Set up continuous delivery with CircleCI.

- All successful CircleCI builds save a copy of the JAR in the CircleCI
  artifacts system.
- Successful builds on master trigger a GitHub release which tags the
  relevant revision with the version number and saves a copy of the JAR
  in the releases section of the GitHub project page.

Author: conormcd

circle.yml

@@ -0,0 +1,5 @@
+deployment:
+  all:
+    branch: /.*/
+    commands:
+      - bash release.sh

release.sh

@@ -0,0 +1,129 @@
+#!/bin/bash
+
+set -o nounset
+
+export GITHUB_USER=conormcd
+export GITHUB_REPO=clj-libssh2
+
+current_version() {
+  grep -m1 '(defproject' project.clj | \
+    sed -e 's,^.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*$,\1,'
+}
+
+major() {
+  current_version | cut -d. -f1
+}
+
+minor() {
+  current_version | cut -d. -f2
+}
+
+patch() {
+  if [ -n "${CIRCLE_BUILD_NUM:-}" ]; then
+    echo "${CIRCLE_BUILD_NUM}"
+  else
+    current_version | cut -d. -f3
+  fi
+}
+
+branch() {
+  if [ -n "${CIRCLE_BRANCH:-}" ]; then
+    echo "${CIRCLE_BRANCH}"
+  else
+    git rev-parse --abbrev-ref HEAD
+  fi
+}
+
+sha() {
+  if [ -n "${CIRCLE_SHA1:-}" ]; then
+    echo "${CIRCLE_SHA1}"
+  else
+    git rev-parse HEAD
+  fi
+}
+
+sha_short() {
+  sha | sed -e 's,^\(........\).*,\1,'
+}
+
+new_version() {
+  if [ "$(branch)" != "master" ]; then
+    echo "$(major).$(minor).$(patch)-$(branch)-$(sha_short)"
+  else
+    echo "$(major).$(minor).$(patch)"
+  fi
+}
+
+sed_inplace() {
+  if sed --help 2>&1 | grep -q -m 1 GNU; then
+    sed -i -e "$@"
+  else
+    sed -i '' -e "$@"
+  fi
+}
+
+update_project_clj() {
+  local _v=$1
+  echo "Updating project.clj to version ${_v}"
+  sed_inplace "s,\((defproject clj-libssh2 \)\"[^\"]*\",\1\"${_v}\"," project.clj
+}
+
+build_jars() {
+  echo "Building JARs..."
+  lein jar 2>&1 | sed -e 's,^,  ,'
+}
+
+save_artifacts() {
+  if [ -n "${CIRCLE_ARTIFACTS:-}" ]; then
+    echo "Copying JARs to CircleCI artifacts..."
+    find . -name '*.jar' -exec cp {} "${CIRCLE_ARTIFACTS}" \;
+  fi
+}
+
+ensure_github_release_tool_installed() {
+  local _cwd
+  _cwd=$(pwd)
+
+  if [ -z "${GOPATH:-}" ]; then
+    export GOPATH=${_cwd}/.go
+  fi
+  export PATH="${PATH}:${GOPATH}/bin"
+  if ! which github-release > /dev/null 2>&1; then
+    echo "Installing github-release..."
+    go get github.com/aktau/github-release
+  fi
+}
+
+github_release() {
+  local _version
+  _version=$1
+
+  echo "Releasing ${_version}"
+  github-release release \
+    --user "${GITHUB_USER}" \
+    --repo "${GITHUB_REPO}" \
+    --tag "${_version}" \
+    --target "$(sha)" \
+    --description "Release version ${_version}"
+  find . -name '*.jar' | while read -r _jar; do
+    github-release upload \
+      --user "${GITHUB_USER}" \
+      --repo "${GITHUB_REPO}" \
+      --tag "${_version}" \
+      --name "$(basename "${_jar}")" \
+      --file "${_jar}"
+  done
+}
+
+v=$(new_version)
+update_project_clj "${v}"
+build_jars
+save_artifacts
+if [ "$(branch)" = "master" ]; then
+  # TODO: Make the lack of a GitHub token fatal.
+  if [ -n "${GITHUB_TOKEN:-}" ]; then
+    ensure_github_release_tool_installed
+    github_release "${v}"
+  fi
+  # TODO: Push to clojars
+fi