add 'ta config path'

cli/src/argparse/config.rs

@@ -1,13 +1,15 @@
 use super::args::{any, arg_matching, literal};
 use super::ArgList;
 use crate::usage;
-use nom::{combinator::*, sequence::*, IResult};
+use nom::{branch::alt, combinator::*, sequence::*, IResult};
 
 #[derive(Debug, PartialEq)]
 /// A config operation
 pub(crate) enum ConfigOperation {
     /// Set a configuration value
     Set(String, String),
+    /// Show configuration path
+    Path,
 }
 
 impl ConfigOperation {
@@ -15,14 +17,20 @@ impl ConfigOperation {
         fn set_to_op(input: (&str, &str, &str)) -> Result<ConfigOperation, ()> {
             Ok(ConfigOperation::Set(input.1.to_owned(), input.2.to_owned()))
         }
-        map_res(
-            tuple((
-                arg_matching(literal("set")),
-                arg_matching(any),
-                arg_matching(any),
-            )),
-            set_to_op,
-        )(input)
+        fn path_to_op(_: &str) -> Result<ConfigOperation, ()> {
+            Ok(ConfigOperation::Path)
+        }
+        alt((
+            map_res(
+                tuple((
+                    arg_matching(literal("set")),
+                    arg_matching(any),
+                    arg_matching(any),
+                )),
+                set_to_op,
+            ),
+            map_res(arg_matching(literal("path")), path_to_op),
+        ))(input)
     }
 
     pub(super) fn get_usage(u: &mut usage::Usage) {

cli/src/invocation/cmd/config.rs

@@ -19,6 +19,13 @@ pub(crate) fn execute<W: WriteColor>(
             writeln!(w, "{:?}.", filename)?;
             w.set_color(ColorSpec::new().set_bold(false))?;
         }
+        ConfigOperation::Path => {
+            if let Some(ref filename) = settings.filename {
+                writeln!(w, "{}", filename.to_string_lossy())?;
+            } else {
+                return Err(anyhow::anyhow!("No configuration filename found").into());
+            }
+        }
     }
     Ok(())
 }