Simplify multiple path support in go plugin (#1284)

* simplify wrapped pathmunge logic. update tests to account for cases with spaces in $PATH.

plugins/available/go.plugin.bash

@@ -3,27 +3,17 @@
 cite about-plugin
 about-plugin 'go environment variables & path configuration'
 
-[ ! command -v go &>/dev/null ] && return
+command -v go &>/dev/null || return
 
-function _split_path_reverse() {
-  local a=( ${@//:/ } )
+function _go_pathmunge_wrap() {
+  IFS=':' local -a 'a=($1)'
   local i=${#a[@]}
-  local r=
   while [ $i -gt 0 ] ; do
     i=$(( i - 1 ))
-    if [ $(( i + 1 )) -eq ${#a[@]} ] ; then
-      r="${a[i]}"
-    else
-      r="${r} ${a[i]}"
-    fi
+    pathmunge "${a[i]}/bin"
   done
-  echo "$r"
 }
 
-export GOROOT=${GOROOT:-$(go env GOROOT)}
-pathmunge "${GOROOT}/bin"
-
-export GOPATH=${GOPATH:-$(go env GOPATH)}
-for p in $( _split_path_reverse ${GOPATH} ) ; do
-  pathmunge "${p}/bin"
-done
+export GOROOT="${GOROOT:-$(go env GOROOT)}"
+export GOPATH="${GOPATH:-$(go env GOPATH)}"
+_go_pathmunge_wrap "${GOPATH}:${GOROOT}"

test/plugins/go.plugin.bats

@@ -1,44 +1,53 @@
 #!/usr/bin/env bats
 
-#load ../test_helper
+load ../test_helper
 load ../../lib/helpers
 load ../../lib/composure
-load ../../plugins/available/go.plugin
 
-@test 'plugins go: reverse path: single entry' {
-  run _split_path_reverse '/foo'
-  echo "output = ${output}"
-  [ "$output" = "/foo" ]
-}
-
-@test 'plugins go: reverse path: single entry, colon empty' {
-  run _split_path_reverse '/foo:'
-  echo "output = ${output}"
-  [ "$output" = "/foo" ]
-}
-
-@test 'plugins go: reverse path: single entry, colon whitespace' {
-  run _split_path_reverse '/foo: '
-  echo "output = ${output}"
-  [ "$output" = "/foo" ]
-}
-
-@test 'plugins go: reverse path: multiple entries' {
-  run _split_path_reverse '/foo:/bar'
-  echo "output = ${output}"
-  [ "$output" = "/bar /foo" ]
+@test 'ensure _go_pathmunge_wrap is defined' {
+  load ../../plugins/available/go.plugin
+  run type -t _go_pathmunge_wrap
+  assert_line 'function'
 }
 
 @test 'plugins go: single entry in GOPATH' {
   export GOPATH="/foo"
+  export GOROOT="/baz"
   load ../../plugins/available/go.plugin
-  echo "$(echo $PATH | cut -d':' -f1,2)"
-  [ "$(echo $PATH | cut -d':' -f1)" = "/foo/bin" ]
+  assert_equal "$(cut -d':' -f1,2 <<<$PATH)" "/foo/bin:/baz/bin"
+}
+
+@test 'plugins go: single entry in GOPATH, with space' {
+  export GOPATH="/foo bar"
+  export GOROOT="/baz"
+  load ../../plugins/available/go.plugin
+  assert_equal "$(cut -d':' -f1,2 <<<$PATH)" "/foo bar/bin:/baz/bin"
+}
+
+@test 'plugins go: single entry in GOPATH, with escaped space' {
+  export GOPATH="/foo\ bar"
+  export GOROOT="/baz"
+  load ../../plugins/available/go.plugin
+  assert_equal "$(cut -d':' -f1,2 <<<$PATH)" "/foo\ bar/bin:/baz/bin"
 }
 
 @test 'plugins go: multiple entries in GOPATH' {
   export GOPATH="/foo:/bar"
+  export GOROOT="/baz"
   load ../../plugins/available/go.plugin
-  echo "$(echo $PATH | cut -d':' -f1,2)"
-  [ "$(echo $PATH | cut -d':' -f1,2)" = "/foo/bin:/bar/bin" ]
+  assert_equal "$(cut -d':' -f1,2,3 <<<$PATH)" "/foo/bin:/bar/bin:/baz/bin"
+}
+
+@test 'plugins go: multiple entries in GOPATH, with space' {
+  export GOPATH="/foo:/foo bar"
+  export GOROOT="/baz"
+  load ../../plugins/available/go.plugin
+  assert_equal "$(cut -d':' -f1,2,3 <<<$PATH)" "/foo/bin:/foo bar/bin:/baz/bin"
+}
+
+@test 'plugins go: multiple entries in GOPATH, with escaped space' {
+  export GOPATH="/foo:/foo\ bar"
+  export GOROOT="/baz"
+  load ../../plugins/available/go.plugin
+  assert_equal "$(cut -d':' -f1,2,3 <<<$PATH)" "/foo/bin:/foo\ bar/bin:/baz/bin"
 }