feat: category filter

src/awk/get.awk

@@ -1,4 +1,4 @@
-# Retrieve content from iCalendar file
+# Retrieve content from iCalendar files
 #
 # Mandatory variable: `field`.
 # Name of field to retrieve.
@@ -8,34 +8,42 @@
 # comma-separated values, and empty values are dropped.
 # If `format` is set to "date", then the content is interpreted as
 # a date the output is in the form YYYY-MM-DD.
+#
+# Optional variable: `oneline`.
+# If `oneline` is set, then the all newlines will be replaced by white spaces
 @include "lib/awk/icalendar.awk"
 
 # print content of field `field`
-BEGIN                     { FS = ":"; ORS = ""; regex = "^" field; }
+BEGIN                     { FS = ":"; regex = "^" field; }
+BEGINFILE                 { type = ""; line = ""; }
 /^BEGIN:(VJOURNAL|VTODO)/ { type = $2 }
-/^END:/ && $2 == type     { exit }
-$0 ~ field                { line = $0;                 next; }
+/^END:/ && $2 == type     { nextfile }
+$0 ~ regex                { line = $0;                 next; }
 /^ / && line              { line = line substr($0, 2); next; }
-/^[^ ]/ && line           { exit }
-END {
-  if (!type) { exit }
-  # Process line
-  content = getcontent(line)
-  switch (format) {
-    case "csv" : 
-      split(content, a, ",")
-      for (i in a) {
-        if (a[i])
-          res = res "," a[i]
-      }
-      print substr(res, 2)
-      break
-    case "date" : 
-      if (content)
-        print substr(parse_dt("", content), 1, 10)
-      break
-    default :
-      print content
-      break
+/^[^ ]/ && line           { nextfile }
+ENDFILE {
+  if (type) {
+    # Process line
+    content = getcontent(line)
+    if (oneline)
+      content = singleline(content)
+    switch (format) {
+      case "csv" : 
+        split(content, a, ",")
+        res = ""
+        for (i in a) {
+          if (a[i])
+            res = res "," a[i]
+        }
+        print substr(res, 2)
+        break
+      case "date" : 
+        if (content)
+          print substr(parse_dt("", content), 1, 10)
+        break
+      default :
+        print content
+        break
+    }
   }
 }