go.mod: declare goimports as a tool, for use in cover.sh

Add 'goimports' (the command) as a tool:
   $ go get -tool golang.org/x/tools/cmd/goimports@v0.38.0

Now we can use it for testing the -goimports option from cover.sh via
'go tool goimports' and its version is aligned with the package.

Author: dolmen

cover.sh

@@ -8,11 +8,6 @@ go=go
 goeval=./goeval.cover
 goeval_offline=./goeval-offline.cover
 
-if ! command -v goimports >/dev/null; then
-        echo "goimports: command not found." >&2
-        exit 1
-fi
-
 if [[ ! -d "$GOCOVERDIR" ]]; then
         mkdir -p "$GOCOVERDIR"
 else
@@ -26,6 +21,11 @@ echo Building...
 $go build -covermode=set -coverpkg=./... -buildvcs=true -o=$goeval .
 $go build -covermode=set -coverpkg=./... -buildvcs=true -tags=goeval.offline -o=$goeval_offline .
 
+# Ensure that goimports (declared as tool in go.mod) is built
+$go tool goimports -h >/dev/null || :
+# Show goimports version
+$go version -m $($go tool -n goimports)
+
 export GOCOVERDIR
 
 echo Running tests...
@@ -67,7 +67,8 @@ $goeval -goimports=goimports -E 'fmt.Println("Hello, world")'
 $goeval -goimports= -E 'fmt.Println("Hello, world")'
 
 # With goimports as external command
-$goeval -goimports="$(command -v goimports)" -E 'fmt.Println("Hello, world")'
+# We are using the one declared as a tool in go.mod
+$goeval -goimports="$($go tool -n goimports)" -E 'fmt.Println("Hello, world")'
 
 
 # GOPATH mode with external package

go.mod

@@ -7,6 +7,13 @@ require (
 	golang.org/x/tools v0.38.0
 )
 
-require golang.org/x/sync v0.17.0 // indirect
+require (
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	golang.org/x/telemetry v0.0.0-20251008203120-078029d740a8 // indirect
+)
 
-tool github.com/dolmen-go/goeval
+tool (
+	github.com/dolmen-go/goeval
+	golang.org/x/tools/cmd/goimports
+)

go.sum

@@ -4,5 +4,9 @@ golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
 golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
 golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
 golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/telemetry v0.0.0-20251008203120-078029d740a8 h1:LvzTn0GQhWuvKH/kVRS3R3bVAsdQWI7hvfLHGgh9+lU=
+golang.org/x/telemetry v0.0.0-20251008203120-078029d740a8/go.mod h1:Pi4ztBfryZoJEkyFTI5/Ocsu2jXyDr6iSdgJiYE/uwE=
 golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
 golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=