vgrep [no grep args]: print matches

`vgrep` should print previously cached results when it's run without
grep arguments.  At some yet unknown point in time, we regressed on
it which is calling for regression tests that are now added

Fixes: #132
Signed-off-by: Valentin Rothberg <[email protected]>

test/simple.bats

@@ -18,30 +18,50 @@ load helpers
 	run_vgrep --no-git f
 	[ "$status" -eq 0 ]
 	[[ ${lines[0]} =~ "0" ]]
+
+	run_vgrep
+	[ "$status" -eq 0 ]
+	[[ ${lines[0]} =~ "0" ]]
 }
 
 @test "Simple search and --no-ripgrep" {
 	run_vgrep --no-ripgrep f
 	[ "$status" -eq 0 ]
 	[[ ${lines[0]} =~ "0" ]]
+
+	run_vgrep
+	[ "$status" -eq 0 ]
+	[[ ${lines[0]} =~ "0" ]]
 }
 
 @test "Simple search and --no-git --no-ripgrep" {
 	run_vgrep --no-git --no-ripgrep f
 	[ "$status" -eq 0 ]
 	[[ ${lines[0]} =~ "0" ]]
+
+	run_vgrep
+	[ "$status" -eq 0 ]
+	[[ ${lines[0]} =~ "0" ]]
 }
 
 @test "Simple search and --no-header" {
 	run_vgrep --no-header f
 	[ "$status" -eq 0 ]
 	[[ ${lines[0]} =~ "0" ]]
+
+	run_vgrep
+	[ "$status" -eq 0 ]
+	[[ ${lines[0]} =~ "0" ]]
 }
 
 @test "Simple search and --no-less" {
 	run_vgrep --no-less f
 	[ "$status" -eq 0 ]
 	[[ ${lines[0]} =~ "0" ]]
+
+	run_vgrep --no-less
+	[ "$status" -eq 0 ]
+	[[ ${lines[0]} =~ "0" ]]
 }
 
 # Check that all grep tools are used when expected

vgrep.go

@@ -137,9 +137,11 @@ func main() {
 			os.Exit(1)
 		}
 
-		// Execute the specified command and/or jump directly into the
-		// interactive shell.
-		v.commandParse()
+		if haveToRunCommand {
+			v.commandParse()
+		} else {
+			v.commandPrintMatches([]int{})
+		}
 		v.waiter.Wait()
 		os.Exit(0)
 	}