_regions, Alignmentfilters, TempZip, region_divider};
 use crate::normalization::scale_factor_bamcompare;
 use crate::calc::{median, calc_ratio};
 use tempfile::{TempPath};
@@ -68,7 +68,7 @@ pub fn r_bamcompare(
     // Set up the bam files in a Vec.
     let bamfiles = vec![(bamifile1, ispe1), (bamifile2, ispe2)];
 
-    let covcalcs: Vec<ParsedBamFile> = pool.install(|| {
+    let mut covcalcs: Vec<ParsedBamFile> = pool.install(|| {
         bamfiles.par_iter()
             .map(|(bamfile, ispe)| {
                 let (bg, mapped, unmapped, readlen, fraglen) = regionblocks.par_iter()
@@ -102,45 +102,44 @@ pub fn r_bamcompare(
     println!("scale factor1 = {}, scale factor2 = {}", sf.0, sf.1);
     // Create output stream
     let mut chrom = "".to_string();
-    let lines = covcalcs[0].bg.iter().zip(covcalcs[1].bg.iter()).flat_map(
-        |(t1, t2)| {
-            let reader1 = BufReader::new(File::open(t1).unwrap()).lines();
-            let reader2 = BufReader::new(File::open(t2).unwrap()).lines();
 
-            reader1.zip(reader2).map(
-                |(l1, l2)| {
-                    let l1 = l1.unwrap();
-                    let l2 = l2.unwrap();
-                    let fields1: Vec<&str> = l1.split('\t').collect();
-                    let fields2: Vec<&str> = l2.split('\t').collect();
-
-                    let chrom1: String = fields1[0].to_string();
-                    let chrom2: String = fields2[0].to_string();
-                    let start1: u32 = fields1[1].parse().unwrap();
-                    let start2: u32 = fields2[1].parse().unwrap();
-                    let end1: u32 = fields1[2].parse().unwrap();
-                    let end2: u32 = fields2[2].parse().unwrap();
-
-                    // Assert the regions are equal.
-                    assert_eq!(chrom1, chrom2);
-                    assert_eq!(start1, start2);
-                    assert_eq!(end1, end2);
-
-                    // Calculate the coverage.
-                    let cov1: f32 = fields1[3].parse().unwrap();
-                    let cov2: f32 = fields2[3].parse().unwrap();
-                    let cov = calc_ratio(cov1, cov2, &sf.0, &sf.1, &pseudocount, operation);
-
-                    (chrom1, Value { start: start1, end: end1, value: cov })
-                }).coalesce(|p, c| {
-                if p.1.value == c.1.value {
-                    Ok((p.0, Value {start: p.1.start, end: c.1.end, value: p.1.value}))
-                } else {
-                    Err((p, c))
-                }
-            })
-        }
-    );
+    // Extract both vecs of TempPaths into a single vector
+    let its = vec![
+        covcalcs[0].bg.drain(..).collect::<Vec<_>>(),
+        covcalcs[1].bg.drain(..).collect::<Vec<_>>()
+    ];
+    let its: Vec<_> = its.iter().map(|x| x.into_iter()).collect();
+    let zips = TempZip { iterators: its };
+    let zips_vec: Vec<_> = zips.collect();
+
+    let lines = zips_vec
+    .into_iter()
+    .flat_map(|c| {
+        let readers: Vec<_> = c.into_iter().map(|x| BufReader::new(File::open(x).unwrap()).lines()).collect();
+        let temp_zip = TempZip { iterators: readers };
+        temp_zip.into_iter().map(|mut _l| {
+            let lines: Vec<_> = _l
+                .iter_mut()
+                .map(|x| x.as_mut().unwrap())
+                .map(|x| x.split('\t').collect())
+                .map(|x: Vec<&str>| (x[0].to_string(), x[1].parse::<u32>().unwrap(), x[2].parse::<u32>().unwrap(), x[3].parse::<f32>().unwrap()))
+                .collect();
+            assert_eq!(lines.len(), 2);
+            assert_eq!(lines[0].0, lines[1].0);
+            assert_eq!(lines[0].1, lines[1].1);
+            assert_eq!(lines[0].2, lines[1].2);
+            // Calculate the coverage.
+            let cov = calc_ratio(lines[0].3, lines[1].3, &sf.0, &sf.1, &pseudocount, operation);
+            (lines[0].0.clone(), Value { start: lines[0].1, end: lines[0].2, value: cov })
+        }).coalesce(|p, c| {
+            if p.1.value == c.1.value && p.0 == c.0 {
+                Ok((p.0, Value {start: p.1.start, end: c.1.end, value: p.1.value}))
+            } else {
+                Err((p, c))
+            }
+        })
+    });
+
     write_covfile(lines, ofile, ofiletype, chromsizes);
     Ok(())
 }

src/covcalc.rs

@@ -1476,3 +1476,17 @@ impl Bin {
         }
     }
 }
+
+pub struct TempZip<I>
+where I: Iterator {
+    pub iterators: Vec<I>
+}
+
+impl<I, T> Iterator for TempZip<I>
+where I: Iterator<Item=T> {
+    type Item = Vec<T>;
+    fn next(&mut self) -> Option<Self::Item> {
+        let o: Option<Vec<T>> = self.iterators.iter_mut().map(|x| x.next()).collect();
+        o
+    }
+}

src/multibamsummary.rs

@@ -13,7 +13,7 @@ use std::borrow::Cow;
 use std::collections::HashMap;
 use std::path::Path; 
 use std::sync::{Arc, Mutex};
-use crate::covcalc::{bam_pileup, parse_regions, Alignmentfilters, region_divider};
+use crate::covcalc::{bam_pileup, parse_regions, Alignmentfilters, TempZip, region_divider};
 use crate::filehandler::{bam_ispaired, read_bedfile, read_gtffile, chrombounds_from_bam, is_bed_or_gtf};
 use crate::calc::{median, calc_ratio, deseq_scalefactors};
 use crate::bamcompare::ParsedBamFile;
@@ -268,18 +268,4 @@ pub fn r_mbams(
         println!("Matrix written.");
     }
     Ok(())
-}
-
-struct TempZip<I>
-where I: Iterator {
-    iterators: Vec<I>
-}
-
-impl<I, T> Iterator for TempZip<I>
-where I: Iterator<Item=T> {
-    type Item = Vec<T>;
-    fn next(&mut self) -> Option<Self::Item> {
-        let o: Option<Vec<T>> = self.iterators.iter_mut().map(|x| x.next()).collect();
-        o
-    }
 }