mod: drop support for go 1.17

A lot of libraries are starting to use generics (introduced in go 1.18).
Restricting aerc on 1.17 prevents us from updating our dependencies.
Since 1.18 is a major milestone, it has a chance to remain supported for
a while.

Update the minimum go version to 1.18. Run go mod tidy -compat=1.18.
Update our CI to run on 1.18.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Bence Ferdinandy <bence@ferdinandy.com>

6 files changed, 6 insertions, 16 deletions

diff --git a/.builds/alpine-edge.yml b/.builds/alpine-edge.yml
index bc63b35d..0f097c53 100644
--- a/.builds/alpine-edge.yml
+++ b/.builds/alpine-edge.yml
@@ -29,8 +29,8 @@ tasks:
       cd aerc
       go test ./...
   - ancient-go-version: |
-      curl -O https://dl-cdn.alpinelinux.org/alpine/v3.15/community/x86_64/go-1.17.10-r0.apk
-      sudo apk add ./go-1.17.10-r0.apk
+      curl -O https://dl-cdn.alpinelinux.org/alpine/v3.16/community/x86_64/go-1.18.7-r0.apk
+      sudo apk add ./go-1.18.7-r0.apk
       cd aerc
       make clean
       make
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 538f9dd4..352deed8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,7 +44,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - `[ui].index-format` setting has been replaced by `index-columns`.
 - `[statusline].render-format` has been replaced by `status-columns`.
-- Removed support for go < 1.17.
+- Removed support for go < 1.18.
 - Removed support for `[ui:subject...]` contextual sections in `aerc.conf`.
 - `[triggers]` setting has been replaced by `[hooks]`.
 - `smtp-starttls` setting in `accounts.conf` has been removed. All `smtp://`
diff --git a/README.md b/README.md
index 32ac5a4e..bf3f1e11 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ And likely other platforms.
 
 Install the dependencies:
 
-- go (>=1.17) *(Go versions are supported until their end-of-life; support for
+- go (>=1.18) *(Go versions are supported until their end-of-life; support for
   older versions may be dropped at any time due to incompatibilities or newer
   required language features.)*
 - [scdoc](https://git.sr.ht/~sircmpwn/scdoc)
diff --git a/go.mod b/go.mod
index 0c5af1a6..bae6cdb0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module git.sr.ht/~rjarry/aerc
 
-go 1.17
+go 1.18
 
 require (
 	git.sr.ht/~rockorager/tcell-term v0.7.0
diff --git a/go.sum b/go.sum
index 37aa2168..aa779449 100644
--- a/go.sum
+++ b/go.sum
@@ -377,9 +377,6 @@ golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220823224334-20c2bfdbfe24/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
diff --git a/lib/crypto/gpg/gpg_test.go b/lib/crypto/gpg/gpg_test.go
index e34cc2bb..25d73693 100644
--- a/lib/crypto/gpg/gpg_test.go
+++ b/lib/crypto/gpg/gpg_test.go
@@ -3,7 +3,6 @@ package gpg
 import (
 	"bytes"
 	"io"
-	"os"
 	"os/exec"
 	"strings"
 	"testing"
@@ -17,13 +16,7 @@ func initGPGtest(t *testing.T) {
 	}
 	// temp dir is automatically deleted by the test runtime
 	dir := t.TempDir()
-	// t.Setenv is only available since go 1.17
-	if err := os.Setenv("GNUPGHOME", dir); err != nil {
-		t.Fatalf("failed to set GNUPGHOME: %s", err)
-	}
-	t.Cleanup(func() {
-		os.Unsetenv("GNUPGHOME")
-	})
+	t.Setenv("GNUPGHOME", dir)
 	t.Logf("using GNUPGHOME = %s", dir)
 }