[geary] Add a bunch of debug statements for search term handling. Bug 766837.

[Michael Gratton <mjog src gnome org>]

commit 95e1cd5e46fef3eafc23aae7bca960eebbc2de0b
Author: Michael James Gratton <mike vee net>
Date:   Tue May 31 17:49:43 2016 +1000

    Add a bunch of debug statements for search term handling. Bug 766837.

 src/engine/api/geary-search-query.vala  |    4 ++++
 src/engine/imap-db/imap-db-account.vala |   30 +++++++++++++++++++++++++-----
 2 files changed, 29 insertions(+), 5 deletions(-)
---
diff --git a/src/engine/api/geary-search-query.vala b/src/engine/api/geary-search-query.vala
index 99de32f..a4d4456 100644
--- a/src/engine/api/geary-search-query.vala
+++ b/src/engine/api/geary-search-query.vala
@@ -64,5 +64,9 @@ public abstract class Geary.SearchQuery : BaseObject {
         this.raw = raw;
         this.strategy = strategy;
     }
+
+    public string to_string() {
+        return "\"%s\" (%s)".printf(this.raw, this.strategy.to_string());
+    }
 }
 
diff --git a/src/engine/imap-db/imap-db-account.vala b/src/engine/imap-db/imap-db-account.vala
index af72b54..86689db 100644
--- a/src/engine/imap-db/imap-db-account.vala
+++ b/src/engine/imap-db/imap-db-account.vala
@@ -1139,16 +1139,34 @@ private class Geary.ImapDB.Account : BaseObject {
         int limit = 100, int offset = 0, Gee.Collection<Geary.FolderPath?>? folder_blacklist = null,
         Gee.Collection<Geary.EmailIdentifier>? search_ids = null, Cancellable? cancellable = null)
         throws Error {
+
+        debug("Search: %s", q.to_string());
+
         check_open();
         ImapDB.SearchQuery query = check_search_query(q);
-        
+
         Gee.HashMap<string, string> query_phrases = get_query_phrases(query);
-        
         Gee.Map<Geary.NamedFlag, bool> removal_conditions = get_removal_conditions(query);
-        
         if (query_phrases.size == 0 && removal_conditions.is_empty)
             return null;
-        
+
+        foreach (string? field in query.get_fields()) {
+            debug(" - Field \"%s\" terms:", field);
+            foreach (SearchTerm? term in query.get_search_terms(field)) {
+                if (term != null) {
+                    debug("    - \"%s\": %s, %s",
+                          term.original,
+                          term.parsed,
+                          term.stemmed
+                    );
+                    debug("      SQL terms:");
+                    foreach (string sql in term.sql) {
+                        debug("       - \"%s\"", sql);
+                    }
+                }
+            }
+        }
+
         // Do this outside of transaction to catch invalid search ids up-front
         string? search_ids_sql = get_search_ids_sql(search_ids);
         
@@ -1167,7 +1185,9 @@ private class Geary.ImapDB.Account : BaseObject {
             strip_results = false;
         else if (traverse<SearchTerm>(query.get_all_terms()).any(term => term.stemmed == null || 
term.is_exact))
             strip_results = false;
-        
+
+        debug(strip_results ? "Stripping results..." : "Not stripping results...");
+
         Gee.Set<ImapDB.EmailIdentifier> unstripped_ids = new Gee.HashSet<ImapDB.EmailIdentifier>();
         Gee.Map<ImapDB.EmailIdentifier, Gee.Set<string>>? search_results = null;