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Implemented custom sorting algorithm to ensure command-line parameters are processed in the correct order

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This commit is contained in:
Edward Wright 2019-05-29 17:15:16 -04:00
parent 92dfc8a431
commit 15e9103f7e
1 changed files with 56 additions and 14 deletions
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70
SimplySerial/SimplySerial.cs
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@ -76,6 +76,7 @@ namespace SimplySerial
}
/// <summary>
/// Validates and processes any command-line arguments that were passed in. Invalid arguments will halt program execution.
/// </summary>
@ -85,19 +86,24 @@ namespace SimplySerial
// get a list of all available com ports
string[] availablePorts = SerialPort.GetPortNames();
// switch to lower case and remove '/', '--' and '-' from beginning of arguments - we can process correctly without them
for (int i = 0; i < args.Count(); i++)
args[i] = (args[i].TrimStart('/', '-')).ToLower();
// sort the parameters so that they get processed in order of priority (i.e. 'quiet' option gets processed before something that would normally result in console output)
Array.Sort(args, new ArgumentSorter());
// iterate through command-line arguments
foreach (string arg in args)
{
// split argument into components based on 'key:value' formatting
string[] argument = arg.Split(':');
// switch to lower case and remove '/', '--' and '-' from beginning of arguments - we can process correctly without them
argument[0] = (argument[0].TrimStart('/', '-')).ToLower();
// help
if (argument[0].StartsWith("h") || argument[0].StartsWith("?"))
{
ExitProgram("Sorry, you're on your own.", 0);
Console.WriteLine("Sorry, you're on your own.");
ExitProgram(silent: true);
}
// quiet (no output to console other than comes in via serial)
@ -115,7 +121,7 @@ namespace SimplySerial
// the remainder of possible command-line arguments require two parameters, so let's enforce that now
else if (argument.Count() < 2)
{
ExitProgram(("Invalid or incomplete argument <" + arg + ">\nTry 'SimplySerial help' to see a list of valid arguments"), -1);
ExitProgram(("Invalid or incomplete argument <" + arg + ">\nTry 'SimplySerial help' to see a list of valid arguments"), exitCode: -1);
}
// com port
@ -126,7 +132,7 @@ namespace SimplySerial
if (!argument[1].StartsWith("COM"))
newPort = "COM" + argument[1];
if (!availablePorts.Contains(newPort))
ExitProgram("Cannot find specified port <" + newPort + ">", -1);
ExitProgram(("Cannot find specified port <" + newPort + ">"), exitCode: -1);
port = newPort;
Output("PORT: " + port);
}
@ -160,7 +166,7 @@ namespace SimplySerial
}
else
{
ExitProgram(("Invalid or incomplete argument <" + arg + ">\nTry 'SimplySerial help' to see a list of valid arguments"), -1);
ExitProgram(("Invalid or incomplete argument <" + arg + ">\nTry 'SimplySerial help' to see a list of valid arguments"), exitCode: -1);
}
}
@ -168,12 +174,13 @@ namespace SimplySerial
if (availablePorts.Count() >= 1)
SimplySerial.port = availablePorts[0];
else
ExitProgram("No COM ports detected.", -1);
ExitProgram("No COM ports detected.", exitCode: -1);
ExitProgram("That's All Folks!", 1);
ExitProgram("That's All Folks!", exitCode: 1);
}
/// <summary>
/// Writes messages using Console.WriteLine() as long as the 'Quiet' option hasn't been enabled
/// </summary>
@ -183,22 +190,57 @@ namespace SimplySerial
if (!SimplySerial.Quiet)
Console.WriteLine(message);
}
/// <summary>
/// Writes the specified exit message to the console, then waits for user to press a key before halting program execution.
/// </summary>
/// <param name="message">Message to display - should indicate the reason why the program is terminating.</param>
/// <param name="exitCode">Code to return to parent process. Should be &lt;0 if an error occurred, &gt;=0 if program is terminating normally.</param>
static void ExitProgram(string message, int exitCode)
/// <param name="silent">Exits without displaying a message or asking for a key press when set to 'true'</param>
static void ExitProgram(string message="", int exitCode=0, bool silent=false)
{
Output(message);
Console.WriteLine("\nPress any key to exit...");
if (!SimplySerial.NoWait)
if (!silent)
Output(message);
if (!(SimplySerial.NoWait || silent))
{
// we output this line regardless of the 'quiet' option to make it clear that we're waiting for user input
Console.WriteLine("\nPress any key to exit...");
while (!Console.KeyAvailable)
Thread.Sleep(25);
}
Environment.Exit(exitCode);
}
}
/// <summary>
/// Custom string array sorting logic for SimplySerial command-line arguments
/// </summary>
public class ArgumentSorter : IComparer<string>
{
/// <summary>
/// Checks the first letter/character of incoming strings for a high-priority letter/character and sorts accordingly
/// </summary>
/// <param name="x">string to compare</param>
/// <param name="y">string to compare</param>
/// <returns>-1 if a priority character is found in string 'x', 1 if a priority character is found in 'y', 0 if neither string has a priority character</returns>
public int Compare(string x, string y)
{
// '?' or 'h' trigger the 'help' text output and supersede all other command-line arguments
// 'q' enables the 'quiet' option, which needs to be enabled before something that would normally generate console output
// 'n' enables the 'nowait' option, which needs to be enabled before anything that would trigger an artificial delay
foreach (char c in "?hqn")
{
if (x[0] == c)
return (-1);
else if (y[0] == c)
return (1);
}
// treat everything else equally, as processing order doesn't matter
return (0);
}
}
}