lint,validate: fix for openbsd

- Remove GNU specific stuff (ln -v, mktemp --tempdir, grep --color)
- Remove GCC specific flags in sendemail-validate (-Warith-conversion)
- Add -std=c99 and -Wpedantic and fix the reported warnings.
- Explicitly call gmake everywhere.
- Run our custom analyzer standalone. Golangci lint plugins are not
  supported on OpenBSD. Indirect dependency to golang.org/x/mod is
  required somehow...

Reported-by: Johannes Thyssen Tishman <johannes@thyssentishman.com>
Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Johannes Thyssen Tishman <johannes@thyssentishman.com>

14 files changed, 74 insertions, 63 deletions

diff --git a/.builds/alpine-edge.yml b/.builds/alpine-edge.yml
index 5edd26a5..c8892ccb 100644
--- a/.builds/alpine-edge.yml
+++ b/.builds/alpine-edge.yml
@@ -12,20 +12,20 @@ environment:
   DESTDIR: ./out
   GOFLAGS: "-tags=notmuch"
   CC: gcc
-  CFLAGS: -O2 -g -Wall -Wextra -Wconversion -Warith-conversion -Werror -Wformat-security -Wstack-protector -fstack-protector-strong -fanalyzer
+  CFLAGS: -O0 -g -std=c99 -Wall -Wextra -Wconversion -Werror -Wformat-security -Wstack-protector -Wpedantic -Wmissing-prototypes
   FILTERS_TEST_PREFIX: valgrind --leak-check=full --error-exitcode=1
 tasks:
   - build: |
-      make -C aerc
+      gmake -C aerc
   - install: |
-      make -C aerc install checkinstall
+      gmake -C aerc install checkinstall
   - test: |
-      make -C aerc tests
+      gmake -C aerc tests
   - lint: |
-      make -C aerc lint
+      gmake -C aerc lint
   - ancient-go-version: |
       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
-      make -C aerc clean all
+      gmake -C aerc clean all
   - check-patches: |
-      make -C aerc check-patches
+      gmake -C aerc check-patches
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index a541c713..ee89b9c3 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
       - run: brew install gnupg notmuch scdoc
-      - run: make
-      - run: make install
-      - run: make checkinstall
+      - run: gmake
+      - run: gmake install
+      - run: gmake checkinstall
       - run: go test ./...
diff --git a/.golangci.toml b/.golangci.toml
index 543f142a..14c99d40 100644
--- a/.golangci.toml
+++ b/.golangci.toml
@@ -9,15 +9,9 @@ enable = [
 	"errorlint", # check to ensure no problems with wrapped errors
 	"gocritic", # check for bugs, performance, and style issues
 	"gofmt", # check that gofmt is satisfied
-	"aerc", # aerc specific linters
 ]
 
 [linters-settings.nolintlint]
 allow-unused = false # don't allow nolint if not required
 require-explanation = true # require an explanation when disabling a linter
 requre-specific = true # linter exceptions must specify the linter
-
-[linters-settings.custom.aerc]
-path = "./linters.so"
-description = "Aerc specific linters"
-original-url = "git.sr.ht/~rjarry/aerc/contrib"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0ede7657..9337a3c2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -10,7 +10,7 @@ the project:
 
     $ git clone https://git.sr.ht/~rjarry/aerc
     $ cd aerc
-    $ make
+    $ gmake
 
 Patch the code. Write some tests. Ensure that your code is properly formatted
 with `gofumpt`. Ensure that everything builds and works as expected. Ensure
@@ -19,7 +19,7 @@ that you did not break anything.
 - If applicable, update unit tests.
 - If adding a new feature, please consider adding new tests.
 - Do not forget to update the docs.
-- Run the linter using `make lint`.
+- Run the linter using `gmake lint`.
 
