Ticket #11892: dry.2.patch

src/port/port.1

@@ -235 +235 @@
 In batch and interactive mode, exit on the first error encountered. Otherwise, errors during batch execution are simply reported.
 .It Fl p
 Despite any errors encountered, proceed to process multiple ports and commands.
+.It Fl y
+Perform a dry run. All of the steps to build the ports and their dependencies are computed, but not actually performed. With the verbose flag, every step is reported; otherwise there is just one message per port, which allows you to easily determine the recursive deps of a port (and the order in which they will be built).
 .It Fl t
 enable trace mode debug facilities on platforms that support it (MacOS X). This feature is two-folded. It consists in automatically detecting and reporting undeclared dependencies based on what files the port reads or what programs the port executes. In verbose mode, it will also report unused dependencies for each stage of the port installation. It also consists in forbidding and reporting file creation and file writes outside allowed directories (temporary directories and ${workpath}).
 .El

src/port/port.tcl

@@ -136 +136 @@
         global cmdname
         global action_array
         
-        set syntax { [-bcdfiknopqRstuvx] [-D portdir] [-F cmdfile] action [privopts] [actionflags]
+        set syntax { [-bcdfiknopqRstuvxy] [-D portdir] [-F cmdfile] action [privopts] [actionflags]
 [[portname|pseudo-portname|port-url] [@version] [+-variant]... [option=value]...]...
 }
 
@@ -2249 +2249 @@
                                         c { set global_options(ports_autoclean) yes             }
                                         k { set global_options(ports_autoclean) no              }
                                         t { set global_options(ports_trace) yes                 }
+                                        y { set global_options(ports_dryrun) yes                }
                                         F { # Name a command file to process
                                                 advance
                                                 if {[moreargs]} {

src/port1.0/portutil.tcl

@@ -977 +977 @@
 }
 
 ########### Internal Dependency Manipulation Procedures ###########
+global ports_dry_last_skipped
+set ports_dry_last_skipped ""
 
 proc target_run {ditem} {
-    global target_state_fd portpath portname portversion portrevision portvariants ports_force variations workpath ports_trace PortInfo
+    global target_state_fd portpath portname portversion portrevision portvariants ports_force variations workpath ports_trace PortInfo ports_dryrun ports_dry_last_skipped
     set result 0
     set skipped 0
     set procedure [ditem_key $ditem procedure]
@@ -1048 +1050 @@
                         }
                         
                 }
+
+                # Of course, if this is a dry run, don't do the task:
+                if {[info exists ports_dryrun] && $ports_dryrun == "yes"} {
+                    # only one message per portname
+                    if {$portname != $ports_dry_last_skipped} {
+                            ui_msg "For $portname: skipping $name (dry run)"
+                            set ports_dry_last_skipped $portname
+                    } else {
+                        ui_info "    .. and skipping $name"
+                    }
+                    set skipped 1
+                }
                         
                 # otherwise execute the task.
                 if {$skipped == 0} {