Catch flag parse error

1 files changed, 29 insertions, 19 deletions

diff --git a/source/app.d b/source/app.d
index 4669b5d..76f64b5 100644
--- a/source/app.d
+++ b/source/app.d
@@ -19,33 +19,43 @@ Opts defaultOpts() {
   return opts;
 }
 
+void printHelp(GetoptResult args) {
+  defaultGetoptPrinter("prim prompt:\n", args.options);
+  writeln("\nEnvironment:\n",
+    "\tNO_COLOR\tsee https://no-color.org");
+}
+
 void main(string[] argv) {
   Opts opts = defaultOpts();
 
-  GetoptResult args = getopt(
-    argv,
-    std.getopt.config.bundling,
-    "ps1|p", "print PS1", &opts.ps1,
-    "rps1|r", "print RPS1", &opts.rps1,
-    "preexec|x", "print preexec", &opts.preexec,
+  try {
+
+    GetoptResult args = getopt(
+      argv,
+      std.getopt.config.bundling,
+      "ps1|p", "print PS1", &opts.ps1,
+      "rps1|r", "print RPS1", &opts.rps1,
+      "preexec|x", "print preexec", &opts.preexec,
 
-    std.getopt.config.required,
-    "col", "terminal width", &opts.col,
+      std.getopt.config.required,
+      "col", "terminal width", &opts.col,
 
-    std.getopt.config.required,
-    "row", "terminal height", &opts.row,
+      std.getopt.config.required,
+      "row", "terminal height", &opts.row,
 
-    std.getopt.config.required,
-    "status", "previous command exit code", &opts.status,
+      std.getopt.config.required,
+      "status", "previous command exit code", &opts.status,
 
-    "pathlen", "set length of displayed path", &opts.pathlen,
-    "pchar", "override default prompt character", &opts.pchar,
-  );
+      "pathlen", "set length of displayed path", &opts.pathlen,
+      "pchar", "override default prompt character", &opts.pchar,
+    );
 
-  if (args.helpWanted) {
-    defaultGetoptPrinter("prim prompt:\n", args.options);
-    writeln("\nEnvironment:\n",
-      "\tNO_COLOR\tsee https://no-color.org");
+    if (args.helpWanted) {
+      printHelp(args);
+    }
+  } catch (Exception e) {
+    writeln(e.msg);
+    writeln("try '--help' for more information");
   }
 
   dorun(opts);