114 lines
4.4 KiB
Python
114 lines
4.4 KiB
Python
#!/usr/bin/env python3
|
|
|
|
import os, sys, json, traceback, subprocess
|
|
|
|
# Definitions
|
|
def stdout(string, end='\n', flush=False):
|
|
print(string, end=end, file=sys.stdout, flush=flush)
|
|
|
|
def stderr(string, end='\n', flush=False):
|
|
print(string, end=end, file=sys.stderr, flush=flush)
|
|
|
|
exit_codes = {
|
|
"normal exit": 0,
|
|
"wrong usage": 1,
|
|
"error while processing": 2
|
|
}
|
|
|
|
stderr("\nVariable Grabbler - version 5.0\n--------------------------------------------------------------------------------")
|
|
################################################################################
|
|
# Chnages in this version:
|
|
# - complete rewrite in Python 3
|
|
# - output to stdout instead of rewriting the file
|
|
#===============================================================================
|
|
# Full documentation: tbd
|
|
#===============================================================================
|
|
|
|
# Command line input handling
|
|
usage = "Usage: python3 "+sys.argv[0]+" <macro config file> <file to be processed>"
|
|
if not len(sys.argv)==3:
|
|
stderr("E: Wrong amount of arguments.")
|
|
stderr(usage)
|
|
sys.exit(exit_codes["wrong usage"])
|
|
if sys.argv[1] == sys.argv[2]:
|
|
stderr("E: Both input files are the same.")
|
|
stderr(usage)
|
|
sys.exit(exit_codes["wrong usage"])
|
|
|
|
# load macros into a dict
|
|
stderr("I: Reading macro definitions... ")
|
|
macros = {}
|
|
try:
|
|
if os.path.isfile(sys.argv[1]):
|
|
macro_file = open(sys.argv[1], "r")
|
|
macros = json.loads(macro_file.read())
|
|
macro_file.close()
|
|
elif sys.argv[1] == '-':
|
|
macros = json.loads(sys.stdin.read())
|
|
else:
|
|
stderr("E: Not a valid file: "+sys.argv[1])
|
|
sys.exit(exit_codes["error while processing"])
|
|
except:
|
|
stderr("E: An exception occurred while trying to read macro definitions:")
|
|
traceback.print_exc()
|
|
sys.exit(exit_codes["error while processing"])
|
|
|
|
# process "file" and "exec" macros
|
|
stderr("I: Loading templates and processing commands...")
|
|
for macro in macros:
|
|
if macros[macro][0] == "file":
|
|
if os.path.isfile(macros[macro][1]):
|
|
try:
|
|
stderr("I: Loading template: " + macro)
|
|
template = open(macros[macro][1], "r")
|
|
macros[macro] = template.read()
|
|
template.close()
|
|
except:
|
|
stderr("E: An exception occurred while trying to read the template:")
|
|
traceback.print_exc()
|
|
sys.exit(exit_codes["error while processing"])
|
|
else:
|
|
stderr("E: Macro \"" + macro + "\": template \"" + macros[macro][1] + "\" is not a valid file.")
|
|
sys.exit(exit_codes["error while processing"])
|
|
elif macros[macro][0] == "exec":
|
|
try:
|
|
stderr("I: Running command: " + macro)
|
|
process = subprocess.Popen(macros[macro][1], shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
process_stdout, process_stderr = process.communicate()
|
|
macros[macro] = process_stdout.decode("utf-8")
|
|
if len(process_stderr) > 0:
|
|
stderr("Output on stderr:\n"+process_stderr)
|
|
if not process.returncode == 0:
|
|
stderr("E: Command execution failed with exit code "+str(process.returncode))
|
|
sys.exit(exit_codes["error while processing"])
|
|
except:
|
|
stderr("E: An exception occurred while trying to process the command:")
|
|
traceback.print_exc()
|
|
sys.exit(exit_codes["error while processing"])
|
|
|
|
# open file to be processed and iterate over it
|
|
stderr("I: Preparing to process input file...")
|
|
try:
|
|
input_file = sys.stdin
|
|
if os.path.isfile(sys.argv[2]):
|
|
input_file = open(sys.argv[2], "r")
|
|
elif sys.argv[2] == '-':
|
|
# nothing to do here bc input_file is already set to sys.stdin
|
|
pass
|
|
else:
|
|
stderr("E: Not a valid file: "+sys.argv[2])
|
|
sys.exit(exit_codes["error while processing"])
|
|
# make the magic happen
|
|
stderr("I: Processing input file...")
|
|
for line in input_file:
|
|
for macro in macros:
|
|
line = line.replace("%" + macro + "%", str(macros[macro]))
|
|
stdout(line, end="")
|
|
# close input file if it's not sys.stdin, assume sys.stdin is being handled for us
|
|
if not input_file==sys.stdin:
|
|
input_file.close()
|
|
except:
|
|
stderr("E: An exception occured while processing " + input_file.name + ":")
|
|
traceback.print_exc()
|
|
sys.exit(exit_codes["error while processing"])
|