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blockreplace.py
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devtools
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blockreplace.py
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#!/usr/bin/env python3
# A rather simple script to replace a block of text, delimited by
# markers, with new contents from stdin. Importantly the markers are
# left in the file so future runs can update the file without
# requiring a separate template. The markers are currently for
# reStructuredText only, but more can be added.
from
enum
import
Enum
import
argparse
import
os
import
sys
import
textwrap
class
Language
(
str
,
Enum
):
md
=
'md'
rst
=
'rst'
c
=
'c'
yml
=
'yml'
comment_style
=
{
Language
.
md
: (
"<!-- block_start {blockname} -->"
,
"<!-- block_end {blockname} -->"
,
),
Language
.
rst
: (
".. block_start {blockname}"
,
".. block_end {blockname}"
,
),
Language
.
c
: (
"/* block_start {blockname} */"
,
"/* block_end {blockname} */"
,
),
Language
.
yml
: (
"# block_start {blockname}"
,
"# block_end {blockname}"
,
),
}
def
replace
(
filename
,
blockname
,
language
,
content
):
start
,
stop
=
comment_style
[
language
]
tempfile
=
f"
{
filename
}
.tmp"
with
open
(
filename
,
'r'
)
as
i
,
open
(
tempfile
,
'w'
)
as
o
:
lines
=
i
.
readlines
()
# Read lines up to the marker
while
lines
!=
[]:
l
=
lines
.
pop
(
0
)
o
.
write
(
l
)
if
l
.
strip
()
==
start
.
format
(
blockname
=
blockname
):
break
o
.
write
(
content
)
# Skip lines until we get the end marker
while
lines
!=
[]:
l
=
lines
.
pop
(
0
)
if
l
.
strip
()
==
stop
.
format
(
blockname
=
blockname
):
o
.
write
(
l
)
break
# Now flush the rest of the file
for
l
in
lines
:
o
.
write
(
l
)
# Move the temp file over the old one for an atomic replacement
os
.
rename
(
tempfile
,
filename
)
def
main
(
args
):
parser
=
argparse
.
ArgumentParser
(
prog
=
'blockreplace'
)
parser
.
add_argument
(
'filename'
)
parser
.
add_argument
(
'blockname'
)
parser
.
add_argument
(
'--language'
,
type
=
Language
)
parser
.
add_argument
(
'--indent'
,
dest
=
"indent"
,
default
=
""
)
args
=
parser
.
parse_args
()
content
=
sys
.
stdin
.
read
()
content
=
textwrap
.
indent
(
content
,
args
.
indent
)
replace
(
args
.
filename
,
args
.
blockname
,
args
.
language
,
content
)
if
__name__
==
"__main__"
:
main
(
sys
.
argv
)
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