old_contents: #!/usr/bin/env python3
  
  import io
  import pexpect
  import string
  import sys
  import time
  
  output_to=sys.stdout
  
  args = list(sys.argv[1:])
  logfile = open(args.pop(0), "w")
  child = pexpect.spawn(' '.join(args))
  
  def output_line(line_bits, last_skip):
    line = "".join(line_bits)
    sline = line.strip()
  
    skip = True
    if line.startswith(" ") and not sline.startswith('/'):
      skip = False
  
    if "da es fi" in sline:
      skip = True
    if "setting rpath" in sline:
      skip = True
  
    if "Entering directory" in sline:
      skip = False
      sline = sline.split('make')[-1]
  
    if len(sline) > 1:
      if sline[0] in string.ascii_uppercase and sline[1] not in string.ascii_uppercase:
        skip = False
      if sline[0] in ('[', '=', '!', '+'):
        skip = False
  
    if skip != last_skip:
      output_to.write('\n')
  
    if skip:
      output_to.write('.')
    else:
      output_to.write(line)
  
    output_to.flush()
    line_bits.clear()
    return skip
  
  
  def find_newline(data):
    fulldata = b"".join(data)
    newlinechar = fulldata.find(b'\n')
    retlinechar = fulldata.find(b'\r')
  
    if newlinechar == -1:
      newlinechar = len(fulldata)+1
    if retlinechar == -1:
      retlinechar = len(fulldata)+1
  
    if retlinechar+1 == newlinechar:
      splitpos = newlinechar
    else:
      splitpos = min(newlinechar, retlinechar)
  
    if splitpos > len(fulldata):
      return
  
    newline = fulldata[:splitpos+1]
    leftover = fulldata[splitpos+1:]
  
    data.clear()
    data.append(leftover)
    return newline
  
  
  last_skip = False
  cont = []
  data = [b'']
  while True:
    line = None
    while len(data) > 1 or len(data[0]) > 0 or child.isalive():
      line = find_newline(data)
      if line is not None:
        break
      try:
        data.append(child.read_nonblocking(100))
      except pexpect.TIMEOUT:
        pass
      except pexpect.EOF as e:
        data.append(b'\n')
  
    if not line:
      break
  
    line = line.decode('utf-8')
    logfile.write(line)
    logfile.flush()
  
    if line.endswith('\r'):
      cont.append(line[:-1])
      last_skip = output_line(cont, last_skip)
      cont.append('\r')
      continue
  
    sline = line.strip('\n\r')
    cont.append(sline)
    if sline.endswith('\\'):
      continue
  
    cont.append('\n')
    last_skip = output_line(cont, last_skip)
  
  sys.exit(child.exitstatus)
  
new_contents: #!/usr/bin/env python3
  
  import io
  import pexpect
  import re
  import string
  import sys
  import time
  
  output_to=sys.stdout
  
  args = list(sys.argv[1:])
  logfile = open(args.pop(0), "w")
  child = pexpect.spawn(' '.join(args))
  
  def output_line(line_bits, last_skip):
    line = "".join(line_bits)
    line = re.sub("/really.*/conda/", "/.../conda/", line)
    sline = line.strip()
  
    skip = True
    if line.startswith(" ") and not sline.startswith('/'):
      skip = False
  
    if "da es fi" in sline:
      skip = True
    if "setting rpath" in sline:
      skip = True
  
    if "Entering directory" in sline:
      skip = False
      sline = sline.split('make')[-1]
  
    if len(sline) > 1:
      if sline[0] in string.ascii_uppercase and sline[1] not in string.ascii_uppercase:
        skip = False
      if sline[0] in ('[', '=', '!', '+'):
        skip = False
  
    if skip != last_skip:
      output_to.write('\n')
  
    if skip:
      output_to.write('.')
    else:
      output_to.write(line)
  
    output_to.flush()
    line_bits.clear()
    return skip
  
  
  def find_newline(data):
    fulldata = b"".join(data)
    newlinechar = fulldata.find(b'\n')
    retlinechar = fulldata.find(b'\r')
  
    if newlinechar == -1:
      newlinechar = len(fulldata)+1
    if retlinechar == -1:
      retlinechar = len(fulldata)+1
  
    if retlinechar+1 == newlinechar:
      splitpos = newlinechar
    else:
      splitpos = min(newlinechar, retlinechar)
  
    if splitpos > len(fulldata):
      return
  
    newline = fulldata[:splitpos+1]
    leftover = fulldata[splitpos+1:]
  
    data.clear()
    data.append(leftover)
    return newline
  
  
  last_skip = False
  cont = []
  data = [b'']
  while True:
    line = None
    while len(data) > 1 or len(data[0]) > 0 or child.isalive():
      line = find_newline(data)
      if line is not None:
        break
      try:
        data.append(child.read_nonblocking(100))
      except pexpect.TIMEOUT:
        pass
      except pexpect.EOF as e:
        data.append(b'\n')
  
    if not line:
      break
  
    line = line.decode('utf-8')
    logfile.write(line)
    logfile.flush()
  
    if line.endswith('\r'):
      cont.append(line[:-1])
      last_skip = output_line(cont, last_skip)
      cont.append('\r')
      continue
  
    sline = line.strip('\n\r')
    cont.append(sline)
    if sline.endswith('\\'):
      continue
  
    cont.append('\n')
    last_skip = output_line(cont, last_skip)
  
  sys.exit(child.exitstatus)
  
subject: Remove the very long line output.