1 files changed, 135 insertions, 0 deletions
diff --git a/preflight.sh b/preflight.sh
new file mode 100755
index 0000000..f3b75f8
--- /dev/null
+++ b/preflight.sh
@@ -0,0 +1,135 @@
+#!/bin/sh
+
+set -e
+
+color() {
+  fg="$1"
+  bg="${2}"
+  ft="${3:-0}"
+
+  printf "\33[%s;%s;%s" "$ft" "$fg" "$bg"
+}
+
+color_reset() {
+  printf "\033[0m"
+}
+
+ok() {
+  if [ -t 1 ]; then
+    printf "%s[ OK ]%s\n" "$(color 37 42m 1)" "$(color_reset)"
+  else
+    printf "%s\n" "[ OK ]"
+  fi
+}
+
+err() {
+  if [ -t 1 ]; then
+    printf "%s[ ERR ]%s\n" "$(color 37 41m 1)" "$(color_reset)"
+  else
+    printf "%s\n" "[ ERR ]"
+  fi
+}
+
+run() {
+  retval=0
+  logfile="$(mktemp -t "run-XXXXXX")"
+  if "$@" 2> "$logfile"; then
+    ok
+  else
+    retval=$?
+    err
+    cat "$logfile" || true
+  fi
+  rm -rf "$logfile"
+  return $retval
+}
+
+progress() {
+  printf "%-40s" "$(printf "%s ... " "$1")"
+}
+
+log() {
+  printf "%s\n" "$1"
+}
+
+log2() {
+  printf "%s\n" "$1" 1>&2
+}
+
+error() {
+  log "ERROR: ${1}"
+}
+
+fail() {
+  log "FATAL: ${1}"
+  exit 1
+}
+
+check_goversion() {
+  progress "Checking Go version"
+
+  if ! command -v go > /dev/null 2>&1; then
+    log2 "Cannot find the Go compiler"
+    return 1
+  fi
+
+  gover="$(go version | grep -o -E 'go[0-9]+\.[0-9]+(\.[0-9]+)?')"
+
+  if ! go version | grep -E 'go1\.1[78](\.[0-9]+)?' > /dev/null; then
+    log2 "Go 1.17+ is required, found ${gover}"
+    return 1
+  fi
+
+  return 0
+}
+
+check_path() {
+  progress "Checking \$PATH"
+
+  gobin="$(eval "$(go env | grep GOBIN)")"
+  gopath="$(eval "$(go env | grep GOPATH)")"
+
+  if [ -n "$gobin" ] && ! echo "$PATH" | grep "$gobin" > /dev/null; then
+    log2 "\$GOBIN '$gobin' is not in your \$PATH"
+    return 1
+  fi
+
+  if [ -n "$gopath" ] && ! echo "$PATH" | grep "$gopath/bin" > /dev/null; then
+    log2 "\$GOPATH/bin '$gopath/bin' is not in your \$PATH"
+    return 1
+  fi
+
+  if ! echo "$PATH" | grep "$HOME/go/bin" > /dev/null; then
+    log2 "\$HOME/go/bin is not in your \$PATH"
+    return 1
+  fi
+
+  return 0
+}
+
+check_deps() {
+  progress "Checking deps"
+
+  if ! command -v ffmpeg > /dev/null 2>&1; then
+    log2 "ffmpeg not found, Please install it using your OS package manager"
+    return 1
+  fi
+
+  return 0
+}
+
+steps="check_goversion check_path check_deps"
+
+_main() {
+  for step in $steps; do
+    if ! run "$step"; then
+      fail "🙁 preflight failed"
+    fi
+  done
+
+  log "🥳 All Done! Ready to build, run: make build"
+}
+
+if [ -n "$0" ] && [ x"$0" != x"-bash" ]; then
+  _main "$@"
+fi