allow :focus based verbs to take a pattern

This allows verb definitions such as the following ones:

```Hjson
    {
        invocation: "gos"
        execution: ":focus"
    }
    {
        invocation: "go {path}"
        execution: ":focus {path}"
    }
    {
        invocation: "goroot"
        execution: ":focus /"
    }
    {
        invocation: "gotar {path}"
        execution: ":focus {path}/target"
    }
```

Fix #389

1 files changed, 13 insertions, 0 deletions

diff --git a/src/app/selection.rs b/src/app/selection.rs
index e3a84f8..2fb56b7 100644
--- a/src/app/selection.rs
+++ b/src/app/selection.rs
@@ -96,6 +96,16 @@ impl Selection<'_> {
 }
 
 impl<'a> SelInfo<'a> {
+    pub fn from_path(path: &'a Path) -> Self {
+        Self::One(
+            Selection {
+                stype: SelectionType::from(path),
+                line: 0,
+                path,
+                is_exe: false, // OK, I don't know
+            }
+        )
+    }
     pub fn count_paths(&self) -> usize {
         match self {
             SelInfo::None => 0,
@@ -124,6 +134,9 @@ impl<'a> SelInfo<'a> {
             _ => None,
         }
     }
+    pub fn one_path(self) -> Option<&'a Path> {
+        self.one_sel().map(|sel| sel.path)
+    }
     pub fn extension(&self) -> Option<&str> {
         match self {
             SelInfo::None => None,