[StumpWM, bin] Add weather module to StumpWM, convert we to POSIX sh

Convert script `we` from fish to POSIX shell

Add two new scripts:
- stump-choose-city
- stump-weather
The former one sets the default city used for weather. The latter
generates the output used by StumpWM’s mode-line.

org/config/bin.org

@@ -2044,18 +2044,77 @@ CACHEFILE=$([ -n "$XDG_CACHE_HOME" ] && echo "$XDG_CACHE_HOME/wallpaper" || echo
 
 * Weather
 :PROPERTIES:
-:HEADER-ARGS: :shebang "#!/usr/bin/env fish" :mkdirp yes :tangle ~/.local/bin/we
 :CUSTOM_ID: Weather-4ed00bb0
 :END:
-A quick and useful script I often use is a ~curl~ request to [[http://v2.wttr.in/][v2.wttr.in]] to get a
-weather forecast in the terminal. By default, I want the request to be about the
-city I live in, but it is also possible for the script to accept as its
-arguments a search inquiry.
-#+BEGIN_SRC fish
-if count $argv > /dev/null
-    set -l SEARCH (string join '+' $argv)
-    curl http://v2.wttr.in/~$SEARCH
+** StumpWM utilities
+:PROPERTIES:
+:CUSTOM_ID: Weather-StumpWM-utilities-okvit9r05gj0
+:END:
+*** ~stump-choose-city~
+:PROPERTIES:
+:CUSTOM_ID: Weather-StumpWM-utilities-stump-choose-city-adyit9r05gj0
+:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/stump-choose-city
+:END:
+This script does two things. First, I get to choose a location which
+weather will be displayed in StumpWM’s mode-line. The script stores
+the selected location in the file ~$HOME/.cache/weather-city~, but only
+if the input is not an empty string, otherwise nothing will change.
+Secondly, if this change is applied, ~stump-weather~ (described below)
+is called in order to update what StumpWM displays.
+#+begin_src sh
+CITY=$(rofi -p "City:" -dmenu | sed -r 's/ +/\+/g')
+if [ -n "$CITY" ]; then
+    printf "%s" "$CITY" > "$HOME"/.cache/weather-city
+    stump-weather > /dev/null 2>&1
+fi
+#+end_src
+
+*** ~stump-weather~
+:PROPERTIES:
+:CUSTOM_ID: Weather-StumpWM-utilities-stump-weather-i21jt9r05gj0
+:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/stump-weather
+:END:
+This stript is quite simple: it displays some weather information in
+the format /Location: weather temperature (felt temperature)/. We use
+the content of the file ~$HOME/.cache/weather-city~ to know which
+location to use in our request to ~wttr.in~. If ~wttr.in~ is unreachable
+after two second, the request aborts and the script displays an error
+message instead.
+#+begin_src sh
+CITY=$(cat "$HOME/.cache/weather-city")
+WEATHER=$(curl wttr.in/~"${CITY}"?format="${CITY}:+%C+%t+(%f)" --connect-timeout 1 2> /dev/null)
+if [ -n "$WEATHER" ]; then
+    printf "%s" "$WEATHER"
 else
-    curl http://v2.wttr.in/Aubervilliers
-end
+    printf "wttr.in unreachable"
+fi
+#+end_src
+
+** ~we~
+:PROPERTIES:
+:CUSTOM_ID: Weather-we-514jt9r05gj0
+:HEADER-ARGS: :shebang "#!/usr/bin/env sh" :mkdirp yes :tangle ~/.local/bin/we
+:END:
+A quick and useful script I often use is a ~curl~ request to [[http://v2.wttr.in/][v2.wttr.in]]
+to get a weather forecast in the terminal. If the user passes no
+arguments to ~we~, the script will use the location designated in
+~$HOME/.cache/weather-city~. Otherwise, it will use the options passed
+by the user.
+#+BEGIN_SRC sh
+COUNT=0
+LOCATION=""
+if [ "$#" = 0 ]; then
+    LOCATION=$(cat "$HOME"/.cache/weather-city)
+fi
+if [ -z "$LOCATION" ]; then
+    for ARG in $*; do
+        if [ "${COUNT}" = 0 ]; then
+            LOCATION="${ARG}"
+        else
+            LOCATION="${LOCATION}+${ARG}"
+        fi
+        COUNT=$((COUNT + 1))
+    done
+fi
+curl https://v2.wttr.in/~"${LOCATION}"
 #+END_SRC

org/config/stumpwm.org

@@ -494,10 +494,11 @@ be separated by a Powerline separator with the code point ~0xE0B0~ in
 the font I am using (see §[[#Theme-Fonts-28pc8141v5j0]]).
 #+name: modeline-format
 | Formatter     | What it does                                          | Command? |
-|-----------+-------------------------------------------------------+----------|
+|---------------+-------------------------------------------------------+----------|
 | ~%g~            | Display list of groups                                |          |
 | ~%W~            | Display list of windows in the current group and head |          |
 | ~^>~            | Rest of the modeline align to the right               |          |
+| ~stump-weather~ | Display the current weather                           | yes      |
 | ~mu-unread~     | Display number of unread emails                       | yes      |
 | ~%m~            | Display current MPD song                              |          |
 | ~%I~            | Display Wifi status                                   |          |
@@ -518,8 +519,8 @@ the font I am using (see §[[#Theme-Fonts-28pc8141v5j0]]).
         elements)
 #+end_src
 
-#+RESULTS[7f62146daae5aab6014d303b57c306fe44c4087b]: modeline-format-gen
-: (("%g") ("%W") ("^>") ("mu-unread" . t) ("%m") ("%I") ("%l") ("%C") ("%M") ("%B") ("%d"))
+#+RESULTS[4a774559ef9c88c74aa62a42c6f53fdc401815aa]: modeline-format-gen
+: (("%g") ("%W") ("^>") ("stump-weather" . t) ("mu-unread" . t) ("%m") ("%I") ("%l") ("%C") ("%M") ("%B") ("%d"))
 
 #+begin_src lisp :noweb yes
 (defvar *mode-line-formatter-list*