 Once you are happy with your work, you can create a commit (or several
 commits). Follow these general rules:
@@ -70,13 +70,14 @@ example:
 Before sending the patch, you should configure your local clone with sane
 defaults:
 
-    $ make gitconfig
+    $ gmake gitconfig
     git config format.subjectPrefix "PATCH aerc"
     git config sendemail.to "~rjarry/aerc-devel@lists.sr.ht"
     git config format.notes true
     git config notes.rewriteRef refs/notes/commits
     git config notes.rewriteMode concatenate
-    '.git/hooks/sendemail-validate' -> '../../contrib/sendemail-validate'
+    + ln -s ../../contrib/sendemail-validate .git/hooks/sendemail-validate
+    + git config sendemail.validate true
 
 And send the patch to the mailing list ([step-by-step
 instructions][git-send-email-tutorial]):
@@ -270,7 +271,7 @@ is available in the repository.
 
 The Go-code follows the rules of [gofumpt][gofumpt-repo] which is equivalent to
 gofmt but adds a few additional rules. The code can be automatically formatted
-by running `make fmt`.
+by running `gmake fmt`.
 
 If gofumpt accepts your code it's most likely properly formatted.
 
diff --git a/GNUmakefile b/GNUmakefile
index 53b55f8c..cd86c096 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -46,11 +46,8 @@ dev:
 fmt:
 	$(GO) run mvdan.cc/gofumpt@$(gofumpt_tag) -w .
 
-linters.so: contrib/linters.go
-	$(GO) build -buildmode=plugin -o linters.so contrib/linters.go
-
 .PHONY: lint
-lint: linters.so
+lint:
 	@contrib/check-whitespace `git ls-files ':!:filters/vectors'` && \
 		echo white space ok.
 	@contrib/check-docs && echo docs ok.
@@ -59,6 +56,7 @@ lint: linters.so
 		|| echo all files formatted.
 	$(GO) run github.com/golangci/golangci-lint/cmd/golangci-lint@v1.51.2 run \
 		$$(echo $(GOFLAGS) | sed s/-tags=/--build-tags=/)
+	$(GO) run $(GOFLAGS) contrib/linters.go ./...
 
 .PHONY: vulncheck
 vulncheck:
@@ -118,7 +116,8 @@ gitconfig:
 	@mkdir -p .git/hooks
 	@rm -f .git/hooks/sendemail-validate*
 	@if grep -q GIT_SENDEMAIL_FILE_COUNTER `git --exec-path`/git-send-email 2>/dev/null; then \
-		ln -svf ../../contrib/sendemail-validate .git/hooks/sendemail-validate && \
+		set -xe; \
+		ln -s ../../contrib/sendemail-validate .git/hooks/sendemail-validate && \
 		git config sendemail.validate true; \
 	fi
 
diff --git a/README.md b/README.md
index 727e8eae..cb6a6237 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ by Drew DeVault.
 
 A short demonstration can be found on [https://aerc-mail.org/](https://aerc-mail.org/)
 
-Join the IRC channel: [#aerc on irc.libera.chat](http://web.libera.chat/?channels=aerc&uio=d4)
+Join the IRC channel: [#aerc on irc.libera.chat](http://web.libera.chat/?channels=aerc)
 for end-user support, and development.
 
 ## Usage
@@ -72,11 +72,11 @@ Install the dependencies:
   older versions may be dropped at any time due to incompatibilities or newer
   required language features.)*
 - [scdoc](https://git.sr.ht/~sircmpwn/scdoc)
-- GNU make (on \*BSD, `make` commands must be replaced by `gmake`).
+- GNU make
 
 Then compile aerc:
 
-    $ make
+    $ gmake
 
 aerc optionally supports notmuch. To enable it, you need to have a recent
 version of [notmuch](https://notmuchmail.org/#index7h2), including the header
@@ -89,16 +89,16 @@ check if it is, run the following command:
 
 If it is not, you can force it before building:
 
-    $ make GOFLAGS=-tags=notmuch
+    $ gmake GOFLAGS=-tags=notmuch
 
 If you have notmuch headers available but do not want to build notmuch support
 in aerc, force GOFLAGS to an empty value:
 
