[gcc/devel/rust/master] Add script to generate gource

[gcc/devel/rust/master] Add script to generate gource

[Thomas Schwinge]

https://gcc.gnu.org/g:854281e251d298099542a9209c0021e225850f86

commit 854281e251d298099542a9209c0021e225850f86
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Thu Dec 9 16:30:43 2021 +0000

    Add script to generate gource
    
    This script tries to isolate our changes to GCC minus the changes to
    gcc/config so that we can visualize our development history.

Diff:
---
 gcc/rust/gource-gccrs.sh | 129 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)

diff --git a/gcc/rust/gource-gccrs.sh b/gcc/rust/gource-gccrs.sh
new file mode 100755
index 00000000000..f14a2e52c6e
--- /dev/null
+++ b/gcc/rust/gource-gccrs.sh
@@ -0,0 +1,129 @@
+#!/usr/bin/env bash
+set -e
+
+usage() { echo "Usage: $0 [-o output.mp4] [-r 1600x1080]" 1>&2; }
+
+RESOLUTION="1600x1080"
+output=""
+while getopts ho:r: flag; do
+    case "${flag}" in
+        o)
+            output=${OPTARG}
+            ;;
+        r)
+            RESOLUTION=${OPTARG}
+            ;;
+        h)
+            usage
+            exit 0
+            ;;
+        *)
+            usage
+            exit 1
+            ;;
+    esac
+done
+
+# we require gource and ffmpeg to generate this stuff
+if ! [ -x "$(command -v git)" ]; then
+  echo 'Error: git is not installed.' >&2
+  exit 1
+fi
+if ! [ -x "$(command -v gource)" ]; then
+  echo 'Error: gource is not installed.' >&2
+  exit 1
+fi
+if ! [ -x "$(command -v ffmpeg)" ]; then
+  echo 'Error: ffmpeg is not installed.' >&2
+  exit 1
+fi
+
+# are we in the root of the repo?
+if [ ! -d ".git" ]; then
+    echo ".git directory not found, this script must be run at root repo"
+    exit 1
+fi
+
+# if the output already exists then we should stop
+if test -f "$output"; then
+    echo "$output already exists."
+    exit 1
+fi
+
+# check if .ppm exists
+if test -f "gource.ppm"; then
+    echo "gource.ppm already exists."
+    exit 1
+fi
+
+# is cargo-gccrs here?
+if [ ! -d "cargo-gccrs" ]; then
+    git clone git@github.com:Rust-GCC/cargo-gccrs.git
+fi
+
+# get the log file for cargo gccrs
+pushd cargo-gccrs
+rm -f cargo.log
+gource --output-custom-log cargo.log .
+sed -i -E "s#(.+)\|#\1|/cargo#" cargo.log
+mv cargo.log ../
+popd
+
+# generate the log file for gccrs
+git log --pretty=format:user:%aN%n%ct \
+    --reverse \
+    --raw \
+    --encoding=UTF-8 \
+    --no-renames \
+    --no-show-signature \
+    -- \
+    .github \
+    Dockerfile \
+    *.md \
+    gcc/rust \
+    gcc/testsuite/rust \
+    gcc/testsuite/rust.test > gccrs-raw.log
+gource --log-format git --output-custom-log gccrs.log - < gccrs-raw.log
+rm -f gccrs-raw.log
+
+# combine them
+combined_log="$(mktemp /tmp/gource.XXXXXX)"
+cat cargo.log gccrs.log | sort -n > "$combined_log"
+rm -f gccrs.log
+rm -f cargo.log
+
+echo "Committers:"
+awk -F\| {'print  $2'} < "$combined_log"| sort | uniq
+echo "======================"
+
+GOURCE_RESOLUTION_ARG="-$RESOLUTION"
+GOURCE_OUTPUT_ARGS=""
+if [ -n "$output" ]; then
+    GOURCE_OUTPUT_ARGS="--output-ppm-stream gource.ppm"
+fi
+
+# actually generate the gource
+gource "$combined_log" \
+       --title "GCC Rust" \
+       -s 0.4 \
+       -i 0 \
+       "$GOURCE_RESOLUTION_ARG" \
+       --highlight-users \
+       --highlight-dirs \
+       --file-extensions \
+       --hide mouse \
+       --key \
+       --stop-at-end \
+       "$GOURCE_OUTPUT_ARGS"
+
+# cleanup the log
+rm -f "$combined_log"
+
+# transcode it
+if [ -n "$output" ]; then
+    # this seems to encode at a high quality but ends up being many gb in size
+    ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i gource.ppm -vcodec libx264 -preset ultrafast -pix_fmt yuv420p -crf 1 -threads 0 -bf 0 "$output"
+fi
+
+echo "crabby on film: $output"
+echo "(\/)(º～º)(\/)"