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Thu, 16 May 2024 18:39:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=wolfsden.cz; s=mail; t=1715884795; bh=IOZbAPxJl4ofhzKWtIcQJRolvM6b+LHlX5HBU7Ol/FU=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=mgXXFit/jAkWdhWe1rp5tNpAWEfrFnU/RA1IPQhyGGyyhb3UGvxZJP6eOZ1qUwHAj GUkPVXKai0DG9GnEK74RnW5XWCDJECPwISugdYO8Bt3HMBjjft6YoDGx7fzgtEekOa BQQaz8Q/ZEIy3f21mrNsASe15tVL6SVuXckB+YcxXUZsAVQ0JuuHJtb9OP5PKzVAsT xVd1IpBILluYezaIjZ27G+KExVIg3rTrqrzI9j8wdRJuoYlSPBs2XJj2hxGakYPYsj lrGAf2EkBiLca0XnYb5fahGjrkJrJtYz+BI9EceqnWYA1exB/mkHuHxUcDpbryldWV QK+qn7yormE2U8z/m/OYCDIMEiH3AikGh14VndDzPBV5Q8+CsgyU68hvVmr+nYuFp6 bJpamCGF3rxpamJQqQvRHyozxL4W2iBte/XUSlh/0ndQ+EpN1C21VNXQnkTpQmcsS5 uuupGUYEy0JnGb4hGNSvec7uJCBaQTxtJydjQICEz9Bp1Z6XKAvCYpdlKCOykCBwfH ZvOC6/0v4DLMMfJioYim4dmWGr7MKVPewHN9WpaWWlOu8fOB1ncL4zOZuGnwJY3kUj +X2UKwc/GFCkN8C2P7Tt7t9+FT6LHvpJW/biw1WbKHLiFOsJw59dZd7eQT1w250x5y F8x5BUGKIj6uuNyPdOBdfdfQ= Date: Thu, 16 May 2024 20:39:54 +0200 From: Tomas Volf <~@wolfsden.cz> To: Giovanni Biscuolo Cc: help-guix@gnu.org Subject: Re: how to use a variable in a plain-file object? Message-ID: Mail-Followup-To: Giovanni Biscuolo , help-guix@gnu.org References: <87le493g1o.fsf@xelera.eu> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="cjNHPao8t5jojKD4" Content-Disposition: inline In-Reply-To: <87le493g1o.fsf@xelera.eu> Received-SPF: pass client-ip=37.205.8.62; envelope-from=~@wolfsden.cz; helo=wolfsden.cz X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-guix@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+larch=yhetil.org@gnu.org Sender: help-guix-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US X-Migadu-Spam-Score: -6.01 X-Spam-Score: -6.01 X-Migadu-Queue-Id: 3956060879 X-Migadu-Scanner: mx11.migadu.com X-TUID: P/ybzg1Q0hU0 --cjNHPao8t5jojKD4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On 2024-05-16 17:57:55 +0200, Giovanni Biscuolo wrote: > Hello, > > sorry for the very guile-absolute-beginner question, but I'd like to use > a declared variable in a plain-file object, so I can write something > like in this pseudo-code snippet: > > --8<---------------cut here---------------start------------->8--- > > (define variable1 "var1-value") > (define variable2 "var2-value") > > [...] > > (define %my-file-object > ,(plain-file "something.conf" " > # This is an example configuration file > > attribute1 =" variable1 " > > attribute2 =" variable2 " > > ")) > > --8<---------------cut here---------------end--------------->8--- > > and obtain a "something.conf" file like this: > > --8<---------------cut here---------------start------------->8--- > # This is an example configuration file > > attribute1 = var1-value > > attribute2 = var2-value > > --8<---------------cut here---------------end--------------->8--- > > how can I do, please? I believe you can use mixed-text-file for this purpose: /tmp/xx.scm: (use-modules (guix gexp)) (define var1 "var1-value") (define var2 "var2-value") (define %my-file-object (mixed-text-file "something.conf" "\ # This is an example configuration file attribute1 = " var1 " attribute2 = " var2 " ")) %my-file-object When I build it and inspect the result: $ cat $(guix build -e '(load "/tmp/xx.scm")') # This is an example configuration file attribute1 = var1-value attribute2 = var2-value The mixed-text-file accepts string *and* file-like objects as arguments. That makes it very suitable for constructing configuration files, since you can expand paths, for example like this: /tmp/yy.scm: (use-modules (gnu packages base) (guix gexp)) (define %my-file-object (mixed-text-file "something.conf" "\ SED_PATH = " sed "/bin/sed ")) %my-file-object And here is the result: $ cat $(guix build -e '(load "/tmp/yy.scm")') SED_PATH = /gnu/store/6kkygybkxkzqy3lf6k5kzimk5mjasrvw-sed-4.8/bin/sed Hope this is useful and have a nice day, Tomas Volf -- There are only two hard things in Computer Science: cache invalidation, naming things and off-by-one errors. --cjNHPao8t5jojKD4 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEt4NJs4wUfTYpiGikL7/ufbZ/wakFAmZGUvoACgkQL7/ufbZ/ walZOhAAlMTQfhaYIOtxwyf3/rEqA+b+nJg/huJspsjq+3V2QrvtUmS8qsHdVPi2 iFosWd1jF/nl1cdt//kGxajPZsf++VSpXeKDC5N3wCYPUmzJrddUkW1HIizjHxuq I47W2PJHguOhD506AuCefTh6wC1aiS4GyWpn9QcntdMO2iHk8RoKn28SRG2io66H ptx7+YZlRgJuCeTpQT+B25VRdkX2e/I1M4MBGzwOJ7R3t1d+d5p0ygW7bUxeVDuU t9NjYAVDfpFRjdMljtQBm00DYyv6m7x55tXZE2i3L++G0bAU7S8eyeF5F6UOY0n+ am8sqKFM8lNCnlVKxhbe6kF2FP20BM4UlWMxBjWRZSyICr1xZ3FtEp+6DrWvDpaT 6esiglrRWf7OyMO+/wY1ssN+B4tJMR6wNFKRb9aFN91ANuDMn9sY99pxHDNoJ9z4 I9Nb4HUu78rn+5LLLUoEmAA6zS0bWcrD3+yFOlN/GPrYFFVWGshuOg+Nj7JG40z2 7yv9FO2iUWGMXrefjpP3shM8kMnZQ4nrnGFi7ZuTmgTPLx6PU/p1lKSkOSvo/W4T cBzrX4j9hHzziykMZb4hPsSX9SRySxebO8zRBE1s47zLHcWm3nD6We/M+hSTZ2wm hiXuOf/K/AZicUeYAlVdbis82pRLEYKcCvWbODHBoAVuKmpApIg= =hxYi -----END PGP SIGNATURE----- --cjNHPao8t5jojKD4--