-    $ make GOFLAGS=
+    $ gmake GOFLAGS=
 
 To install aerc locally:
 
-    # make install
+    # gmake install
 
 By default, aerc will install config files to directories under `/usr/local/aerc`,
 and will search for templates and stylesets in these locations in order:
@@ -112,8 +112,8 @@ At build time it is possible to add an extra location to this list and to use
 that location as the default install location for config files by setting the
 `PREFIX` option like so:
 
-    # make PREFIX=/custom/location
-    # make install PREFIX=/custom/location
+    # gmake PREFIX=/custom/location
+    # gmake install PREFIX=/custom/location
 
 This will install templates and other config files to `/custom/location/share/aerc`,
 and man pages to `/custom/location/share/man`. This extra location will have lower
diff --git a/contrib/check-docs b/contrib/check-docs
index b92ca3c0..dd783a82 100755
--- a/contrib/check-docs
+++ b/contrib/check-docs
@@ -6,14 +6,22 @@ trap "rm -f $tmp" EXIT
 global_fail=0
 
 cmd_scd_sed='s/^\*:([a-z][a-z-]*)\*.*/\1/p'
-cmd_go_sed='/^func ([[:alnum:]]\+) Aliases() \[\]string {$/{n; s/", "/ /g; s/.*return \[\]string{"\(.*\)"}/\1/p}'
+cmd_go_sed='/^func ([[:alnum:]][[:alnum:]]*) Aliases() \[\]string {$/{n;
+        s/", "/ /g;
+        s/.*return \[\]string{"\(.*\)"}/\1/p
+}'
+
+grep_color=
+if echo . | grep --color . >/dev/null 2>&1; then
+	grep_color=--color
+fi
 
 fail=0
 sed -nre "$cmd_scd_sed" doc/*.scd > "$tmp"
 for f in $(find commands -type f -name '*.go'); do
 	for cmd in $(sed -ne "$cmd_go_sed" "$f"); do
 		if ! grep -qFx "$cmd" "$tmp"; then
-			grep -HnF --color "\"$cmd\"" "$f"
+			grep -HnF $grep_color "\"$cmd\"" "$f"
 			fail=$((fail+1))
 		fi
 	done
@@ -29,7 +37,7 @@ sed -ne "$cmd_go_sed" $(find commands -type f -name '*.go') | tr ' ' '\n' > "$tm
 for f in doc/*.scd; do
 	for cmd in $(sed -nre "$cmd_scd_sed" "$f"); do
 		if ! grep -qFx "$cmd" "$tmp"; then
-			grep -Hn --color "^\\*:$cmd\\*" "$f"
+			grep -Hn $grep_color "^\\*:$cmd\\*" "$f"
 			fail=$((fail+1))
 		fi
 	done
@@ -45,7 +53,7 @@ sed -nre 's/^\*([a-z][a-z-]*)\* = .*/\1/p' doc/*.scd > "$tmp"
 for f in $(find config -type f -name '*.go'); do
 	for opt in $(sed -nre 's/.*`ini:"([a-z][a-z-]*)".*/\1/p' $f); do
 		if ! grep -qFx "$opt" "$tmp"; then
-			grep -HnF --color "\"$opt\"" "$f"
+			grep -HnF $grep_color "\"$opt\"" "$f"
 			fail=$((fail+1))
 		fi
 	done
diff --git a/contrib/check-patches b/contrib/check-patches
index e0d82896..0fb2aa89 100755
--- a/contrib/check-patches
+++ b/contrib/check-patches
@@ -5,13 +5,14 @@ set -e
 revision_range="${1?revision range}"
 
 valid=0
-total=$(git rev-list --reverse "$revision_range" | wc -l)
+revisions=$(git rev-list --reverse "$revision_range")
+total=$(echo $revisions | wc -w)
 if [ "$total" -eq 0 ]; then
 	exit 0
 fi
 
 n=0
-for rev in $(git rev-list --reverse "$revision_range"); do
+for rev in $revisions; do
 	n=$((n + 1))
 	title=$(git log --format='%s' -1 "$rev")
 	fail=false
diff --git a/contrib/linters.go b/contrib/linters.go
index 41655a67..71895e7c 100644
--- a/contrib/linters.go
+++ b/contrib/linters.go
@@ -5,8 +5,10 @@ import (
 	"go/token"
 	"go/types"
 	"reflect"
+	"strings"
 
