un-workspace

src/command_helpers.rs

@@ -0,0 +1,33 @@
+use std::fmt::Display;
+use std::io::Stdin;
+use std::str::FromStr;
+
+use clap::ArgMatches;
+pub use {clap, serde};
+
+pub fn default_arg_parser<T>(arg: &str, _: &ArgMatches) -> Result<T, clap::Error>
+where
+    T: FromStr,
+    T::Err: Display,
+{
+    arg.parse()
+        .map_err(|e| clap::Error::raw(clap::error::ErrorKind::ValueValidation, e))
+}
+
+pub fn default_stdin_parser<T>(stdin: &mut Stdin, _: &ArgMatches) -> Result<T, clap::Error>
+where
+    T: FromStr,
+    T::Err: Display,
+{
+    let mut s = String::new();
+    stdin
+        .read_line(&mut s)
+        .map_err(|e| clap::Error::raw(clap::error::ErrorKind::Io, e))?;
+    if let Some(s) = s.strip_suffix("\n") {
+        s
+    } else {
+        &s
+    }
+    .parse()
+    .map_err(|e| clap::Error::raw(clap::error::ErrorKind::ValueValidation, e))
+}