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meson: avoid regenerating hb-version.h unnecessarily 

The file is a dependency for the library as a whole, so previously editing the Meson build files at all would force a full rebuild. This will only rebuild it if the version has changed.
This commit is contained in:
Ryan 2020-12-23 02:31:03 -05:00 committed by Behdad Esfahbod
parent ea4476d738
commit 769a21aab6
1 changed files with 10 additions and 1 deletions
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11
src/gen-hb-version.py
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@ -2,7 +2,7 @@
"This tool is intended to be used from meson" "This tool is intended to be used from meson"
import os, sys, shutil import os, sys, shutil, re
if len (sys.argv) < 4: if len (sys.argv) < 4:
sys.exit(__doc__) sys.exit(__doc__)
@ -14,6 +14,15 @@ OUTPUT = sys.argv[2]
INPUT = sys.argv[3] INPUT = sys.argv[3]
CURRENT_SOURCE_DIR = os.path.dirname(INPUT) CURRENT_SOURCE_DIR = os.path.dirname(INPUT)
try:
with open (OUTPUT, "r") as old_output:
for line in old_output:
old_version = re.match (r"#define HB_VERSION_STRING \"(\d.\d.\d)\"", line)
if old_version and old_version[1] == version:
sys.exit ()
except IOError:
pass
with open (INPUT, "r", encoding='utf-8') as template: with open (INPUT, "r", encoding='utf-8') as template:
with open (OUTPUT, "wb") as output: with open (OUTPUT, "wb") as output:
output.write (template.read () output.write (template.read ()