 	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/multichecker"
 )
 
 type indirectCalls struct {
@@ -71,7 +73,10 @@ func runPanic(pass *analysis.Pass) (interface{}, error) {
 			}
 
 			if !isPanicHandlerInstall(block.List[0]) {
-				pass.Report(panicDiag(block.Pos()))
+				path := pass.Fset.File(block.Pos()).Name()
+				if !strings.HasSuffix(path, "_test.go") {
+					pass.Report(panicDiag(block.Pos()))
+				}
 			}
 
 			return true
@@ -85,6 +90,9 @@ func runPanicIndirect(pass *analysis.Pass) (interface{}, error) {
 	calls := pass.ResultOf[PanicAnalyzer].(*indirectCalls)
 
 	for _, file := range pass.Files {
+		if strings.HasSuffix(file.Name.Name, "_test") {
+			continue
+		}
 		for _, decl := range file.Decls {
 			if f, ok := decl.(*ast.FuncDecl); ok {
 				if _, ok := calls.methods[f.Name.Pos()]; ok {
@@ -95,7 +103,10 @@ func runPanicIndirect(pass *analysis.Pass) (interface{}, error) {
 					continue
 				}
 				if !isPanicHandlerInstall(f.Body.List[0]) {
-					pass.Report(panicDiag(f.Body.Pos()))
+					path := pass.Fset.File(f.Body.Pos()).Name()
+					if !strings.HasSuffix(path, "_test.go") {
+						pass.Report(panicDiag(f.Body.Pos()))
+					}
 				}
 			}
 		}
@@ -144,16 +155,9 @@ func isPanicHandlerInstall(stmt ast.Stmt) bool {
 	return i.Name == "log" && s.Sel.Name == "PanicHandler"
 }
 
-// golang-lint required plugin api
-type analyzerPlugin struct{}
-
-// This must be implemented
-func (*analyzerPlugin) GetAnalyzers() []*analysis.Analyzer {
-	return []*analysis.Analyzer{
+func main() {
+	multichecker.Main(
 		PanicAnalyzer,
 		PanicIndirectAnalyzer,
-	}
+	)
 }
-
-// This must be defined and named 'AnalyzerPlugin'
-var AnalyzerPlugin analyzerPlugin
diff --git a/contrib/sendemail-validate b/contrib/sendemail-validate
index 7df38e05..dcab4aaa 100755
--- a/contrib/sendemail-validate
+++ b/contrib/sendemail-validate
@@ -30,10 +30,10 @@ validate_patch () {
 	git am -3 "$file"
 }
 
-export CFLAGS="-O2 -g -Wall -Wextra -Wconversion -Warith-conversion -Werror -Wformat-security -Wstack-protector -fstack-protector-strong -fanalyzer"
+export CFLAGS="-O0 -g -std=c99 -Wall -Wextra -Wconversion -Werror -Wformat-security -Wstack-protector -Wpedantic -Wmissing-prototypes"
 
 validate_series () {
-	make all tests lint check-patches
+	gmake all tests lint check-patches
 }
 
