fix: skip tmux -T title flag on versions older than 3.3 (#40)

* fix: skip tmux -T title flag on versions older than 3.3

The -T flag for display-popup was added in tmux 3.3. Detect version
and conditionally include it to avoid errors on older tmux installs.
Also remove go runtime version from --version output.

* fix: use bash regex instead of sort -V for tmux version check

sort -V is a GNU extension not available on all platforms.
Use bash BASH_REMATCH for portable major/minor comparison.

Author: umputun

.claude-plugin/skills/revdiff/scripts/launch-revdiff.sh

@@ -45,7 +45,15 @@ POPUP_H="${REVDIFF_POPUP_HEIGHT:-90%}"
 
 # tmux: display-popup -E blocks until command exits
 if [ -n "${TMUX:-}" ] && command -v tmux >/dev/null 2>&1; then
-    tmux display-popup -E -w "$POPUP_W" -h "$POPUP_H" -T " $OVERLAY_TITLE " -d "$CWD" -- sh -c "$REVDIFF_CMD"
+    # -T (title) requires tmux 3.3+; skip on older versions
+    TMUX_ARGS=(tmux display-popup -E -w "$POPUP_W" -h "$POPUP_H")
+    if [[ "$(tmux -V 2>/dev/null)" =~ ([0-9]+)\.([0-9]+) ]]; then
+        if [ "${BASH_REMATCH[1]}" -gt 3 ] || { [ "${BASH_REMATCH[1]}" -eq 3 ] && [ "${BASH_REMATCH[2]}" -ge 3 ]; }; then
+            TMUX_ARGS+=(-T " $OVERLAY_TITLE ")
+        fi
+    fi
+    TMUX_ARGS+=(-d "$CWD" -- sh -c "$REVDIFF_CMD")
+    "${TMUX_ARGS[@]}"
     cat "$OUTPUT_FILE"
     exit 0
 fi

cmd/revdiff/main.go

@@ -8,7 +8,6 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"runtime"
 	"strings"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -103,7 +102,7 @@ func main() {
 
 	// early-exit commands that don't need theme resolution
 	if opts.Version {
-		fmt.Printf("version: %s\ngo: %s\n", revision, runtime.Version())
+		fmt.Printf("version: %s\n", revision)
 		os.Exit(0)
 	}
 

plugins/revdiff-planning/scripts/launch-plan-review.sh

@@ -35,7 +35,15 @@ OVERLAY_TITLE="plan: $(basename "$PLAN_FILE")"
 
 # tmux: display-popup -E blocks until command exits
 if [ -n "${TMUX:-}" ] && command -v tmux >/dev/null 2>&1; then
-    tmux display-popup -E -w 90% -h 90% -T " $OVERLAY_TITLE " -- sh -c "$REVDIFF_CMD"
+    # -T (title) requires tmux 3.3+; skip on older versions
+    TMUX_ARGS=(tmux display-popup -E -w 90% -h 90%)
+    if [[ "$(tmux -V 2>/dev/null)" =~ ([0-9]+)\.([0-9]+) ]]; then
+        if [ "${BASH_REMATCH[1]}" -gt 3 ] || { [ "${BASH_REMATCH[1]}" -eq 3 ] && [ "${BASH_REMATCH[2]}" -ge 3 ]; }; then
+            TMUX_ARGS+=(-T " $OVERLAY_TITLE ")
+        fi
+    fi
+    TMUX_ARGS+=(-- sh -c "$REVDIFF_CMD")
+    "${TMUX_ARGS[@]}"
     cat "$OUTPUT_FILE"
     exit 0
 fi