Add an analog clock

Using `LP_TIME_ANALOG`, you can now display an analog clock instead of
numeric values. The analog clock is "accurate" to the nearest half hour.

README.md

@@ -28,13 +28,17 @@ in a git repository on a server, at branch "myb":
 
 A liquid prompt displaying everything (a rare event!) may look like this:
 
-`code ⌁24% ⌂42% 3d/2&/1z [user@server:~/ … /code/liquidprompt]↥ master(+10/-5,3)*+ 125 ± `
+`code 🕤  ⌁24% ⌂42% 3d/2&/1z [user@server:~/ … /code/liquidprompt][pyenv]↥ master(+10/-5,3)*+ 125 ± `
 
-It displays:
+It (may) displays:
 
-* a green ⌁ if the battery is charging and above a given threshold,
-a yellow ⌁ if the battery is charging and under threshold,
-a red ⌁ if the battery is discharging but above threshold;
+* A tag associated to the current shell session (you can easily add any
+prefix tag to your prompt, by invoking `prompt_tag MYTAG`).
+* The current time, either as numerci values or an analog clock,
+* a green ⏚ if the battery is charging, above the given threshold, but not charged,
+a yellow ⏚ if the battery is charging and under threshold,
+a yellow ⌁ if the battery is discharging but above threshold,
+a  red ⌁ if the battery is discharging and under threshold;
 * the average of the batteries remaining power, if it is under the given
 threshold, with a colormap, going more and more red with decreasing power;
 * the average of the processors load, if it is over a given limit, with a
@@ -66,11 +70,10 @@ changes have been made and the number of pending commits, if any;
 * a yellow plus if there is stashed modifications;
 * a red star if there is some untracked files in the repository;
 * the error code of the last command, if it has failed in some way;
-* a smart mark: ± for git directories, ☿ for mercurial, ‡ for svn, ⌘
-for fossil, $ for simple user, a red # for root;
+* a smart mark: ± for git directories, ☿ for mercurial, ‡ for svn,
+‡± for git-svn, ⌘ for fossil, $ or % for simple user, a red # for root;
 * if you ask for, the liquidprompt will be replicated in your terminal window's
 title (without the colors);
-* you can easily add a prefix tag to your prompt, by invoking `prompt_tag MYTAG`.
 
 You can temporarily deactivate the liquid prompt and come back to your previous
 one by typing `prompt_off`. Use `prompt_on` to bring it back. You can deactivate
@@ -140,6 +143,8 @@ building:
 * `LP_ENABLE_TITLE`, if you want to use the prompt as your terminal window's title
 * `LP_ENABLE_SCREEN_TITLE`, if you want to use the prompt as your screen window's title
 * `LP_ENABLE_SSH_COLORS`, if you want different colors for hosts you SSH in
+* `LP_ENABLE_TIME`, if you want to display the time at which the prompt was shown
+* `LP_TIME_ANALOG`, when showing time, use an analog clock instead of numeric values
 
 Note that if required commands are not installed, enabling the
 corresponding feature will have no effect.
@@ -298,10 +303,12 @@ version 3.
 
 * Does not display the number of commits to be pushed in Mercurial repositories.
 * Browsing into very large subversion repositories may dramatically slow down
-the display of the liquid prompt.
+the display of the liquid prompt (use `LP_DISABLED_VCS_PATH` to avoid that).
 * Subversion repository cannot display commits to be pushed, this is a
 limitation of the Subversion versionning model.
 * The proxy detection only uses the `$http_proxy` environment variable.
 * The window's title escape sequence may not work properly on some terminals
 (like xterm-256)
+* The analog clock necessitate a unicode-aware terminal and a sufficiently
+complete font.
 

liquidprompt

@@ -1299,10 +1299,56 @@ _lp_sb()
 ###################
 # CURRENT TIME    #
 ###################
+_lp_time_analog()
+{
+    # get the date as "hours(12) minutes" in a single call
+    # make a bash array with it
+    d=( $(date "+%I %M") )
+    # separate hours and minutes
+    hour=${d[0]#0} # no leading 0
+    min=${d[1]#0}
+
+    # The targeted unicode characters are the "CLOCK FACE" ones
+    # They are located in the codepages between:
+    #     U+1F550 (ONE OCLOCK) and U+1F55B (TWELVE OCLOCK), for the plain hours
+    #     U+1F55C (ONE-THIRTY) and U+1F567 (TWELVE-THIRTY), for the thirties
+    #
+    # Those codes may be output with unicode escapes or hexadecimal escapes,
+    # the later being the more portable.
+    #
+    # But we can iterate only over integers.
+    #
+    # We thus need the following conversion table:
+    #       utf   hex   int
+    # hours 50:5B 90:9b 144:155
+    # half  5C:67 9c:a7 156:167
+
+    # The characters being grouped bas plain/thirty, we must first now
+    # if we are close to the 0 or 30 minutes.
+    # Bash using integer arithmetic by default, we do not need rounding.
+    # We thus add 0 (plain hour) or 12 (half).
+    # Then we add 144, which is the first index (as an integer).
+    mi=$((144+12*($min/30)))
+
+    # Add the computed minutes index (144 or 156) minus 1 (because the first hour starts at 0).
+    hi=$(($mi+$hour-1))
+
+    # Get the hexadecimal representation of this integer
+    hex=$(printf "%x" $hi)
+
+    # Print the first three bytes (that are always the same) and the computed last one.
+    # Add a space for correct alignement
+    echo -ne "\xf0\x9f\x95\x$hex "
+}
+
 _lp_time()
 {
     [[ "$LP_ENABLE_TIME" != 1 ]] && return
-    echo -ne "${LP_COLOR_TIME}${_LP_TIME_SYMBOL}${NO_COL}"
+    if [[ "$LP_TIME_ANALOG" != 1 ]]; then
+        echo -ne "${LP_COLOR_TIME}${_LP_TIME_SYMBOL}${NO_COL}"
+    else
+        echo -ne "${LP_COLOR_TIME}$(_lp_time_analog)${NO_COL}"
+    fi
 }
 
 ########################

liquidpromptrc-dist

@@ -95,6 +95,13 @@ LP_ENABLE_BZR=1
 # Recommended value is 0
 LP_ENABLE_TIME=0
 
+# When showing time, use an analog clock instead of numeric values.
+# The analog clock is "accurate" to the nearest half hour.
+# You must have a unicode-capable terminal and a font with the "CLOCK"
+# characters.
+# Recommended value is 0
+LP_TIME_ANALOG=0
+
 # Use the liquid prompt as the title of the terminal window
 # This may not work properly on exotic terminals, thus the
 # recommended value is 0