 # main -------------------------------------------------------------------------
@@ -41,8 +41,8 @@ validate_series () {
 if test "$GIT_SENDEMAIL_FILE_COUNTER" = 1
 then
 	remote=$(git config --default origin --get sendemail.validateRemote) &&
-	ref=$(git config --default HEAD --get sendemail.validateRemoteRef) &&
-	worktree=$(mktemp --tmpdir -d sendemail-validate.XXXXXXX) &&
+	ref=$(git config --default master --get sendemail.validateRemoteRef) &&
+	worktree=$(mktemp -t -d sendemail-validate.XXXXXXX) &&
 	git worktree add -fd --checkout "$worktree" "refs/remotes/$remote/$ref" &&
 	git config --replace-all sendemail.validateWorktree "$worktree"
 else
diff --git a/filters/colorize.c b/filters/colorize.c
index 1c4f8c63..9500950a 100644
--- a/filters/colorize.c
+++ b/filters/colorize.c
@@ -62,7 +62,7 @@ static void *xmalloc(size_t s)
 #define RESET "\x1b[0m"
 #define LONGEST_SEQ "\x1b[1;2;3;4;5;7;38;2;255;255;255;48;2;255;255;255m"
 
-const char *seq(struct style *s) {
+static const char *seq(struct style *s) {
 	if (!s->sequence) {
 		char *b, *buf = xmalloc(strlen(LONGEST_SEQ) + 1);
 		const char *sep = "";
@@ -249,7 +249,7 @@ static int parse_color(struct color *c, const char *val)
 	} else if (sscanf(val, "#%x", &color) == 1 && color <= 0xffffff) {
 		c->type = RGB;
 		c->rgb = color;
-	} else if (sscanf(val, "%d", &color) == 1 && color <= 256) {
+	} else if (sscanf(val, "%u", &color) == 1 && color <= 256) {
 		c->type = PALETTE;
 		c->index = color;
 	} else if (!color_name(val, &color)) {
@@ -702,7 +702,7 @@ static void colorize_line(const char *in)
 	}
 }
 
-int parse_args(int argc, char **argv)
+static int parse_args(int argc, char **argv)
 {
 	const char *filename = NULL, *osc8 = NULL;
 	int c;
diff --git a/filters/wrap.c b/filters/wrap.c
index e6c73057..59c44522 100644
--- a/filters/wrap.c
+++ b/filters/wrap.c
@@ -7,6 +7,7 @@
 #include <locale.h>
 #include <regex.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -33,7 +34,7 @@ static size_t prose_ratio = 50;
 static bool reflow;
 static FILE *in_file;
 
-int parse_args(int argc, char **argv)
+static int parse_args(int argc, char **argv)
 {
 	const char *filename = NULL;
 	long value;
@@ -362,18 +363,18 @@ static void write_paragraph(struct paragraph *p)
 			more = false;
 		} else {
 			/* find split point, preferably before margin */
-			size_t split = -1U;
+			size_t split = SIZE_MAX;
 			size_t w = 0;
 			for (size_t i = 0; text[i] != L'\0'; i++) {
 				w += (size_t)wcwidth(text[i]);
-				if (width + w > margin && split != -1U) {
+				if (width + w > margin && split != SIZE_MAX) {
 					break;
 				}
 				if (iswspace((wint_t)text[i])) {
 					split = i;
 				}
 			}
-			if (split == -1U) {
+			if (split == SIZE_MAX) {
 				/* no space found to split, print a long line */
 				line = text;
 				more = false;
diff --git a/go.mod b/go.mod
index 7e498726..79a2a4af 100644
--- a/go.mod
+++ b/go.mod
@@ -51,6 +51,7 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.8.1 // indirect
 	golang.org/x/crypto v0.8.0 // indirect
+	golang.org/x/mod v0.8.0 // indirect
 	golang.org/x/net v0.9.0 // indirect
 	golang.org/x/term v0.7.0 // indirect
 	golang.org/x/text v0.12.0 // indirect
diff --git a/go.sum b/go.sum
index f2715f82..33ea7767 100644
--- a/go.sum
+++ b/go.sum
@@ -152,6 +152,7 @@ github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJu
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0 h1:LUYupSeNrTNCGzR/hVBk2NHZO4hXcVaW1k4Qx7rjPx8=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@@ -167,6 +168,7 @@ golang.org/x/oauth2 v0.7.0/go.mod h1:hPLQkd9LyjfXTiRohC/41GhcFqxisoUQ99sCUOHO9x4
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=