cli: Suppress terminal color in abscissa

To avoid a panic in the terminal component initialization over
an attempt to install a global eyre handler after the application has
already done so, we need to tell the terminal to not use colors.

relayer-cli/src/application.rs

@@ -2,11 +2,12 @@
 
 use std::path::PathBuf;
 
-use abscissa_core::terminal::component::Terminal;
 use abscissa_core::{
     application::{self, AppCell},
     component::Component,
     config::{self, CfgCell},
+    terminal::component::Terminal,
+    terminal::ColorChoice,
     Application, Configurable, FrameworkError, FrameworkErrorKind, StandardPaths,
 };
 use ibc_relayer::config::Config;
@@ -180,4 +181,10 @@ impl Application for CliApp {
             Ok(vec![Box::new(terminal), Box::new(tracing)])
         }
     }
+
+    // Disable color support due to
+    // https://github.com/iqlusioninc/abscissa/issues/589
+    fn term_colors(&self, _command: &Self::Cmd) -> ColorChoice {
+        ColorChoice::Never
+    }
 }

relayer-cli/src/bin/hermes/main.rs

@@ -4,6 +4,7 @@
 #![forbid(unsafe_code)]
 
 use ibc_relayer_cli::application::APPLICATION;
+use ibc_relayer_cli::components::enable_ansi;
 
 fn main() -> eyre::Result<()> {
     install_error_reporter()?;
@@ -15,11 +16,14 @@ fn install_error_reporter() -> eyre::Result<()> {
     if !backtrace_enabled() {
         // If backtraces are disabled, display errors in single line.
         oneline_eyre::install()
+    } else if enable_ansi() {
+        // Else, if backtraces are enabled and we are in a terminal
+        // supporting color, display full error logs in color.
+        color_eyre::install()
     } else {
-        // Otherwise, backtraces are enabled, so use the
-        // default error report handler. The impl for
-        // Application::framework_components takes care about
-        // initialization of color_eyre.
+        // Otherwise, backtraces are enabled and we are piping to logs, so use the
+        // default error report handler, which displays multiline errors
+        // without color.
         Ok(())
     }
 }