Add the --explain option to testrunner.tcl.

FossilOrigin-Name: f0c9eb0326f189fe5ebbee83532ac2c413e91c6a8e9d5b93aa6170cba66fdd22

manifest

@@ -1,5 +1,5 @@
-C Improve\sone\sof\sthe\serror\smessages\sfrom\stestrunner.tcl.
-D 2024-03-13T11:46:23.016
+C Add\sthe\s--explain\soption\sto\stestrunner.tcl.
+D 2024-03-13T13:09:58.491
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -1687,7 +1687,7 @@ F test/temptable2.test 76821347810ecc88203e6ef0dd6897b6036ac788e9dd3e6b04fd4d163
 F test/temptable3.test d11a0974e52b347e45ee54ef1923c91ed91e4637
 F test/temptrigger.test 38f0ca479b1822d3117069e014daabcaacefffcc
 F test/tester.tcl fe617b88c7eb08bdf983d2aaa31c20fbf439eee7b8e0d61ca636fcd0c305bbbf
-F test/testrunner.tcl cdbfe4b24952a411fcc2cb48331d10ece650b6a3108bd05ae890304cfed93fed
+F test/testrunner.tcl f172c5141b890acfc223884071f90176031e3a059218280952f536eb2c851ee8
 F test/testrunner_data.tcl 2f94974e5e3a56af880be72f7a7fd239aa9d4ecf978625435fcc698319c927fa
 F test/thread001.test a0985c117eab62c0c65526e9fa5d1360dd1cac5b03bde223902763274ce21899
 F test/thread002.test c24c83408e35ba5a952a3638b7ac03ccdf1ce4409289c54a050ac4c5f1de7502
@@ -2177,8 +2177,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 3128b98d2656c7f23f6071c173f96329c7bdc49cd641050fbb7b105b810ba7c7
-R b30ace34515f0911b2a0db585efbc51d
+P 233155c174575fa99b34030c1936bc2b04489417f4d5223f18cdb3c8fc274a56
+R 73b7b3b0e43269248a0a7f9b5744d286
 U drh
-Z 4fb6ed0f5ce1c12c4ccfa1c6192fc974
+Z bad41bec7a1c5ea3149d7911ab3a6c38
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-233155c174575fa99b34030c1936bc2b04489417f4d5223f18cdb3c8fc274a56
+f0c9eb0326f189fe5ebbee83532ac2c413e91c6a8e9d5b93aa6170cba66fdd22

test/testrunner.tcl

@@ -62,6 +62,7 @@ Usage:
   where SWITCHES are:
     --buildonly
     --dryrun
+    --explain
     --jobs NUMBER-OF-JOBS
     --zipvfs ZIPVFS-SOURCE-DIR
 
@@ -166,6 +167,7 @@ set TRG(fuzztest) 0                 ;# is the fuzztest option present.
 set TRG(zipvfs) ""                  ;# -zipvfs option, if any
 set TRG(buildonly) 0                ;# True if --buildonly option 
 set TRG(dryrun) 0                   ;# True if --dryrun option 
+set TRG(explain) 0                  ;# True for the --explain option
 
 switch -nocase -glob -- $tcl_platform(os) {
   *darwin* {
@@ -460,6 +462,8 @@ for {set ii 0} {$ii < [llength $argv]} {incr ii} {
       set TRG(buildonly) 1
     } elseif {($n>2 && [string match "$a*" --dryrun]) || $a=="-d"} {
       set TRG(dryrun) 1
+    } elseif {($n>2 && [string match "$a*" --explain]) || $a=="-e"} {
+      set TRG(explain) 1
     } else {
       usage
     }
@@ -1177,15 +1181,42 @@ proc handle_buildonly {} {
   }
 }
 
+# Handle the --explain option.  Provide a human-readable
+# explanation of all the tests that are in the trdb database jobs
+# table.
+#
+proc explain_layer {indent depid} {
+  global TRG
+  if {$TRG(buildonly)} {
+    set showtests 0
+  } else {
+    set showtests 1
+  }
+  trdb eval {SELECT jobid, displayname, displaytype, dirname
+               FROM jobs WHERE depid=$depid ORDER BY displayname} {
+    if {$displaytype=="bld"} {
+      puts "${indent}$displayname in $dirname"
+      explain_layer "${indent}   " $jobid
+    } elseif {$showtests} {
+      puts "${indent}[lindex $displayname end]"
+    }
+  }
+}
+proc explain_tests {} {
+  explain_layer "" ""
+}
+
 sqlite3 trdb $TRG(dbname)
 trdb timeout $TRG(timeout)
 set tm [lindex [time { make_new_testset }] 0]
-if {$TRG(nJob)>1} {
-  puts "splitting work across $TRG(nJob) jobs"
+if {$TRG(explain)} {
+  explain_tests
+} else {
+  if {$TRG(nJob)>1} {
+    puts "splitting work across $TRG(nJob) jobs"
+  }
+  puts "built testset in [expr $tm/1000]ms.."
+  handle_buildonly
+  run_testset
 }
-puts "built testset in [expr $tm/1000]ms.."
-
-handle_buildonly
-run_testset
 trdb close
-#puts [pwd]