From 570ec471d1605318aeefb030cd78682ae442235b Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Mon, 31 Mar 2025 21:51:40 -0300
Subject: src/content/: Update all files left to asciidoc

---
 src/content/tils/2021/01/12/curl-awk-emails.adoc | 100 ++++++++++++-----------
 1 file changed, 53 insertions(+), 47 deletions(-)

(limited to 'src/content/tils/2021/01/12/curl-awk-emails.adoc')

diff --git a/src/content/tils/2021/01/12/curl-awk-emails.adoc b/src/content/tils/2021/01/12/curl-awk-emails.adoc
index 880ddf1..875c655 100644
--- a/src/content/tils/2021/01/12/curl-awk-emails.adoc
+++ b/src/content/tils/2021/01/12/curl-awk-emails.adoc
@@ -1,28 +1,25 @@
----
+= Awk snippet: send email to multiple recipients with cURL
 
-title: 'Awk snippet: send email to multiple recipients with cURL'
+:neomutt: https://neomutt.org/
+:found-out-article: https://blog.edmdesigner.com/send-email-from-linux-command-line/
+:curl: https://curl.se/
 
-date: 2021-01-12
-
-layout: post
-
-lang: en
-
-ref: awk-snippet-send-email-to-multiple-recipients-with-curl
-
----
-
-As I experiment with [Neomutt][neomutt], I wanted to keep being able to enqueue emails for sending later like my previous setup, so that I didn't rely on having an internet connection.
+As I experiment with {neomutt}[Neomutt], I wanted to keep being able to enqueue
+emails for sending later like my previous setup, so that I didn't rely on having
+an internet connection.
 
 My requirements for the `sendmail` command were:
-1. store the email in a file, and send it later.
-1. send from different addresses, using different SMTP servers;
 
-I couldn't find an MTA that could accomplish that, but I was able to quickly write a solution.
+. store the email in a file, and send it later;
+. send from different addresses, using different SMTP servers.
+
+I couldn't find an MTA that could accomplish that, but I was able to quickly
+write a solution.
 
 The first part was the easiest: store the email in a file:
 
-```shell
+[source,shell]
+----
 # ~/.config/mutt/muttrc:
 set sendmail=~/bin/enqueue-email.sh
 
@@ -30,20 +27,24 @@ set sendmail=~/bin/enqueue-email.sh
 #!/bin/sh -eu
 
 cat - > "$HOME/mbsync/my-queued-emails/$(date -Is)"
-```
+----
 
-Now that I had the email file store locally, I needed a program to send the email from the file, so that I could create a cronjob like:
+Now that I had the email file store locally, I needed a program to send the
+email from the file, so that I could create a cronjob like:
 
-```shell
+[source,shell]
+----
 for f in ~/mbsync/my-queued-emails/*; do
   ~/bin/dispatch-email.sh "$f" && rm "$f"
 done
-```
+----
 
-The `dispatch-email.sh` would have to look at the `From: ` header and decide which SMTP server to use.
-As I [found out][curl-email] that [curl][curl] supports SMTP and is able to send emails, this is what I ended up with:
+The `dispatch-email.sh` would have to look at the `From:` header and decide
+which SMTP server to use.  As I {found-out-article}[found out] that {curl}[curl]
+supports SMTP and is able to send emails, this is what I ended up with:
 
-```shell
+[source,shell]
+----
 #!/bin/sh -eu
 
 F="$1"
@@ -79,24 +80,30 @@ else
   echo 'Bad "From: " address'
   exit 1
 fi
-```
+----
 
 Most of curl flags used are self-explanatory, except for `$rcpt`.
 
-curl connects to the SMTP server, but doesn't set the recipient address by looking at the message.
-My solution was to generate the curl flags, store them in `$rcpt` and use it unquoted to leverage shell word splitting.
+curl connects to the SMTP server, but doesn't set the recipient address by
+looking at the message.  My solution was to generate the curl flags, store them
+in `$rcpt` and use it unquoted to leverage shell word splitting.
 
-To me, the most interesting part was building the `$rcpt` flags.
-My first instinct was to try grep, but it couldn't print only matches in a regex.
-As I started to turn towards sed, I envisioned needing something else to loop over the sed output, and I then moved to Awk.
+To me, the most interesting part was building the `$rcpt` flags.  My first
+instinct was to try grep, but it couldn't print only matches in a regex.  As I
+started to turn towards sed, I envisioned needing something else to loop over
+the sed output, and I then moved to Awk.
 
-In the short Awk snippet, 3 things were new to me: the `match(...)`, `split(...)` and `for () {}`.
-The only other function I have ever used was `gsub(...)`, but these new ones felt similar enough that I could almost guess their behaviour and arguments.
-`match(...)` stores the matches of a regex on the given array positionally, and `split(...)` stores the chunks in the given array.
+In the short Awk snippet, 3 things were new to me: the `match(...)`,
+`split(...)` and `for () {}`.  The only other function I have ever used was
+`gsub(...)`, but these new ones felt similar enough that I could almost guess
+their behaviour and arguments.  `match(...)` stores the matches of a regex on
+the given array positionally, and `split(...)` stores the chunks in the given
+array.
 
 I even did it incrementally:
 
-```shell
+[source,shell]
+----
 $ H='To: to@example.com, to2@example.com\nCc: cc@example.com, cc2@example.com\nBcc: bcc@example.com,bcc2@example.com\n'
 $ printf "$H" | awk '/^To: .*$/ { print $0 }'
 To: to@example.com, to2@example.com
@@ -115,28 +122,27 @@ to@example.com,
 $ printf "$H" | awk 'match($0, /^To: (.*)$/, m) { split(m[1], tos, " "); print tos[2] }'
 to2@example.com
 $ printf "$H" | awk 'match($0, /^To: (.*)$/, m) { split(m[1], tos, " "); print tos[3] }'
+----
 
-```
+(This isn't the verbatim interactive session, but a cleaned version to make it
+more readable.)
 
-(This isn't the verbatim interactive session, but a cleaned version to make it more readable.)
+At this point, I realized I needed a for loop over the `tos` array, and I moved
+the Awk snippet into the `~/bin/dispatch-email.sh`.  I liked the final thing:
 
-At this point, I realized I needed a for loop over the `tos` array, and I moved the Awk snippet into the `~/bin/dispatch-email.sh`.
-I liked the final thing:
-
-```awk
+[source,awk]
+----
 match($0, /^(To|Cc|Bcc): (.*)$/, m) {
   split(m[2], tos, ",")
   for (i in tos) {
     print "--mail-rcpt " tos[i]
   }
 }
-```
+----
 
-As I learn more about Awk, I feel that it is too undervalued, as many people turn to Perl or other programming languages when Awk suffices.
-The advantage is pretty clear: writing programs that run on any POSIX system, without extra dependencies required.
+As I learn more about Awk, I feel that it is too undervalued, as many people
+turn to Perl or other programming languages when Awk suffices.  The advantage is
+pretty clear: writing programs that run on any POSIX system, without extra
+dependencies required.
 
 Coding to the standards is underrated.
-
-[neomutt]: https://neomutt.org/
-[curl-email]: https://blog.edmdesigner.com/send-email-from-linux-command-line/
-[curl]: https://curl.se/
-- 
cgit v1.2.3

