1 files changed, 77 insertions, 0 deletions
diff --git a/configure.py b/configure.py
new file mode 100755
index 0000000..291ce68
--- /dev/null
+++ b/configure.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+
+import os
+import re
+import shlex
+import shutil
+import subprocess
+from sys import stderr
+
+cmds = {}
+
+class CheckError(Exception):
+    pass
+
+def checking(thing):
+    stderr.write("checking %s... " % thing)
+    stderr.flush()
+
+def check(name, flags=[], optional=False, var=None, run=True):
+    checking("for %s" % name)
+    var = var or name.upper()
+    split = shlex.split(os.getenv(var) or name)
+    exe = shutil.which(split[0])
+    if not exe:
+        stderr.write("not found\n")
+        if not optional:
+            raise CheckError()
+    stderr.write("%s\n" % exe)
+    cmd = [exe] + split[1:] + flags + shlex.split(os.getenv(var + "FLAGS") or "")
+    if run:
+        checking("%s usability" % exe)
+        try:
+            subprocess.check_call(cmd + ["-h"], stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
+            stderr.write("yes\n")
+        except subprocess.CalledProcessError as e:
+            raise CheckError() from e
+
+    cmds[var] = cmd
+    return cmd
+
+def run_ffmpeg(arg):
+    return subprocess.check_output(ffmpeg + [arg], stderr=subprocess.STDOUT).decode('utf-8')
+
+def ffmpeg_check(name, regex, checks, output):
+    for check in checks:
+        checking("if %s supports %s %s" % (ffmpeg[0], name, check))
+
+        if re.search("\n %s %s " % (regex, check), output):
+            stderr.write("yes\n")
+        else:
+            stderr.write("no\n")
+            raise CheckError()
+
+try:
+    check("zopfli", var="GZIP")
+except CheckError:
+    check("gzip", ["-9"])
+
+check("apngasm", run=False)
+check("convert")
+check("cwebp", ["-quiet", "-alpha_cleanup", "-m", "6"])
+ffmpeg = check("ffmpeg", ["-v", "warning", "-y"], run=False)
+ffmpeg_formats = run_ffmpeg("-formats")
+ffmpeg_check("demuxing", "D.", ["matroska,webm", "ogg", "wav", "yuv4mpegpipe"], ffmpeg_formats)
+ffmpeg_check("muxing", ".E", ["ipod", "mp4", "ogg", "wav", "webm", "yuv4mpegpipe"], ffmpeg_formats)
+ffmpeg_check("decoding", ".{6}", ["mpeg4", "rawvideo", "pcm_s16le", "vorbis"], run_ffmpeg("-decoders"))
+ffmpeg_check("encoding", ".{6}", ["libx264", "rawvideo", "libtheora", "libvpx", "libvpx-vp9", "libfdk_aac", "libopus", "pcm_s16le"], run_ffmpeg("-encoders"))
+check("npm", ["--quiet"])
+check("webpmux")
+check("defluff", optional=True, run=False)
+check("pngquant", optional=True)
+check("zopflipng", optional=True)
+
+stderr.write("creating Makefile.inc\n")
+
+with open("Makefile.inc", "w") as f:
+    f.write(''.join('%s := %s\n' % (k, subprocess.list2cmdline(cmds[k])) for k in cmds))