fix: improve CLI messages and move them into separate file

src/hooks/context/models.ts

@@ -1,3 +1,4 @@
+import * as messages from '../../messages';
 export interface Context {
 	current: string,
 	store: {
@@ -15,41 +16,41 @@ export class SpecFileNotFoundError extends Error {
 export class ContextFileNotFoundError extends Error {
   constructor() {
     super();
-    this.message = 'No contexts saved yet, run asyncapi --help to know more.';
+    this.message = messages.NO_CONTEXTS_SAVED;
   }
 }
 
 export class ContextNotFoundError extends Error {
   constructor() {
     super();
-    this.message = 'This context key does not exist.';
+    this.message = messages.CONTEXT_NOT_FOUND;
   }
 }
 
 export class KeyNotFoundError extends Error {
   constructor() {
     super();
-    this.message = 'Key not found.';
+    this.message = messages.KEY_NOT_FOUND;
   }
 }
 
 export class DeletingCurrentContextError extends Error {
   constructor() {
     super();
-    this.message = 'You are trying to delete a context that is currently in use.';
+    this.message = messages.DELETING_CURRENT_CONTEXT;
   }
 }
 
 export class MissingCurrentContextError extends Error {
   constructor() {
     super();
-    this.message = 'No context is set as current, please set a current context.';
+    this.message = messages.MISSING_CURRENT_CONTEXT;
   }
 }
 
 export class MissingArgumentstError extends Error {
   constructor() {
     super();
-    this.message = 'Missing arguments';
+    this.message = messages.MISSING_ARGUMENTS;
   }
 }

src/messages.tsx

@@ -0,0 +1,78 @@
+export const NO_CONTEXTS_SAVED = 'No contexts saved yet, run asyncapi --help to know more';
+
+export const CONTEXT_NOT_FOUND = 'This context key does not exists.';
+
+export const KEY_NOT_FOUND = 'Key not found';
+
+export const DELETING_CURRENT_CONTEXT = 'You are tyring to delete a context that is currently in use.';
+
+export const MISSING_CURRENT_CONTEXT = 'No context is set as current, please set a current context.';
+
+export const MISSING_ARGUMENTS = 'Missing arguments.';
+
+export interface CommandHelp {
+  name: string,
+  usage: string,
+  shortDescription?: string,
+  longDescription?: string,
+  flags?: string[],
+  commands?: string[]
+}
+
+export class Help {
+  private _helpFlag = '-h, --help  display help for command';
+  private root: CommandHelp = {
+    name: 'root',
+    usage: 'asyncapi [options] [command]',
+    flags: [
+      this._helpFlag,
+      '-v, -version  output the version number'
+    ]
+  }
+
+  private validate: CommandHelp = {
+    name: 'validate',
+    usage: 'asyncapi validate [options]',
+    shortDescription: 'Validate an asyncapi file',
+    flags: [
+      '-f, --file <spec-file-path>  Path of the spec file',
+      '-c, --context <saved-context-name>  Context name to use',
+      '-w, --watch  watch mode',
+      this._helpFlag
+    ]
+  }
+
+  private context: CommandHelp = {
+    name: 'context',
+    usage: 'asyncapi context [options] [command]',
+    shortDescription: 'Manage contexts',
+    flags: [
+      this._helpFlag
+    ],
+    commands: [
+      'list  list all saved contexts',
+      'current  see current context',
+      'use <context-name>  set a context as current',
+      'add <context-name> <spec-file-path>  add/update context',
+      'remove <context-name>  remove a context'
+    ]
+  }
+
+  rootHelp(): string {
+    let helpString = '';
+    helpString += `usage: ${this.root.usage}\n\n`;
+    helpString += 'options:\n';
+    if (this.root.flags) {
+      for (const flag of this.root.flags) {
+        helpString += ` ${flag} \n`;
+      }
+    }
+
+    helpString += '\n';
+
+    helpString += 'commads:\n';
+    helpString += ` context [options] [command]  ${this.context.shortDescription} \n`;
+    helpString += ` validate [options]  ${this.validate.shortDescription}\n`;
+    return helpString;
+  }
+}