feat: add error messaging (#1576)

This creates a custom logger for the log crate which logs everything to a file (/tmp/starship/session_$STARSHIP_SESSION_KEY.log) and it logs everything above Warn to stderr, but only if the log file does not contain the line that should be logged resulting in an error or warning to be only logged at the first starship invocation after opening the shell.

1 files changed, 13 insertions, 2 deletions

diff --git a/src/main.rs b/src/main.rs
index 3afcf6b3d..46dc86e25 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ mod configure;
 mod context;
 mod formatter;
 mod init;
+mod logger;
 mod module;
 mod modules;
 mod print;
@@ -20,9 +21,11 @@ mod test;
 
 use crate::module::ALL_MODULES;
 use clap::{App, AppSettings, Arg, Shell, SubCommand};
+use rand::distributions::Alphanumeric;
+use rand::Rng;
 
 fn main() {
-    pretty_env_logger::init_custom_env("STARSHIP_LOG");
+    logger::init();
 
     let status_code_arg = Arg::with_name("status_code")
         .short("s")
@@ -153,7 +156,8 @@ fn main() {
                         .required(true)
                         .env("STARSHIP_SHELL"),
                 ),
-        );
+        )
+        .subcommand(SubCommand::with_name("session").about("Generate random session key"));
 
     let matches = app.clone().get_matches();
 
@@ -209,6 +213,13 @@ fn main() {
 
             app.gen_completions_to("starship", shell, &mut io::stdout().lock());
         }
+        ("session", _) => println!(
+            "{}",
+            rand::thread_rng()
+                .sample_iter(&Alphanumeric)
+                .take(16)
+                .collect::<String>()
+        ),
         (command, _) => unreachable!("Invalid subcommand: {}", command),
     }
 }