Add copyright acknowledgements

Dockerfile

@@ -17,6 +17,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         autoconf \
         m4 \
         gperf \
+        licensecheck \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /code

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2017 JavascriptSubtitlesOctopus contributors
+Copyright (c) 2017-2021 JavascriptSubtitlesOctopus contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Makefile

@@ -326,16 +326,49 @@ dist/js/subtitles-octopus-worker-legacy.js: src/subtitles-octopus-worker.bc src/
 		-s LEGACY_VM_SUPPORT=1 \
 		$(EMCC_COMMON_ARGS)
 
-dist/js/subtitles-octopus.js: src/subtitles-octopus.js
+dist/js/subtitles-octopus.js: dist/license/all src/subtitles-octopus.js
 	mkdir -p dist/js
-	cp src/subtitles-octopus.js dist/js/
+	awk '1 {print "// "$$0}' dist/license/all | cat - src/subtitles-octopus.js > $@
+
+LIB_LICENSES := brotli expat freetype fribidi fontconfig harfbuzz libass
+LIB_LICENSES_FINDOPT_brotli   := -path ./research -prune -false -o ! -path ./js/decode.min.js
+LIB_LICENSES_FINDOPT_expat    := -path ./expat/fuzz -prune -false -o
+LIB_LICENSES_FINDOPT_freetype := -path ./src/tools -prune -false -o
+LIB_LICENSES_FINDOPT_fribidi  := -path ./bin -prune -false -o
+LIB_LICENSES_FINDOPT_harfbuzz := -path ./test -prune -false -o
+
+$(addprefix dist/license/, $(LIB_LICENSES)): dist/license/%: .git/modules/lib/%/HEAD build/license_extract.sh build/license_defaults
+	@mkdir -p dist/license
+	(cd "lib/$*" && FINDOPTS="$(LIB_LICENSES_FINDOPT_$*)" \
+	 ../../build/license_extract.sh ../../build/license_defaults "$*"  .) > $@
+
+dist/license/subtitlesoctopus: .git/HEAD build/license_extract.sh
+	@mkdir -p dist/license
+	build/license_extract.sh build/license_defaults subtitlesoctopus src > dist/license/subtitlesoctopus
+
+dist/license/all: dist/license/subtitlesoctopus $(addprefix dist/license/, $(LIB_LICENSES)) build/license_fullnotice build/license_lint.awk
+	@echo "# The following lists all copyright notices and licenses for the" >  dist/license/all
+	@echo "# work contained in JavascriptSubtitlesOctopus per project."      >> dist/license/all
+	@echo "" >> dist/license/all
+
+	@echo "Concatenate extracted license info..."
+	@$(foreach LIB_PROJ, subtitlesoctopus $(LIB_LICENSES), \
+		echo "# Project: $(LIB_PROJ)"  >> dist/license/all && \
+		cat  dist/license/$(LIB_PROJ)  >> dist/license/all && \
+	) :
+
+	mv dist/license/all dist/license/all.tmp
+	build/license_lint.awk dist/license/all.tmp build/license_fullnotice
+	cat dist/license/all.tmp build/license_fullnotice > dist/license/all
 
 # Clean Tasks
 
 clean: clean-dist clean-libs clean-octopus
 
 clean-dist:
-	cd dist && rm -frv ./libraries/* && rm -frv ./js/*
+	rm -frv dist/libraries/*
+	rm -frv dist/js/*
+	rm -frv dist/license/*
 clean-libs:
 	rm -frv dist/libraries build/lib
 clean-octopus:

