add __fish_status_to_signal.fish and __fish_pipestatus_with_signal.fish

share/functions/__fish_pipestatus_with_signal.fish

@@ -0,0 +1,5 @@
+function __fish_pipestatus_with_signal --description "Print arguments from \$pipestatus replacing values with signal names where appropriate"
+    for pstat in $argv
+        echo (__fish_status_to_signal $pstat)
+    end
+end

share/functions/__fish_status_to_signal.fish

@@ -0,0 +1,22 @@
+function __fish_status_to_signal --description "Print signal name from argument (\$status), or just argument"
+    if test (count $argv) -ne 1
+        echo "expected single argument as integer from \$status" >&2
+        return 1
+    end
+
+    if test $argv[1] -gt 128
+        set -l signals SIGHUP SIGINT SIGQUIT SIGILL SIGTRAP SIGABRT SIGBUS \
+            SIGFPE SIGKILL SIGUSR1 SIGSEGV SIGUSR2 SIGPIPE SIGALRM \
+            SIGTERM SIGSTKFLT SIGCHLD SIGCONT SIGSTOP SIGTSTP \
+            SIGTTIN SIGTTOU SIGURG SIGXCPU SIGXFSZ SIGVTALRM \
+            SIGPROF SIGWINCH SIGIO SIGPWR SIGSYS
+        set -l sigix (math $argv[1] - 128)
+        if test $sigix -le (count $signals)
+            echo $signals[$sigix]
+            return 0
+        end
+    end
+
+    echo $argv[1]
+    return 0
+end