Update

Convert-ppt-to-pdf.applescript

@@ -1,26 +1,26 @@
 on run {input, parameters}
-    set theOutput to {}
-    tell application "Microsoft PowerPoint" -- work on version 15.15 or newer
-        launch
-        set theDial to start up dialog
-        set start up dialog to false
-        repeat with i in input
-            open i
-            set pdfPath to my makeNewPath(i)
-            save active presentation in pdfPath as save as PDF -- save in same folder
-            close active presentation saving no
-            set end of theOutput to pdfPath as alias
-        end repeat
-        set start up dialog to theDial
-    end tell
-    return theOutput
+	set theOutput to {}
+	tell application "Microsoft PowerPoint" -- work on version 15.15 or newer
+		launch
+		set theDial to start up dialog
+		set start up dialog to false
+		repeat with i in input
+			open i
+			set pdfPath to my makeNewPath(i)
+			save active presentation in pdfPath as save as PDF -- save in same folder
+			close active presentation saving no
+			set end of theOutput to pdfPath as alias
+		end repeat
+		set start up dialog to theDial
+	end tell
+	return theOutput
 end run
 
 on makeNewPath(f)
-    set t to f as string
-    if t ends with ".pptx" then
-        return (text 1 thru -5 of t) & "pdf"
-    else
-        return t & ".pdf"
-    end if
-end makeNewPath
+	set t to f as string
+	if t ends with ".pptx" then
+		return (text 1 thru -5 of t) & "pdf"
+	else
+		return (text 1 thru -4 of t) & "pdf"
+	end if
+end makeNewPath

Readme.md

@@ -12,7 +12,7 @@ This repository provides AppleScript that could convert doc/ppt to pdf using aut
 
 运行时需要提供访问权限。
 
-Open Automator on OS X, choosing a new workflow.
+Open Automator on OS X, and new a workflow.
 
 Choosing "Get Finder items", add files. ("Filter Finder items" can help filter given file format, like doc/docx/ppt/pptx)