Merge pull request #82 from glotzerlab/report-no-matches

Report "No matches."

Author: joaander

.github/workflows/release.yaml

@@ -98,7 +98,7 @@ jobs:
         - aarch64-apple-darwin
         include:
         - target: x86_64-unknown-linux-gnu
-          runner: ubuntu-20.04
+          runner: ubuntu-22.04
         - target: aarch64-apple-darwin
           runner: macos-14
 

doc/src/release-notes.md

@@ -1,5 +1,20 @@
 # Release notes
 
+## 0.5.0 (not yet released)
+
+*Highlights:*
+
+**Row** 0.5 improves the user interface and updates the code to meet modern
+Rust standards.
+
+The subcommands `show directories`, `show jobs`, and `show status` now report
+`No matches.` when there are no results to show.
+
+*Changed:*
+
+* Writing tabular output with no rows now results in the output `No matches.`.
+* Build executables on Ubuntu 22.04.
+
 ## 0.4.0 (2024-12-06)
 
 *Highlights:*

src/ui.rs

@@ -70,25 +70,29 @@ impl<T: Write> Drop for MultiProgressWriter<T> {
     }
 }
 
+#[derive(Clone, Debug, PartialEq)]
 pub(crate) enum Alignment {
     Left,
     Right,
 }
 
 /// One item in a table.
+#[derive(Clone, Debug, PartialEq)]
 pub(crate) struct Item {
     text: String,
     style: Style,
     alignment: Alignment,
 }
 
 /// A table row is either a separator or a vector of items.
+#[derive(Clone, Debug, PartialEq)]
 pub(crate) enum Row {
     Separator,
     Items(Vec<Item>),
 }
 
 /// The table
+#[derive(Clone, Debug, PartialEq)]
 pub(crate) struct Table {
     // The header row.
     pub header: Vec<Item>,
@@ -154,6 +158,11 @@ impl Table {
     }
 
     pub(crate) fn write<W: Write>(&self, writer: &mut W) -> io::Result<()> {
+        if self.rows.is_empty() || self.rows.len() == 1 && self.rows[0] == Row::Separator {
+            writeln!(writer, "No matches.")?;
+            return Ok(());
+        }
+
         let mut column_width: Vec<usize> = self
             .header
             .iter()