upstream/mercurial-mirror Files · tests/heredoctest.py

posix: always seek to EOF when opening a file in append mode...

posix: always seek to EOF when opening a file in append mode Python 3 already does this, so skip it there. Consider the program: #include <stdio.h> int main() { FILE *f = fopen("narf", "w"); fprintf(f, "narf\n"); fclose(f); f = fopen("narf", "a"); printf("%ld\n", ftell(f)); fprintf(f, "troz\n"); printf("%ld\n", ftell(f)); return 0; } on macOS, FreeBSD, and Linux with glibc, this program prints 5 10 but on musl libc (Alpine Linux and probably others) this prints 0 10 By my reading of https://pubs.opengroup.org/onlinepubs/009695399/functions/fopen.html this is technically correct, specifically: > Opening a file with append mode (a as the first character in the > mode argument) shall cause all subsequent writes to the file to be > forced to the then current end-of-file, regardless of intervening > calls to fseek(). in other words, the file position doesn't really matter in append-mode files, and we can't depend on it being at all meaningful unless we perform a seek() before tell() after open(..., 'a'). Experimentally after a .write() we can do a .tell() and it'll always be reasonable, but I'm unclear from reading the specification if that's a smart thing to rely on. This matches what we do on Windows and what Python 3 does for free, so let's just be consistent. Thanks to Yuya for the idea.

Yuya Nishihara - - Load All Authors

File last commit:

r40354:55fd0fef default


                r42778:97ada9b8

5.0.2 stable

Download file

             heredoctest.py
        
                    27 lines
            
             | 646 B
            
                | text/x-python
            
             |
                PythonLexer
            
             / tests / heredoctest.py
          
                    History
                
                 |
                  Source
                 | Raw
                 |Copy content
                 |Copy permalink

        Pulkit Goyal
    
py3: make files use absolute_import and print_function...

              r29485
            
      from __future__ import absolute_import, print_function

        Gregory Szorc
    
tests: use absolute_import for heredoctest.py

              r27297
            
        Matt Mackall
    
run-tests: replace inline python handling with more native scheme...

              r15434
            
      import sys

        Idan Kamara
    
tests: remove temp doctest file when finished running it

              r15247
            
        Yuya Nishihara
    
py3: flush std streams before/after running user code in heredoctest.py...

              r40354
            
      def flush():

          sys.stdout.flush()

          sys.stderr.flush()

        Matt Mackall
    
run-tests: replace inline python handling with more native scheme...

              r15434
            
      globalvars = {}

      lines = sys.stdin.readlines()

      while lines:

          l = lines.pop(0)

          if l.startswith('SALT'):

        Augie Fackler
    
heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py

              r25032
            
              print(l[:-1])

        Matt Mackall
    
run-tests: replace inline python handling with more native scheme...

              r15434
            
          elif l.startswith('>>> '):

              snippet = l[4:]

              while lines and lines[0].startswith('... '):

                  l = lines.pop(0)

        Yuya Nishihara
    
heredoctest: do not append extra newline character to continuation line...

              r22565
            
                  snippet += l[4:]

        Matt Mackall
    
run-tests: replace inline python handling with more native scheme...

              r15434
            
              c = compile(snippet, '<heredoc>', 'single')

              try:

        Yuya Nishihara
    
py3: flush std streams before/after running user code in heredoctest.py...

              r40354
            
                  flush()

        Augie Fackler
    
heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py

              r25032
            
                  exec(c, globalvars)

        Yuya Nishihara
    
py3: flush std streams before/after running user code in heredoctest.py...

              r40354
            
                  flush()

        Augie Fackler
    
heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py

              r25032
            
              except Exception as inst:

        Yuya Nishihara
    
py3: flush std streams before/after running user code in heredoctest.py...

              r40354
            
                  flush()

        Augie Fackler
    
heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py

              r25032
            
                  print(repr(inst))

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

Pulkit Goyal py3: make files use absolute_import and print_function...	r29485	from __future__ import absolute_import, print_function
Gregory Szorc tests: use absolute_import for heredoctest.py	r27297
Matt Mackall run-tests: replace inline python handling with more native scheme...	r15434	import sys
Idan Kamara tests: remove temp doctest file when finished running it	r15247
Yuya Nishihara py3: flush std streams before/after running user code in heredoctest.py...	r40354	def flush():
		sys.stdout.flush()
		sys.stderr.flush()

Matt Mackall run-tests: replace inline python handling with more native scheme...	r15434	globalvars = {}
		lines = sys.stdin.readlines()
		while lines:
		l = lines.pop(0)
		if l.startswith('SALT'):
Augie Fackler heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py	r25032	print(l[:-1])
Matt Mackall run-tests: replace inline python handling with more native scheme...	r15434	elif l.startswith('>>> '):
		snippet = l[4:]
		while lines and lines[0].startswith('... '):
		l = lines.pop(0)
Yuya Nishihara heredoctest: do not append extra newline character to continuation line...	r22565	snippet += l[4:]
Matt Mackall run-tests: replace inline python handling with more native scheme...	r15434	c = compile(snippet, '<heredoc>', 'single')
		try:
Yuya Nishihara py3: flush std streams before/after running user code in heredoctest.py...	r40354	flush()
Augie Fackler heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py	r25032	exec(c, globalvars)
Yuya Nishihara py3: flush std streams before/after running user code in heredoctest.py...	r40354	flush()
Augie Fackler heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py	r25032	except Exception as inst:
Yuya Nishihara py3: flush std streams before/after running user code in heredoctest.py...	r40354	flush()
Augie Fackler heredoctest: 2to3 -w -f numliterals -f except -f print tests/heredoctest.py	r25032	print(repr(inst))