move getModifiers into artigen, simplify its error handling a lot

src/artigen/dice/dice.d.ts

@@ -44,8 +44,9 @@ export interface RollModifiers {
   order: string;
   count: boolean;
   commaTotals: boolean;
-  valid: boolean;
   apiWarn: string;
+  valid: boolean;
+  error: Error;
 }
 
 // Basic conf interfaces

src/artigen/dice/getModifiers.ts

@@ -0,0 +1,104 @@
+import { log, LogTypes as LT } from '@Log4Deno';
+
+import { RollModifiers } from 'artigen/dice/dice.d.ts';
+
+export const getModifiers = (args: string[]): RollModifiers => {
+  const modifiers: RollModifiers = {
+    noDetails: false,
+    superNoDetails: false,
+    spoiler: '',
+    maxRoll: false,
+    minRoll: false,
+    nominalRoll: false,
+    gmRoll: false,
+    gms: [],
+    order: '',
+    count: false,
+    commaTotals: false,
+    apiWarn: '',
+    valid: false,
+    error: new Error(),
+  };
+
+  // Check if any of the args are command flags and pull those out into the modifiers object
+  for (let i = 0; i < args.length; i++) {
+    log(LT.LOG, `Checking ${args.join(' ')} for command modifiers ${i}`);
+    let defaultCase = false;
+    switch (args[i].toLowerCase()) {
+      case '-c':
+        modifiers.count = true;
+        break;
+      case '-nd':
+        modifiers.noDetails = true;
+        break;
+      case '-snd':
+        modifiers.superNoDetails = true;
+        break;
+      case '-s':
+        modifiers.spoiler = '||';
+        break;
+      case '-max':
+      case '-m':
+        modifiers.maxRoll = true;
+        break;
+      case '-min':
+        modifiers.minRoll = true;
+        break;
+      case '-n':
+        modifiers.nominalRoll = true;
+        break;
+      case '-gm':
+        modifiers.gmRoll = true;
+
+        // -gm is a little more complex, as we must get all of the GMs that need to be DMd
+        while (i + 1 < args.length && args[i + 1].startsWith('<@')) {
+          log(LT.LOG, `Finding all GMs, checking args ${JSON.stringify(args)}`);
+          // Keep looping thru the rest of the args until one does not start with the discord mention code
+          modifiers.gms.push(args[i + 1].replace(/!/g, ''));
+          args.splice(i + 1, 1);
+        }
+        if (modifiers.gms.length < 1) {
+          // If -gm is on and none were found, throw an error
+          modifiers.error.name = 'NoGMsFound';
+          modifiers.error.message = 'Must specify at least one GM by @mentioning them';
+          return modifiers;
+        }
+        break;
+      case '-o':
+        // Shift the -o out of the array so the next item is the direction
+        args.splice(i, 1);
+
+        if (!args[i] || (args[i].toLowerCase()[0] !== 'd' && args[i].toLowerCase()[0] !== 'a')) {
+          // If -o is on and asc or desc was not specified, error out
+          modifiers.error.name = 'NoOrderFound';
+          modifiers.error.message = 'Must specify `a` or `d` to order the rolls ascending or descending';
+          return modifiers;
+        }
+
+        modifiers.order = args[i].toLowerCase()[0];
+        break;
+      case '-ct':
+        modifiers.commaTotals = true;
+        break;
+      default:
+        // Default case should not mess with the array
+        defaultCase = true;
+        break;
+    }
+
+    if (!defaultCase) {
+      args.splice(i, 1);
+      i--;
+    }
+  }
+
+  // maxRoll, minRoll, and nominalRoll cannot be on at same time, throw an error
+  if ([modifiers.maxRoll, modifiers.minRoll, modifiers.nominalRoll].filter((b) => b).length > 1) {
+    modifiers.error.name = 'MaxAndNominal';
+    modifiers.error.message = 'Can only use one of the following at a time:\n`maximize`, `minimize`, `nominal`';
+    return modifiers;
+  }
+
+  modifiers.valid = true;
+  return modifiers;
+};