Fix version checks

check-version.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+
+# Compare the current tmux version against a given version.
+# Exit: 0 if comparison is true, 1 if false
+
+set -euo pipefail
+
+usage() {
+  echo "usage: $0 <operator> <version>" >&2
+  echo "operators: < <= == >= >" >&2
+}
+
+if [[ ${1:-} == "-h" || ${1:-} == "--help" ]]; then
+  usage
+  exit 0
+fi
+
+if [[ $# -ne 2 ]]; then
+  usage
+  exit 1
+fi
+
+operator="$1"
+target_version="$2"
+
+# Extract tmux version (e.g., "tmux 3.3a" -> "3.3a")
+current_version=$(tmux -V | sed 's/^tmux //')
+
+# Compare two version strings
+# Returns: -1 if v1 < v2, 0 if v1 == v2, 1 if v1 > v2
+compare_versions() {
+  local v1="$1"
+  local v2="$2"
+
+  # Strip trailing letters (e.g., "3.3a" -> "3.3") and save them
+  local v1_suffix="${v1##*[0-9]}"
+  local v2_suffix="${v2##*[0-9]}"
+  v1="${v1%[a-zA-Z]*}"
+  v2="${v2%[a-zA-Z]*}"
+
+  # Split into components
+  IFS='.' read -ra v1_parts <<< "$v1"
+  IFS='.' read -ra v2_parts <<< "$v2"
+
+  # Compare numeric parts
+  local max_len=$(( ${#v1_parts[@]} > ${#v2_parts[@]} ? ${#v1_parts[@]} : ${#v2_parts[@]} ))
+  for ((i = 0; i < max_len; i++)); do
+    local p1="${v1_parts[i]:-0}"
+    local p2="${v2_parts[i]:-0}"
+    if ((p1 < p2)); then
+      echo -1
+      return
+    elif ((p1 > p2)); then
+      echo 1
+      return
+    fi
+  done
+
+  # Numeric parts equal, compare suffixes (no suffix < a < b < ...)
+  # A letter suffix indicates a patch release, so 3.6a > 3.6
+  if [[ -z "$v1_suffix" && -n "$v2_suffix" ]]; then
+    echo -1
+    return
+  elif [[ -n "$v1_suffix" && -z "$v2_suffix" ]]; then
+    echo 1
+    return
+  elif [[ "$v1_suffix" < "$v2_suffix" ]]; then
+    echo -1
+    return
+  elif [[ "$v1_suffix" > "$v2_suffix" ]]; then
+    echo 1
+    return
+  fi
+
+  echo 0
+}
+
+result=$(compare_versions "$current_version" "$target_version")
+
+case "$operator" in
+  '<')
+    [[ "$result" -eq -1 ]] && exit 0 || exit 1 ;;
+  '<=')
+    [[ "$result" -le 0 ]] && exit 0 || exit 1 ;;
+  '==')
+    [[ "$result" -eq 0 ]] && exit 0 || exit 1 ;;
+  '>=')
+    [[ "$result" -ge 0 ]] && exit 0 || exit 1 ;;
+  '>')
+    [[ "$result" -eq 1 ]] && exit 0 || exit 1 ;;
+  *)
+    echo "error: invalid operator: $operator" >&2
+    usage
+    exit 1
+    ;;
+esac