drop human-panic and make error display a bit cleaner (#30)

* drop human panic & switch to anyhow for errors.

Cargo.toml

@@ -9,18 +9,18 @@ resolver = "2"
 docopt = "*"
 rust-htslib = "0.38"
 flate2 = { version = "1.0", features = ["zlib"], default-features = false }
-shardio = { git = "https://github.com/10XGenomics/rust-shardio.git" }
+shardio = "0.8.1"
 bincode = "1"
 itertools = ">=0.8.0"
 regex = "*"
 tempfile = "*"
+backtrace = "0.3"
 
 csv = "1.0.0"
 serde = "^1.0.7"
 serde_derive = "^1"
 serde_bytes = "*"
-failure = "*"
-human-panic = "1"
+anyhow = { version = "1.0", features = ["backtrace"] }
 
 [profile.release]
 debug = 1

src/bx_index.rs

@@ -8,8 +8,7 @@ use rust_htslib::bam::record::{Aux, Record};
 use rust_htslib::bam::Read;
 use serde::Deserialize;
 
-use failure::Error;
-use failure::ResultExt;
+use anyhow::{Context, Error};
 
 #[derive(Deserialize, Ord, PartialOrd, Eq, PartialEq)]
 struct BcObs {

src/locus.rs

@@ -1,7 +1,6 @@
 // Copyright (c) 2020 10x Genomics, Inc. All rights reserved.
 
-use failure::format_err;
-use failure::Error;
+use anyhow::{anyhow, Error};
 use regex::Regex;
 use serde::Deserialize;
 use std::fmt;
@@ -33,7 +32,7 @@ impl FromStr for Locus {
         let cap = re.captures(s);
 
         if cap.is_none() {
-            return Err(format_err!("invalid locus string: {}", s));
+            return Err(anyhow!("invalid locus string: {}", s));
         }
 
         let cap = cap.unwrap();