Log Viewer: Add text mode option (#3177)

- Add an option to display the log in "Text mode" vs "Table mode".
- In Text Mode, the "Copy" button will copy the log as plain text. In
  Table Mode, the "Copy" button does what it used to do before.
- Hovering the mouse pointer over the log name reveals the full name
- Clicking on the log line still brings up the detail dialog
- You can select the text, and copy / paste it into a text file

---------

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

bundles/org.openhab.ui/web/src/pages/developer/log-viewer.vue

@@ -222,6 +222,10 @@
         <f7-icon v-else f7="exclamationmark_triangle" />
       </f7-link>
       <f7-link icon-f7="pencil" tooltip="Configure highlights" data-popup=".loghighlights-popup" class="popup-open" />
+      <f7-segmented>
+        <f7-button outline small :active="!textMode" icon-f7="table" :icon-size="$theme.aurora ? 20 : 22" class="no-ripple" @click="setTextMode(false)" tooltip="Show logs in a table" />
+        <f7-button outline small :active="textMode" icon-f7="text_justifyleft" :icon-size="$theme.aurora ? 20 : 22" class="no-ripple" @click="setTextMode(true)" tooltip="Show logs as plain text" />
+      </f7-segmented>
       <f7-link icon-f7="gear" tooltip="Configure logging" data-popup=".logsettings-popup" class="popup-open" />
     </f7-toolbar>
 
@@ -330,6 +334,38 @@
   tr.trace
     color rgb(112, 112, 112)
 
+  td.text
+    font-family monospace
+    font-size 0.9em
+    padding-left 4em
+    line-height 1.2em
+    color grey
+    span
+      margin-right 5px
+    .time
+      margin-left -3.2em
+    .level
+      width 3em
+      display inline-block
+      margin-right 0
+    .logger
+      width 20em
+      display inline-block
+      vertical-align middle
+      margin-right 0
+    .msg
+      font-weight bold
+    .error
+      color red
+    .warn
+      color orange
+    .info
+      color green
+    .debug
+      color teal
+    .trace
+      color teal
+
   .disabled-link
     pointer-events none
     opacity 0.5
@@ -398,6 +434,11 @@
 </style>
 
 <script lang="ts">
+import Vue from 'vue'
+import Clipboard from 'v-clipboard'
+
+Vue.use(Clipboard)
+
 import MovablePopupMixin from '@/pages/settings/movable-popup-mixin'
 
 export default {
@@ -419,6 +460,7 @@ export default {
       showErrors: false,
       loadingLoggers: true,
       loggerPackages: [],
+      textMode: localStorage.getItem('openhab.ui:logviewer.textMode') === 'true',
       tableData: [],
       batchUpdatePending: false,
       batchLogs: [],
@@ -554,7 +596,6 @@ export default {
     },
     renderEntry (entity) {
       let tr = document.createElement('tr')
-      tr.className = 'table-rows ' + entity.level.toLowerCase()
       let icon = 'question_diamond'
       switch (entity.level) {
         case 'TRACE':
@@ -573,10 +614,19 @@ export default {
           icon = 'exclamationmark_octagon_fill'
           break
       }
-      tr.innerHTML = '<td class="sticky"><i class="icon f7-icons" style="font-size: 18px;">' + icon + `</i> ${entity.time}<span class="milliseconds">${entity.milliseconds}</span></td>` +
-        `<td class="level">${entity.level}</td>` +
-        `<td class="logger"><span class="logger">${entity.loggerName}</span></td>` +
-        `<td class="nowrap">${this.highlightText(entity.message)}</td>`
+      const levelLowerCased = entity.level.toLowerCase()
+      if (this.textMode) {
+        tr.innerHTML = `<td class="text"><span class="time">${entity.time}${entity.milliseconds}</span>` +
+        `[<span class="level ${levelLowerCased}">${entity.level}</span>] ` +
+        `[<span class="logger" title="${entity.loggerName}">${entity.loggerName}</span>] - ` +
+        `<span class="msg ${levelLowerCased}">${this.highlightText(entity.message)}</span></td>`
+      } else {
+        tr.className = 'table-rows ' + levelLowerCased
+        tr.innerHTML = '<td class="sticky"><i class="icon f7-icons" style="font-size: 18px;">' + icon + `</i> ${entity.time}<span class="milliseconds">${entity.milliseconds}</span></td>` +
+          `<td class="level">${entity.level}</td>` +
+          `<td class="logger"><span class="logger" title="${entity.loggerName}">${entity.loggerName}</span></td>` +
+          `<td class="nowrap">${this.highlightText(entity.message)}</td>`
+      }
       tr.addEventListener('click', () => {
         this.onRowClick(entity.id)
       })
@@ -833,6 +883,21 @@ export default {
       return [headers, ...rows].join('\n')
     },
     copyTableToClipboard () {
+      if (this.textMode) {
+        const logs = this.filteredTableData.map((log) => {
+          return `${log.time}${log.milliseconds} [${log.level}] [${log.loggerName}] - ${log.message}`
+        }).join('\n')
+        // v-clipboard works without https, but it can only copy plain text
+        if (this.$clipboard(logs)) {
+          this.$f7.toast.create({
+            text: 'Table copied as text to clipboard',
+            destroyOnClose: true,
+            closeTimeout: 2000
+          }).open()
+        }
+        return
+      }
+
       const table = this.$refs.dataTable
       if (!table) {
         return
@@ -856,6 +921,7 @@ export default {
         .then(() => {
           this.$f7.toast.create({
             text: 'Table copied as HTML to clipboard',
+            destroyOnClose: true,
             closeTimeout: 2000
           }).open()
         })
@@ -863,6 +929,11 @@ export default {
           console.error('Failed to copy table: ', err)
         })
     },
+    setTextMode (textModeEnabled) {
+      this.textMode = textModeEnabled
+      localStorage.setItem('openhab.ui:logviewer.textMode', this.textMode)
+      this.updateFilter()
+    },
     prefilterHighlights () {
       this.activeHighlights.length = 0
       for (const entry of this.highlightFilters) {