feat(xo-server/logs-cli): can match on missing props

packages/xo-server/src/logs-cli.js

@@ -30,7 +30,7 @@ const getLogs = (db, args) => {
     stream = stream.filter(({ value }) => {
       for (const field of fields) {
         const fieldValue = get(value, field)
-        if (fieldValue === undefined || !args.matchers[field](fieldValue)) {
+        if (!args.matchers[field](fieldValue)) {
           return false
         }
       }
@@ -161,7 +161,7 @@ xo-server-logs [--json] [--limit=<limit>] [--since=<date>] [--until=<date>] [<pa
     <pattern>
       Patterns can be used to filter the entries.
 
-      Patterns have the following format \`<field>=<value>\`/\`<field>\`.
+      Patterns have the following format \`<field>=<value>\`, \`<field>\` or \`!<field>\`.
 
 xo-server-logs --gc
 
@@ -210,20 +210,41 @@ function getArgs() {
       const field = value.slice(0, i)
       const pattern = value.slice(i + 1)
 
-      patterns[pattern]
-        ? patterns[field].push(pattern)
-        : (patterns[field] = [pattern])
-    } else if (!patterns[value]) {
-      patterns[value] = null
+      const fieldPatterns = patterns[field]
+      if (fieldPatterns === undefined) {
+        patterns[field] = [pattern]
+      } else if (Array.isArray(fieldPatterns)) {
+        fieldPatterns.push(pattern)
+      } else {
+        throw new Error('cannot mix existence with equality patterns')
+      }
+    } else {
+      const negate = value[0] === '!'
+      if (negate) {
+        value = value.slice(1)
+      }
+
+      if (patterns[value]) {
+        throw new Error('cannot mix existence with equality patterns')
+      }
+
+      patterns[value] = !negate
     }
   }
 
-  const trueFunction = () => true
+  const mustExists = value => value !== undefined
+  const mustNotExists = value => value === undefined
+
   args.matchers = {}
 
   for (const field in patterns) {
     const values = patterns[field]
-    args.matchers[field] = values === null ? trueFunction : globMatcher(values)
+    args.matchers[field] =
+      values === true
+        ? mustExists
+        : values === false
+        ? mustNotExists
+        : globMatcher(values)
   }
 
   // Warning: minimist makes one array of values if the same option is used many times.