digitalmars.D.learn - Help Required on Getopt
- Vino.B (54/54) Sep 01 2017 Hi All,
- Jon Degenhardt (7/11) Sep 01 2017 Hi Vino,
- Vino.B (3/16) Sep 01 2017 Hi,
- Daniel Kozak via Digitalmars-d-learn (8/25) Sep 01 2017 I have same issue. How this help you? Catching exception does not help...
- Jon Degenhardt (13/15) Sep 01 2017 Your are correct, sorry about that. What my response showed is
Hi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu Program: import std.stdio; import std.getopt; string r; void main (string[] args) { getopt(args, std.getopt.config.caseInsensitive, std.getopt.config.stopOnFirstNonOption, "r" , &r); switch (r) { case "Test1" : Test1; break; case "Test2" : Test2; break; default : writeln("Unknown operation"); Help; } } void Test1 () { writeln("This is Test 1"); } void Test2 () { writeln("This is Test 2"); } void Help () { writeln("This is Help Menu"); } Execution: Works fine if i execute the program with below options rdmd D1.d rdmd D1.d -r Test1 rdmd D1.d -r Test2 rdmd D1.d -r Help but fails with below error when i execute the program as rdmd D1.d -r Requirement : If i execute the program as "rdmd D1.d -r" is should show me the "Help" Menu rather than the below error/ Output: C:\Admin\Desktop\Current\Script\D>rdmd D1.d -r object.Exception C:\D\dmd2\windows\bin\..\..\src\phobos\std\getopt.d(880): Missing value for argument -r. ---------------- 0x00402493 0x004043AC 0x00402999 0x004025FE 0x004025C5 0x0040239B 0x00402236 0x0040B47F 0x0040B443 0x0040B344 0x00405E07 0x76CB336A in BaseThreadInitThunk 0x77CF9902 in RtlInitializeExceptionChain 0x77CF98D5 in RtlInitializeExceptionChain From, Vino.B
Sep 01 2017
On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote:Hi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu [snip...]Hi Vino, To get good error message behavior you need to put the construct in a try-catch block. Then you can choose how to respond. An example here: https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-append/src/tsv append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of that as well in the above code block, look for the 'if (r.helpWanted)' test. --Jon
Sep 01 2017
On Friday, 1 September 2017 at 17:23:01 UTC, Jon Degenhardt wrote:On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote:Hi, Thank you very much, that helped me to resolve the issue.Hi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu [snip...]Hi Vino, To get good error message behavior you need to put the construct in a try-catch block. Then you can choose how to respond. An example here: https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-append/src/tsv append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of that as well in the above code block, look for the 'if (r.helpWanted)' test. --Jon
Sep 01 2017
I have same issue. How this help you? Catching exception does not help. How do I catch exception and still print help message? Dne 1. 9. 2017 8:10 odpoledne napsal u=C5=BEivatel "Vino.B via Digitalmars-d-learn" <digitalmars-d-learn puremagic.com>: On Friday, 1 September 2017 at 17:23:01 UTC, Jon Degenhardt wrote:On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote:atHi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu [snip...]Hi Vino, To get good error message behavior you need to put the construct in a try-catch block. Then you can choose how to respond. An example here: https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-appe nd/src/tsv-append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of th=as well in the above code block, look for the 'if (r.helpWanted)' test. --JonHi, Thank you very much, that helped me to resolve the issue.
Sep 01 2017
On Friday, 1 September 2017 at 19:04:39 UTC, Daniel Kozak wrote:I have same issue. How this help you? Catching exception does not help. How do I catch exception and still print help message?Your are correct, sorry about that. What my response showed is how to avoid printing the full stack trace and instead printing a more nicely formatted error message. And separately, how to print formatted help. But, you are correct in that you can't directly print the formatted help text from the catch block as shown. In particular, the GetoptResult returned by getopt is not available. I don't have any examples that try to work around this. Presumably one could call getopt again to get the options list, then generate the formatted help. It'd be an annoyance, though perhaps judicious use of AliasSeq might make the code structure reasonable. --Jon
Sep 01 2017