add setenv.sh

It contains functions to automatically format PGN files as I would like.

5 files changed, 540 insertions, 2 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..d76765e
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+* text=auto
+
+*.sh text eol=lf
diff --git a/LICENSE-CC-BY.txt b/LICENSE-CC-BY.txt
new file mode 100644
index 0000000..2f244ac
--- /dev/null
+++ b/LICENSE-CC-BY.txt
@@ -0,0 +1,395 @@
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diff --git a/LICENSE-MIT.txt b/LICENSE-MIT.txt
new file mode 100644
index 0000000..22f89cc
--- /dev/null
+++ b/LICENSE-MIT.txt
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
index 6f31bbf..7aaa270 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,14 @@ analyzing in case one's a good student.
 License
 -------
 
-The annotations are available under a [Creative Commons Attribution 4.0
-International License][CC BY 4.0].
+This project, including all of the files and their contents, is licensed under
+the terms of the MIT License.
+See [LICENSE-MIT.txt] for details.
 
+In addition, the annotations in *.pgn files are dual-licensed under the
+[Creative Commons Attribution 4.0 International License][CC BY 4.0].
+See [LICENSE-CC-BY.txt] for details.
+
+[LICENSE-MIT.txt]: LICENSE-MIT.txt
+[LICENSE-CC-BY.txt]: LICENSE-CC-BY.txt
 [CC BY 4.0]: https://creativecommons.org/licenses/by/4.0/
diff --git a/setenv.sh b/setenv.sh
new file mode 100644
index 0000000..befb4e5
--- /dev/null
+++ b/setenv.sh
@@ -0,0 +1,112 @@
+#!/usr/bin/env bash
+
+# Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+# Utility functions and aliases for "prettifying" PGN files (mostly those
+# downloaded from Chess.com).
+
+# You can use the functions and aliases from this file by "sourcing" it in
+# `bash` (other shells might work as well):
+#
+#     > source setenv.sh
+#
+# `bash` 4.3.42, distributed by the Cygwin project, has been verified to work
+# properly.
+# The dependencies, along with their respective versions that were verified to
+# work properly (also provided by the Cygwin project), are
+#
+# * `coreutils` 8.25,
+# * `sed` 4.2.2.
+#
+# Any Cygwin installation must already have the corresponding packages
+# installed.
+
+# I consider a PGN file to be "pretty" if it
+#
+# 1. has Windows-style newlines (\r\n),
+# 2. places the main line moves on separates lines,
+# 3. doesn't have [%clk] tags after the moves, as those are redundant for
+# storage and analysis (at least that's my opinion currently).
+#
+# The list above is highly subjective of course.
+
+# A word of warning: be very careful when trying to apply the routines from
+# this file to your PGNs, as the result might be disastrous if a PGN is
+# formatted in an unexpected way.
+# You definitely should backup the files prior to trying to "prettify" them.
+#
+# Those precautions aside, if you do want to format PGNs downloaded from
+# Chess.com in a manner I described above, call the `normalize_pgn` function
+# by passing the paths to the PGN files you want to "prettify".
+# For example,
+#
+#     > normalize_pgns Kasparov_vs_Karpov.pgn MyCrushingWin.pgn
+#
+# You can also compress a bunch of PGNs into a single PGN file:
+#
+#     > join_pgns Kasparov_vs_Karpov.pgn MyCrushingWin.pgn > MemorableGames.pgn
+#
+# Or you might want to add a game from a PGN file to a database of games:
+#
+#     > append_pgn MemorableGames.pgn MyCrushingDefeat.pgn
+
+# "Lints" PGN files.
+# Each PGN
+#
+# * has its Unix-style newlines (\n) replaced by Windows-style newlines (\r\n),
+# * gets whitespace characters trimmed from the end of each line,
+# * gets trailing newlines trimmed from the end of the file,
+# * gets a single newline (\r\n) appended at the end of the file.
+lint_pgn() {
+
+    sed --binary --in-place 's/\r\?$/\r/' "$@" \
+        && sed --binary --in-place 's/[[:blank:]]*\(\r\?\)$/\1/' "$@" \
+        && sed --binary --in-place -e :a -e '/^\(\r\n\)*\r$/{$d;N;ba}' "$@" \
+        && sed --binary --in-place '$s/\r\?$/\r/;a\' "$@"
+}
+
+# Strips [%clk] tags from PGN files.
+alias strip_pgn_clk='sed --binary --in-place '"'"'s/ {\[%clk [[:digit:]]\+:[[:digit:]]\+\(:[[:digit:]]\+\)*\]}//g'"'"
+
+# Places main line moves at separate lines.
+alias slice_pgn_moves='sed --binary --in-place '"'"'s/ \([[:digit:]]\+\.\)/\r\n\1/g'"'"
+
+# "Prettifies" PGN files by (see above)
+#
+# * "linting" them,
+# * stripping [%clk] tags,
+# * placing main line moves at separate lines.
+normalize_pgn() {
+    lint_pgn "$@" \
+        && strip_pgn_clk "$@" \
+        && slice_pgn_moves "$@"
+}
+
+append_pgn() {
+    if [ "$#" -ne 2 ]; then
+        echo "usage: $FUNCNAME DEST_PGN SRC_PGN" >&2
+        return 1
+    fi
+
+    printf '\r\n' >> "$1" \
+        && cat "$2" >> "$1"
+}
+
+join_pgns() (
+    if [ "$#" -eq 0 ]; then
+        echo "usage: $FUNCNAME [PGN_FILE]"
+        return 0
+    fi
+
+    set -o errexit
+
+    cat "$1"
+
+    local i
+    for i in "${@:2}"; do
+        printf '\r\n'
+        cat "$i"
+    done
+)