build/license_defaults

@@ -0,0 +1,12 @@
+# Tab seperated list of default license
+# and if given copyrightholder per project
+subtitlesoctopus	Expat			2017-2021 JavascriptSubtitlesOctopus contributors
+
+brotli				Expat			2009, 2010, 2013-2016 by the Brotli Authors
+expat				Expat			2000-2017 Expat development team / 1997-2000 Thai Open Source Software Center Ltd
+libass				ISC				2006-2016 libass contributors
+fontconfig			NTP~disclaimer	2000-2007 Keith Packard / 2005 Patrick Lam / 2009 Roozbeh Pournader / 2008,2009 Red Hat, Inc. / 2008 Danilo Šegan / 2012 Google, Inc.
+
+fribidi				LGPL-2.1+
+harfbuzz			MIT~old
+freetype			FTL

build/license_extract.sh

@@ -0,0 +1,95 @@
+#!/bin/sh
+
+# Copyright 2021 Oneric
+# SPDX-License-Identifier: ISC
+
+# Postprocesses the output of licensecheck to automatically
+# generate our distribution notice.
+# licensecheck is packaged in Debian and its derivatives
+# and can be obtained from CPAN everywhere.
+
+usage() {
+    echo "$0 <map file> <project name> <dir>" >&2
+    exit 1
+}
+
+set -eu
+
+FINDOPTS="${FINDOPTS:-}"
+tabulator="$(printf '\t')"
+
+if [ "$#" -ne 3 ] || [ ! -e "$3" ] \
+        || [ ! -e "$1" ] || [ -d "$1" ] ; then
+    usage
+fi
+
+def_license="$(awk 'BEGIN{FS="\t+"} /^'"$2"'/ {print $2" | "$3}' "$1")"
+def_copy="${def_license#* | }"
+def_license="${def_license%% | *}"
+base_dir="$3"
+
+if [ -z "$def_license" ] || [ "$def_license" = "$def_copy" ] ; then
+    echo "The map file appears to be borked or entry is missing!" >&2
+    exit 1
+fi
+
+find "$base_dir" $FINDOPTS -type f -regextype egrep -regex '.*\.(c|h|cpp|hpp|js)$' -exec \
+    licensecheck --machine --copyright --deb-fmt '{}' \; \
+    | awk -F"$tabulator" -v base_dir="$base_dir" \
+        -v def_license="$def_license" -v def_copy="$def_copy" '
+            BEGIN {
+                split("", lcfiles)     # Clear array with only pre-Issue 8 POSIX
+                SUBSEP = sprintf("\n") # Seperator for pseudo-multidim arrays
+
+                # Add default
+                if(def_copy && def_license)
+                    ++lcfiles[def_license, def_copy]
+            }
+
+            1 {
+                if ($2 == "UNKNOWN")
+                    if (def_license) {
+                        $2 = def_license
+                    }else {
+                        print "ERROR: Unlicensed file "$1" matched!" | "cat>&2"
+                        print "             If there is no default license, then" | "cat>&2"
+                        print "             reporting this upstream might be a good idea." | "cat>&2"
+                        exit 1
+                    }
+                if ($3 == "*No copyright*") {
+                    if (def_copy) {
+                        $3 = def_copy
+                    } else if (def_license != $2) {
+                        print "ERROR: Orphaned file "$1" and no default attribution!" | "cat>&2"
+                        exit 1
+                    } else {
+                        # Appears eg in freetype ; hope default copyright holder is correct
+                        next
+                    }
+                }
+
+                split($3, copyh, " / ")
+                for(i in copyh)
+                    ++lcfiles[$2, copyh[i]];
+            }
+
+            END {
+                # Group copyright holders per license
+                # The second pass in END is required to only add each (license, copy) pair once
+                # using pure POSIX-only awk.
+                split("", tmp)
+                for(lc in lcfiles) {
+                    split(lc, lico, SUBSEP)
+                    if(lico[1] in tmp)
+                        tmp[lico[1]] = tmp[lico[1]]""SUBSEP"  "lico[2]
+                    else
+                        tmp[lico[1]] = lico[2]
+                }
+
+                for(license in tmp) {
+                    printf "License: %s\n", license
+                    printf "Copyright: %s\n", tmp[license]
+                    printf "\n"
+                }
+            }
+        '