From 77d124139c6e8374eec6f6377d9b5aa64adf0874 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 11 Feb 2024 15:16:25 -0500
Subject: much improvements

---
 ssh-check | 68 ++++++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 46 insertions(+), 22 deletions(-)

diff --git a/ssh-check b/ssh-check
index 6d23b59..1d52fc5 100755
--- a/ssh-check
+++ b/ssh-check
@@ -17,13 +17,20 @@ quietly()
 
 match()
 {
-    local search_text="$1" search_pattern
+    local search_text="$1" search_pattern invert=
     shift
     for search_pattern in "$@"
     do
-        case "$search_text" in
-            $search_pattern) return ;;
-        esac
+        if [[ "$search_pattern" = '!'* ]]
+        then
+            invert=y
+        fi
+        if  (set +e
+            [[ $search_text = ${search_pattern#!} ]]
+            [ $? ${invert:+ !}= 0 ])
+        then
+            return
+        fi
     done
     false
 }
@@ -32,36 +39,53 @@ main()
 {
     local h
     declare -a hosts=()
-    mapfile hosts < "$CFG_FILE"
-    MIN_HOST_FIELD_WIDTH=10
-    host_field_width=$MIN_HOST_FIELD_WIDTH
-    for h in ${hosts[@]}
+    declare -i max_found_host_length=0
+    while read h cmd
     do
-        if [ ${#h} -gt $host_field_width ]
+        if [ ${#h} -gt $max_found_host_length ]
         then
-            host_field_width=${#h}
+            max_found_host_length=${#h}
         fi
-    done
+        hosts+=("$h $cmd")
+    done < "$CFG_FILE"
     while true
     do
         {
-            for h in ${hosts[@]}
+            default_hostcmd=uptime
+            for h in "${hosts[@]}"
             do
-                [ $# = 0 ] || match "$h" "$@" || continue
-
+                host=${h%% *}
+                hostcmd=${h#* }
+                [ "$host" ] || continue
+                [ $# = 0 ] || match "$host" "$@" || continue
                 (
                     #.........."1234567890123456"
-                    successpat=" Success:       %-${host_field_width}s  %s\n"
-                    failurepat="*FAILURE:       %-${host_field_width}s\n"
-                    if command_stdout=$(ssh -n $SSH_OPTIONS \
-                            "$h" -- \
-                            ${REMOTE_COMMAND:-uptime} \
-                            2>/dev/null)
+                    successpat=" Success:       %-${max_found_host_length}s  %s\n"
+                    failurepat="*FAILURE:       %-${max_found_host_length}s  %s\n"
+                    command_stderr=$(mktemp)
+                    if command_stdout=$(ssh -n $SSH_OPTIONS -- \
+                            "$host" \
+                            "${hostcmd:-$default_hostcmd}" \
+                            2>"$command_stderr")
                     then
-                        printf "$successpat" "$h" "${command_stdout# }"
+                        if [ "$hostcmd" ]
+                        then
+                            logtail=${command_stdout: -40 }
+                        else
+                            logtail=${command_stdout: 1 : 40 }
+                        fi
+                        printf "$successpat" "$host" "${logtail@Q}"
                     else
-                        printf "$failurepat" "$h"
+                        REPLY=
+                        while read
+                        do
+                                REPLY=${REPLY%$'\r'}
+                                printf "$failurepat" "$host" "${REPLY@Q}"
+                        done <"$command_stderr" >&2
+                        logtail=${REPLY: -40 }
+                        printf "$failurepat" "$host" "${logtail@Q}"
                     fi
+                    rm "$command_stderr"
                 ) &
             done
             wait
-- 
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