Added function to check pre-requisites and checks for Windows

constants.py

@@ -1,5 +1,7 @@
 DEFAULT_OUTPUT_DIRECTORY_NAME = "converted-text"
+
 DEFAULT_CHECK_COMMAND = "which"
 WINDOWS_CHECK_COMMAND = "where"
+TESSERACT_DATA_PATH_VAR = 'TESSDATA_PREFIX'
 
 VALID_IMAGE_EXTENSIONS = [".jpg", ".jpeg", ".gif", ".png", ".tga", ".tif", ".bmp"]

main.py

@@ -5,7 +5,7 @@
 import sys
 
 from constants import DEFAULT_OUTPUT_DIRECTORY_NAME, VALID_IMAGE_EXTENSIONS, WINDOWS_CHECK_COMMAND, \
-    DEFAULT_CHECK_COMMAND
+    DEFAULT_CHECK_COMMAND, TESSERACT_DATA_PATH_VAR
 
 
 def create_directory(path):
@@ -37,16 +37,51 @@ def get_command():
     return DEFAULT_CHECK_COMMAND
 
 
-def main(input_path, output_path):
-    # Check if tesseract is installed or not
+def check_pre_requisites_tesseract():
+    """
+    Check if the pre-requisites required for running the tesseract application are satisfied or not
+    :param : NA
+    :return: boolean
+    """
     check_command = get_command()
     logging.debug("Running `{}` to check if tesseract is installed or not.".format(check_command))
     result = subprocess.run([check_command, 'tesseract'], stdout=subprocess.PIPE)
     if not result.stdout:
         logging.error("tesseract-ocr missing, use install `tesseract` to resolve.")
-        return
+        return False
     logging.debug("Tesseract correctly installed!\n")
 
+    if sys.platform.startswith('win'):
+        environment_variables = os.environ
+        logging.debug("Checking if the Tesseract Data path is set correctly or not.\n")
+        if TESSERACT_DATA_PATH_VAR in environment_variables:
+            if environment_variables[TESSERACT_DATA_PATH_VAR]:
+                path = environment_variables[TESSERACT_DATA_PATH_VAR]
+                logging.debug("Checking if the path configured for Tesseract Data Environment variable `{}` \
+                as `{}` is valid or not.".format(TESSERACT_DATA_PATH_VAR, path))
+                if os.path.isdir(path) and os.access(path, os.R_OK):
+                    logging.debug("All set to go!")
+                    return True
+                else:
+                    logging.error("Configured path for Tesseract data is not accessible!")
+                    return False
+            else:
+                logging.error("Tesseract Data path Environment variable '{}' configured to an empty string!\
+                ".format(TESSERACT_DATA_PATH_VAR))
+                return False
+        else:
+            logging.error("Tesseract Data path Environment variable '{}' needs to be configured to point to\
+            the tessdata!".format(TESSERACT_DATA_PATH_VAR))
+            return False
+    else:
+        return True
+
+
+def main(input_path, output_path):
+    # Check if tesseract is installed or not
+    if not check_pre_requisites_tesseract():
+        return
+
     # Check if a valid input directory is given or not
     if not check_path(input_path):
         logging.error("No directory found at `{}`".format(input_path))