Migrate from the term crate to termcolor

The API of `termcolor` fits what the system gives us much more nicely and should
be well battle-tested from ripgrep. Additionally we don't really need huge
terminfo parsers, that wasn't every really the intention of the color support
here.

Author: alexcrichton

Cargo.lock

@@ -44,7 +44,7 @@ serde_json = "1.0"
 shell-escape = "0.1"
 tar = { version = "0.4", default-features = false }
 tempdir = "0.3"
-term = "0.4.4"
+termcolor = "0.3"
 toml = "0.4"
 url = "1.1"
 

Cargo.toml

@@ -15,7 +15,7 @@ use std::env;
 use std::fs;
 use std::path::{Path, PathBuf};
 
-use cargo::core::shell::{Verbosity, ColorConfig};
+use cargo::core::shell::{Shell, Verbosity};
 use cargo::util::{self, CliResult, lev_distance, Config, CargoResult, CargoError, CargoErrorKind};
 use cargo::util::CliError;
 
@@ -75,7 +75,7 @@ fn main() {
     let config = match Config::default() {
         Ok(cfg) => cfg,
         Err(e) => {
-            let mut shell = cargo::shell(Verbosity::Verbose, ColorConfig::Auto);
+            let mut shell = Shell::new();
             cargo::exit_with_error(e.into(), &mut shell)
         }
     };

src/bin/cargo.rs

@@ -29,7 +29,7 @@ Options:
 pub fn execute(options: Options, config: &Config) -> CliResult {
     debug!("executing; cmd=cargo-read-manifest; args={:?}",
            env::args().collect::<Vec<_>>());
-    config.shell().set_color_config(options.flag_color.as_ref().map(|s| &s[..]))?;
+    config.shell().set_color_choice(options.flag_color.as_ref().map(|s| &s[..]))?;
 
     let root = find_root_manifest_for_wd(options.flag_manifest_path, config.cwd())?;
 

src/bin/read_manifest.rs

@@ -6,7 +6,7 @@ pub use self::package_id::PackageId;
 pub use self::package_id_spec::PackageIdSpec;
 pub use self::registry::Registry;
 pub use self::resolver::Resolve;
-pub use self::shell::{Shell, MultiShell, ShellConfig, Verbosity, ColorConfig};
+pub use self::shell::{Shell, Verbosity};
 pub use self::source::{Source, SourceId, SourceMap, GitReference};
 pub use self::summary::Summary;
 pub use self::workspace::{Workspace, WorkspaceConfig};