Add colored error message

Cargo.lock

@@ -83,6 +83,11 @@ name = "libc"
 version = "0.2.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "numtoa"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.2"
@@ -123,12 +128,26 @@ dependencies = [
  "proc-macro2 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.1.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "redox_termios"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "snekdown"
 version = "0.1.0"
 dependencies = [
  "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -178,6 +197,17 @@ dependencies = [
  "syn 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "termion"
+version = "1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -242,15 +272,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum hermit-abi 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "91780f809e750b0a89f5544be56617ff6b1227ee485bcb06ebe10cdf89bd3b71"
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)" = "9457b06509d27052635f90d6466700c65095fdf75409b3fbdd903e988b886f49"
+"checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
 "checksum proc-macro-error 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "98e9e4b82e0ef281812565ea4751049f1bdcdfccda7d3f459f2e138a40c08678"
 "checksum proc-macro-error-attr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4f5444ead4e9935abd7f27dc51f7e852a0569ac888096d5ec2499470794e2e53"
 "checksum proc-macro2 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)" = "1502d12e458c49a4c9cbff560d0fe0060c252bc29799ed94ca2ed4bb665a0101"
 "checksum quote 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "54a21852a652ad6f610c9510194f398ff6f8692e334fd1145fed931f7fbe44ea"
+"checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
+"checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "863246aaf5ddd0d6928dfeb1a9ca65f505599e4e1b399935ef7e75107516b4ef"
 "checksum structopt-derive 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "d239ca4b13aee7a2142e6795cbd69e457665ff8037aed33b3effdc430d2f927a"
 "checksum syn 1.0.29 (registry+https://github.com/rust-lang/crates.io-index)" = "bb37da98a55b1d08529362d9cbb863be17556873df2585904ab9d2bc951291d0"
 "checksum syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7be3539f6c128a931cf19dcee741c1af532c7fd387baa739c03dd2e96479338a"
+"checksum termion 1.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c22cec9d8978d906be5ac94bceb5a010d885c626c4c8855721a4dbd20e3ac905"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
 "checksum unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
 "checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"

Cargo.toml

@@ -8,4 +8,5 @@ edition = "2018"
 
 [dependencies]
 crossbeam-utils = "0.7.2"
-structopt = "0.3.14"
+structopt = "0.3.14"
+termion = "1.5.5"

src/parser.rs

@@ -9,6 +9,8 @@ use std::io;
 use std::path::Path;
 use std::sync::{Arc, Mutex};
 use std::thread;
+use termion::color::{self, Fg};
+use termion::style;
 
 macro_rules! parse_option {
     ($option:expr, $index:expr) => {
@@ -218,13 +220,23 @@ impl Parser {
         let path = self.transform_path(path);
         let path_info = Path::new(&path);
         if !path_info.exists() || !path_info.is_file() {
-            println!("Import of \"{}\" failed: The file doesn't exist.", path);
+            println!(
+                "{}Import of \"{}\" failed: The file doesn't exist.{}",
+                Fg(color::Yellow),
+                path,
+                style::Reset
+            );
             return Err(ParseError::new(self.index));
         }
         {
             let mut paths = self.paths.lock().unwrap();
             if paths.iter().find(|item| **item == path) != None {
-                println!("Import of \"{}\" failed: Cyclic reference.", path);
+                println!(
+                    "{}Import of \"{}\" failed: Cyclic reference.{}",
+                    Fg(color::Yellow),
+                    path,
+                    style::Reset
+                );
                 return Err(ParseError::new(self.index));
             }
             paths.push(path.clone());