z: upgrade plugin to the latest version (#9310)

Commit-id: 125f4dc47e15891739dd8262d5b23077fe8fb9ab
https://github.com/rupa/z/commit/125f4dc47e15891739dd8262d5b23077fe8fb9ab

plugins/z/README

@@ -23,6 +23,8 @@ DESCRIPTION
 OPTIONS
        -c     restrict matches to subdirectories of the current directory
 
+       -e     echo the best match, don't cd
+
        -h     show a brief help message
 
        -l     list only
@@ -57,6 +59,8 @@ NOTES
        Optionally:
               Set $_Z_CMD to change the command name (default z).
               Set $_Z_DATA to change the datafile (default $HOME/.z).
+              Set  $_Z_MAX_SCORE  lower  to  age  entries  out faster (default
+              9000).
               Set $_Z_NO_RESOLVE_SYMLINKS to prevent symlink resolution.
               Set $_Z_NO_PROMPT_COMMAND to handle PROMPT_COMMAND/precmd  your-
               self.
@@ -64,8 +68,8 @@ NOTES
               Set $_Z_OWNER to allow usage when in 'sudo -s' mode.
               (These  settings  should  go  in  .bashrc/.zshrc before the line
               added above.)
-              Install   the   provided   man   page   z.1    somewhere    like
-              /usr/local/man/man1.
+              Install the provided man page z.1  somewhere  in  your  MANPATH,
+              like /usr/local/man/man1.
 
    Aging:
        The rank of directories maintained by z undergoes aging based on a sim-

plugins/z/z.1

@@ -78,6 +78,9 @@ Set \fB$_Z_CMD\fR to change the command name (default \fBz\fR).
 Set \fB$_Z_DATA\fR to change the datafile (default \fB$HOME/.z\fR).
 .RE
 .RS
+Set \fB$_Z_MAX_SCORE\fR lower to age entries out faster (default \fB9000\fR).
+.RE
+.RS
 Set \fB$_Z_NO_RESOLVE_SYMLINKS\fR to prevent symlink resolution.
 .RE
 .RS

plugins/z/z.sh

@@ -10,6 +10,7 @@
 #     * optionally:
 #         set $_Z_CMD in .bashrc/.zshrc to change the command (default z).
 #         set $_Z_DATA in .bashrc/.zshrc to change the datafile (default ~/.z).
+#         set $_Z_MAX_SCORE lower to age entries out faster (default 9000).
 #         set $_Z_NO_RESOLVE_SYMLINKS to prevent symlink resolution.
 #         set $_Z_NO_PROMPT_COMMAND if you're handling PROMPT_COMMAND yourself.
 #         set $_Z_EXCLUDE_DIRS to an array of directories to exclude.
@@ -23,6 +24,8 @@
 #     * z -l foo  # list matches instead of cd
 #     * z -e foo  # echo the best match, don't cd
 #     * z -c foo  # restrict matches to subdirs of $PWD
+#     * z -x      # remove the current directory from the datafile
+#     * z -h      # show a brief help message
 
 [ -d "${_Z_DATA:-$HOME/.z}" ] && {
     echo "ERROR: z.sh's datafile (${_Z_DATA:-$HOME/.z}) is a directory."
@@ -62,7 +65,8 @@ _z() {
 
         # maintain the data file
         local tempfile="$datafile.$RANDOM"
-        _z_dirs | awk -v path="$*" -v now="$(date +%s)" -F"|" '
+        local score=${_Z_MAX_SCORE:-9000}
+        _z_dirs | awk -v path="$*" -v now="$(date +%s)" -v score=$score -F"|" '
             BEGIN {
                 rank[path] = 1
                 time[path] = now
@@ -79,7 +83,7 @@ _z() {
                 count += $2
             }
             END {
-                if( count > 9000 ) {
+                if( count > score ) {
                     # aging
                     for( x in rank ) print x "|" 0.99*rank[x] "|" time[x]
                 } else for( x in rank ) print x "|" rank[x] "|" time[x]
@@ -140,25 +144,22 @@ _z() {
             function frecent(rank, time) {
               # relate frequency and time
               dx = t - time
-                if( dx < 3600 ) return rank * 4
-                if( dx < 86400 ) return rank * 2
-                if( dx < 604800 ) return rank / 2
-                return rank / 4
+              return int(10000 * rank * (3.75/((0.0001 * dx + 1) + 0.25)))
             }
             function output(matches, best_match, common) {
                 # list or return the desired directory
                 if( list ) {
-                    cmd = "sort -g >&2"
+                    if( common ) {
+                        printf "%-10s %s\n", "common:", common > "/dev/stderr"
+                    }
+                    cmd = "sort -n >&2"
                     for( x in matches ) {
                         if( matches[x] ) {
                             printf "%-10s %s\n", matches[x], x | cmd
                         }
                     }
-                    if( common ) {
-                        printf "%-10s %s\n", "common:", common > "/dev/stderr"
-                    }
                 } else {
-                    if( common ) best_match = common
+                    if( common && !typ ) best_match = common
                     print best_match
                 }
             }
@@ -200,15 +201,22 @@ _z() {
                 # prefer case sensitive
                 if( best_match ) {
                     output(matches, best_match, common(matches))
+                    exit
                 } else if( ibest_match ) {
                     output(imatches, ibest_match, common(imatches))
+                    exit
                 }
+                exit(1)
             }
         ')"
 
-        [ $? -eq 0 ] && [ "$cd" ] && {
+        if [ "$?" -eq 0 ]; then
+          if [ "$cd" ]; then
             if [ "$echo" ]; then echo "$cd"; else builtin cd "$cd"; fi
-        }
+          fi
+        else
+          return $?
+        fi
     fi
 }
 
@@ -223,15 +231,11 @@ if type compctl >/dev/null 2>&1; then
         if [ "$_Z_NO_RESOLVE_SYMLINKS" ]; then
             _z_precmd() {
                 (_z --add "${PWD:a}" &)
-                # Reference $RANDOM to refresh its value inside the subshell
-                # Otherwise, multiple runs get the same value
                 : $RANDOM
             }
         else
             _z_precmd() {
                 (_z --add "${PWD:A}" &)
-                # Reference $RANDOM to refresh its value inside the subshell
-                # Otherwise, multiple runs get the same value
                 : $RANDOM
             }
         fi