Improve command not found error message

CHANGELOG.md

@@ -1,7 +1,8 @@
 # Next
+- Improve command not found error message
 - Add goimports beautifier for Go language
-- ...
 - Fixes [#1728](https://github.com/Glavin001/atom-beautify/issues/1728). Remove Shell-Env from Executable, use Atom's process.env instead. See [#1735](https://github.com/Glavin001/atom-beautify/pull/1735).
+- ...
 
 # v0.30.2 (2017-06-20)
 - Fixes [#1030](https://github.com/Glavin001/atom-beautify/issues/1030). Add support for alpha versions of autopep8

spec/atom-beautify-spec.coffee

@@ -78,8 +78,11 @@ describe "Atom-Beautify", ->
             expect(v).not.toBe(null)
             expect(v instanceof Error).toBe(true)
             expect(v.code).toBe("CommandNotFound")
-            expect(v.description).toBe(undefined, \
-              'Error should not have a description.')
+            expect(typeof v.description).toBe("string", \
+              'Error should have a description.')
+            expect(v.description
+              .indexOf("Executable - Beautifier - Path")).toBe(-1, \
+              "Error should not have pathOption.")
             return v
           p.then(cb, cb)
           return p

src/beautifiers/beautifier.coffee

@@ -187,6 +187,11 @@ module.exports = class Beautifier
       installation: @link
       cmd: executable
     })
+    help ?= {
+      program: executable
+      link: @link
+      pathOption: undefined
+    }
     exe.run(args, {cwd, ignoreReturnCode, help, onStdin})
 
   ###

src/beautifiers/executable.coffee

@@ -134,6 +134,11 @@ class Executable
     { cmd, cwd, ignoreReturnCode, help, onStdin, returnStderr, returnStdoutOrStderr } = options
     exeName = cmd or @cmd
     cwd ?= os.tmpDir()
+    help ?= {
+      program: @cmd
+      link: @installation or @homepage
+      pathOption: "Executable - #{@name or @cmd} - Path"
+    }
 
     # Resolve executable and all args
     Promise.all([@shellEnv(), this.resolveArgs(args)])
@@ -276,45 +281,22 @@ class Executable
     if help?
       if typeof help is "object"
         # Basic notice
-        helpStr = "See #{help.link} for program \
-                            installation instructions.\n"
-        # Help to configure Atom Beautify for program's path
+        docsLink = "https://github.com/Glavin001/atom-beautify#beautifiers"
+        helpStr = "See #{exe} installation instructions at #{docsLink}#{if help.link then (' or go to '+help.link) else ''}\n"
+        # # Help to configure Atom Beautify for program's path
         helpStr += "You can configure Atom Beautify \
                     with the absolute path \
                     to '#{help.program or exe}' by setting \
                     '#{help.pathOption}' in \
                     the Atom Beautify package settings.\n" if help.pathOption
-        # Optional, additional help
-        helpStr += help.additional if help.additional
-        # Common Help
-        issueSearchLink =
-          "https://github.com/Glavin001/atom-beautify/\
-                  search?q=#{exe}&type=Issues"
-        docsLink = "https://github.com/Glavin001/\
-                  atom-beautify/tree/master/docs"
         helpStr += "Your program is properly installed if running \
                             '#{if @isWindows() then 'where.exe' \
                             else 'which'} #{exe}' \
                             in your #{if @isWindows() then 'CMD prompt' \
                             else 'Terminal'} \
-                            returns an absolute path to the executable. \
-                            If this does not work then you have not \
-                            installed the program correctly and so \
-                            Atom Beautify will not find the program. \
-                            Atom Beautify requires that the program be \
-                            found in your PATH environment variable. \n\
-                            Note that this is not an Atom Beautify issue \
-                            if beautification does not work and the above \
-                            command also does not work: this is expected \
-                            behaviour, since you have not properly installed \
-                            your program. Please properly setup the program \
-                            and search through existing Atom Beautify issues \
-                            before creating a new issue. \
-                            See #{issueSearchLink} for related Issues and \
-                            #{docsLink} for documentation. \
-                            If you are still unable to resolve this issue on \
-                            your own then please create a new issue and \
-                            ask for help.\n"
+                            returns an absolute path to the executable.\n"
+        # # Optional, additional help
+        helpStr += help.additional if help.additional
         er.description = helpStr
       else #if typeof help is "string"
         er.description = help