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Fri, 17 Feb 2023 09:15:53 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Roman Perepelitsa Date: Fri, 17 Feb 2023 18:15:40 +0100 Message-ID: Subject: Re: what can be global aliases used for? To: Sebastian Gniazdowski Cc: Zsh hackers list Content-Type: text/plain; charset="UTF-8" X-Seq: 51450 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: On Fri, Feb 17, 2023 at 3:59 PM Sebastian Gniazdowski wrote: > > I'm trying to get the suspected capabilities out of global aliases. Currently I'm using them for: > - macro-like labels for exporting patterns like EMPTYSTR being [[:space:][:INVALID:]]# roughly, to a single place, > - macro-like SNIP_EMULATE_OPTIONS_ZERO that invokes emulate, setopt and 0=... > > I wonder what else can global aliases do? Global aliases are unhygienic macros. It's rarely a good idea to use unhygienic macros in the code you share with others. If you must use an unhygienic macro in shared code, give it a long and ugly name to avoid clashes. EMPTYSTR can be a parameter. You would have to use $~EMPTYSTR but you'll avoid most of the pitfalls of unhygienic macros. SNIP_EMULATE_OPTIONS_ZERO can also be a parameter, which you can use via `eval $SNIP_EMULATE_OPTIONS_ZERO`. I do something like this in zsh4humans: typeset -gr _z4h_opt='emulate -L zsh && setopt typeset_silent pipe_fail extended_glob && setopt prompt_percent no_prompt_subst no_prompt_bang && setopt no_bg_nice no_aliases || return' function foo() { eval "$_z4h_opt" # do stuff } function bar() { eval "$_z4h_opt" # do stuff } Roman.