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zsh/.oh-my-zsh/plugins/git-auto-fetch/git-auto-fetch.plugin.zsh

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+# Default auto-fetch interval: 60 seconds
+: ${GIT_AUTO_FETCH_INTERVAL:=60}
+
+# Necessary for the git-fetch-all function
+zmodload zsh/datetime zsh/stat
+
+function git-fetch-all {
+  (
+    # Get git root directory
+    if ! gitdir="$(command git rev-parse --git-dir 2>/dev/null)"; then
+      return 0
+    fi
+
+    # Do nothing if auto-fetch is disabled or don't have permissions
+    if [[ ! -w "$gitdir" || -f "$gitdir/NO_AUTO_FETCH" ]] ||
+       [[ -f "$gitdir/FETCH_LOG" && ! -w "$gitdir/FETCH_LOG" ]]; then
+      return 0
+    fi
+
+    # Get time (seconds) when auto-fetch was last run
+    lastrun="$(zstat +mtime "$gitdir/FETCH_LOG" 2>/dev/null || echo 0)"
+    # Do nothing if not enough time has passed since last auto-fetch
+    if (( EPOCHSECONDS - lastrun < $GIT_AUTO_FETCH_INTERVAL )); then
+      return 0
+    fi
+
+    # Fetch all remotes (avoid ssh passphrase prompt)
+    date -R &>! "$gitdir/FETCH_LOG"
+    GIT_SSH_COMMAND="command ssh -o BatchMode=yes" \
+      command git fetch --all 2>/dev/null &>> "$gitdir/FETCH_LOG"
+  ) &|
+}
+
+function git-auto-fetch {
+  # Do nothing if not in a git repository
+  command git rev-parse --is-inside-work-tree &>/dev/null || return 0
+
+  # Remove or create guard file depending on its existence
+  local guard="$(command git rev-parse --git-dir)/NO_AUTO_FETCH"
+  if [[ -f "$guard" ]]; then
+    command rm "$guard" && echo "${fg_bold[green]}enabled${reset_color}"
+  else
+    command touch "$guard" && echo "${fg_bold[red]}disabled${reset_color}"
+  fi
+}
+
+# zle-line-init widget (don't redefine if already defined)
+(( ! ${+functions[_git-auto-fetch_zle-line-init]} )) || return 0
+
+case "$widgets[zle-line-init]" in
+  # Simply define the function if zle-line-init doesn't yet exist
+  builtin|"") function _git-auto-fetch_zle-line-init() {
+      git-fetch-all
+    } ;;
+  # Override the current zle-line-init widget, calling the old one
+  user:*) zle -N _git-auto-fetch_orig_zle-line-init "${widgets[zle-line-init]#user:}"
+    function _git-auto-fetch_zle-line-init() {
+      git-fetch-all
+      zle _git-auto-fetch_orig_zle-line-init -- "$@"
+    } ;;
+esac
+
+zle -N zle-line-init _git-auto-fetch_zle-line-init