Restore "table" --format from V1

* --format "table {{.field..." will print fields out in a table with
  headings.  Table keyword is removed, spaces between fields are
  converted to tabs
* Update parse.MatchesJSONFormat()'s regex to be more inclusive
* Add report.Headers(), obtain all the field names to be used as
  column headers, a map of field name to column headers may be provided
  to override the field names
* Update several commands to use new functions

Signed-off-by: Jhon Honce <jhonce@redhat.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/cmd/podman/report/format_test.go b/cmd/podman/report/format_test.go
new file mode 100644
index 000000000..7dd62e899
--- /dev/null
+++ b/cmd/podman/report/format_test.go
@@ -0,0 +1,35 @@
+package report
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestNormalizeFormat(t *testing.T) {
+	cases := []struct {
+		format   string
+		expected string
+	}{
+		{"table {{.ID}}", "{{.ID}}\n"},
+		{"table {{.ID}} {{.C}}", "{{.ID}}\t{{.C}}\n"},
+		{"{{.ID}}", "{{.ID}}\n"},
+		{"{{.ID}}\n", "{{.ID}}\n"},
+		{"{{.ID}} {{.C}}", "{{.ID}} {{.C}}\n"},
+		{"\t{{.ID}}", "\t{{.ID}}\n"},
+		{`\t` + "{{.ID}}", "\t{{.ID}}\n"},
+		{"table {{.ID}}\t{{.C}}", "{{.ID}}\t{{.C}}\n"},
+		{"{{.ID}} table {{.C}}", "{{.ID}} table {{.C}}\n"},
+	}
+	for _, tc := range cases {
+		tc := tc
+
+		label := strings.ReplaceAll(tc.format, " ", "<sp>")
+		t.Run("NormalizeFormat/"+label, func(t *testing.T) {
+			t.Parallel()
+			actual := NormalizeFormat(tc.format)
+			if actual != tc.expected {
+				t.Errorf("Expected %q, actual %q", tc.expected, actual)
+			}
+		})
+	}
+}