ColumnUDADuration: add "age" style which shows a more human-readable format

I just copied the logic for this from ColumnTypeDate. I also grepped around
for other instances of `formatVague`. I don't know what the argument means
but in this project it's set to `true` 100% of the time so I kept it that
way.

I am using the name "age" as suggested in
#3738

Author: apoelstra

src/columns/ColUDA.cpp

@@ -243,8 +243,8 @@ ColumnUDADuration::ColumnUDADuration() {
   _style = "default";
   _label = "";
   _uda = true;
-  _styles = {_style, "indicator", "iso"};
-  _examples = {"P30D", "U", "P30D"};
+  _styles = {_style, "indicator", "age", "iso"};
+  _examples = {"P30D", "U", "4w", "P30D"};
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -269,6 +269,9 @@ void ColumnUDADuration::measure(Task& task, unsigned int& minimum, unsigned int&
     if (_style == "default" || _style == "iso") {
       auto value = task.get(_name);
       if (value != "") minimum = maximum = Duration(value).formatISO().length();
+    } else if (_style == "age") {
+      auto value = task.get(_name);
+      if (value != "") minimum = maximum = Duration(value).formatVague(true).length();
     } else if (_style == "indicator") {
       if (task.has(_name)) {
         auto indicator = Context::getContext().config.get("uda." + _name + ".indicator");
@@ -288,6 +291,9 @@ void ColumnUDADuration::render(std::vector<std::string>& lines, Task& task, int
     if (_style == "default" || _style == "iso") {
       auto value = task.get(_name);
       renderStringRight(lines, width, color, Duration(value).formatISO());
+    } else if (_style == "age") {
+      auto value = task.get(_name);
+      renderStringRight(lines, width, color, Duration(value).formatVague(true));
     } else if (_style == "indicator") {
       auto indicator = Context::getContext().config.get("uda." + _name + ".indicator");
       if (indicator == "") indicator = "U";

test/columns.test.py

@@ -582,6 +582,14 @@ def test_uda_duration_format_iso(self):
             self.assertRegex(out, r"3\s+P60D")
             self.assertRegex(out, r"4\s+P30DT10H3M2S")
 
+    def test_uda_duration_format_age(self):
+        """Verify uda_duration.age formatting"""
+        code, out, err = self.t("xxx rc.report.xxx.columns:id,uda_duration.age")
+        self.assertRegex(out, r"1\s+")
+        self.assertRegex(out, r"2\s+[0-9]+[wmin]+")
+        self.assertRegex(out, r"3\s+[0-9]+[wmin]+")
+        self.assertRegex(out, r"4\s+[0-9]+[wmin]+")
+
 
 class TestFeature1061(TestCase):
     def setUp(self):