Optionally choose the go version from go.mod

.testdata/go.mod

@@ -0,0 +1,3 @@
+module githib.com/travis-ci/gimme/testdata
+
+go 1.17

.testdata/source-darwin

@@ -1,5 +1,6 @@
 tip
 stable
+module
 master
 go1.4rc1
 1.5rc1

.testdata/source-linux

@@ -1,5 +1,6 @@
 tip
 stable
+module
 master
 go1.4rc1
 1.5rc1

.travis.yml

@@ -18,6 +18,7 @@ env:
   - PATH="${HOME}/bin:${PATH}"
   - SHELLCHECK_URL="https://www.googleapis.com/download/storage/v1/b/shellcheck/o/shellcheck-v0.4.7.linux.x86_64.tar.xz?alt=media"
   - SHFMT_URL="https://github.com/mvdan/sh/releases/download/v2.2.0/shfmt_v2.2.0_linux_amd64"
+  - GIMME_MODULE_PREFIX='.testdata/'
   matrix:
   - TARGET=native GO_VERSIONS="$(sed -n -e '/^[^#]/p' < .testdata/sample-binary-$UNAME) $(sed -n -e '/^[^#]/p' < .testdata/source-$UNAME)"
   - TARGET=arm GO_VERSIONS="master"

README.md

@@ -82,6 +82,12 @@ To install the previous minor release of Go:
 gimme oldstable
 ```
 
+To install the most recent patch of relase specified in the go.mod file:
+
+```
+gimme module
+```
+
 Or to install and use the development version (master branch) of Go:
 
 ``` bash

gimme

@@ -44,6 +44,7 @@
 #+     GIMME_DOWNLOAD_BASE - override base URL dir for download (default '${GIMME_DOWNLOAD_BASE}')
 #+        GIMME_LIST_KNOWN - override base URL for known go versions (default '${GIMME_LIST_KNOWN}')
 #+   GIMME_KNOWN_CACHE_MAX - seconds the cache for --known is valid for (default '${GIMME_KNOWN_CACHE_MAX}')
+#+     GIMME_MODULE_PREFIX - directory prefix for go.mod file in 'module' mode (default './')
 #+  -
 #
 set -e
@@ -597,6 +598,10 @@ _resolve_version() {
 		echo "tip"
 		return 0
 		;;
+	module)
+		_get_module
+		return 0
+		;;
 	*.x)
 		true
 		;;
@@ -691,6 +696,16 @@ _last_mod_timestamp() {
 	esac
 }
 
+_get_module() {
+	if [[ ! -f "${GIMME_MODULE_PREFIX}go.mod" ]]; then
+		die 'not a module'
+	fi
+	if ! grep '^go' "${GIMME_MODULE_PREFIX}go.mod" >/dev/null; then
+		die 'module has no go directive'
+	fi
+	_resolve_version "$(grep '^go' "${GIMME_MODULE_PREFIX}go.mod" | awk '{ print $2 }').x"
+}
+
 _file_older_than_secs() {
 	local file="${1}"
 	local age_secs="${2}"
@@ -903,6 +918,7 @@ esac
 case "${GIMME_GO_VERSION}" in
 stable) GIMME_GO_VERSION=$(_get_curr_stable) ;;
 oldstable) GIMME_GO_VERSION=$(_get_old_stable) ;;
+module) GIMME_GO_VERSION=$(_resolve_version module) ;;
 esac
 
 _assert_version_given "$@"