9 files changed, 57 insertions, 24 deletions

diff --git a/TODO.md b/TODO.md
index a18c068..1bc92e0 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,10 +4,11 @@ This is a list of things that I would like to add or change at some point.
 It's more of a personal reminder than anything else.
 
 ## For version 2.1
-### Memory management
-* freemem command: implement the 5 functions, execute at the end of shell.c
 ### Installation
-* Is it possible to make table generation at least 3x faster?
+* Implement coord->move to apply moves directly on coordinates
+  (can this be used to improve solving speed? Applying moves on
+   three coordinates is better than applying a move on a Cube and
+   then transforming it, but I still need to work with inverses...)
 ### Documentation
 * Write an examples.md file
 * More screenshots!
@@ -55,9 +56,6 @@ including e.g. solutions that were not shown because -c)
 * free pruning table after solve is done? if I do this I need to deafault to a
   small table for < 8 moves solutions or smth
 * improve multi-threading when solving multiple scrambles
-* alternative: just add a command "free" to free up memory; it is not
-  user friendly (who wants to manage memory manually?) but on the other hand
-  it will only be used by the few who have less than 4(?) Gb of ram.
 * nissy -M maxmem option for running with at most maxmem memory; if exceeded
   when loading a pruning table, return failure (or make every solve command
   use tiny tables instead?); if maxmem is very 600Mb or
diff --git a/doc/nissy.1 b/doc/nissy.1
index 124df9b..dfc18ed 100644
--- a/doc/nissy.1
+++ b/doc/nissy.1
@@ -53,6 +53,10 @@ all moves done on inverse.
 .It Nm commands
 List all available commands.
 .
+.It Nm freemem
+Release some large tables from memory. You can use this command in case
+you want to keep nissy open without using too much RAM.
+.
 .It Nm gen Op Fl t Ar N
 Generate all tables used by nissy. Run this to complete your installation.
 If
diff --git a/nissy b/nissy
new file mode 100755
index 0000000..8a20a5d
--- /dev/null
+++ b/nissy
diff --git a/src/commands.c b/src/commands.c
index 1396b69..e704d7a 100644
--- a/src/commands.c
+++ b/src/commands.c
@@ -162,6 +162,7 @@ version_cmd = {
 
 Command *commands[] = {
         &commands_cmd,
+        &freemem_cmd,
         &gen_cmd,
         &help_cmd,
         &invert_cmd,
@@ -508,8 +509,8 @@ gen_exec(CommandArgs *args)
         init_symcoord();
 
         fprintf(stderr, "Generating pruning tables...\n");
-        for (i = 0; allpd[i] != NULL; i++)
-                genptable(allpd[i], args->opts->nthreads);
+        for (i = 0; all_pd[i] != NULL; i++)
+                genptable(all_pd[i], args->opts->nthreads);
 
         fprintf(stderr, "Done!\n");
 }
@@ -547,13 +548,16 @@ commands_exec(CommandArgs *args)
 static void
 freemem_exec(CommandArgs *args)
 {
-/* TODO: implement these functions
-        free_allpd();
-        free_allsd();
-        free_invtables();
-        free_ttables();
-        free_mtables();
-*/
+        int i;
+
+        for (i = 0; all_pd[i] != NULL; i++)
+                free_pd(all_pd[i]);
+
+        for (i = 0; all_sd[i] != NULL; i++)
+                free_sd(all_sd[i]);
+
+        /* TODO: invtables are also large, but for now they are *
+         * statically allocated. Consider releasing those too.  */
 }
 
 static void
diff --git a/src/pruning.c b/src/pruning.c
index 869110f..c66f8d6 100644
--- a/src/pruning.c
+++ b/src/pruning.c
@@ -89,7 +89,7 @@ pd_nxopt31_HTM = {
         .fbmod    = BINOM8ON4,
 };
 
-PruneData * allpd[] = {
+PruneData * all_pd[] = {
         &pd_eofb_HTM,
         &pd_coud_HTM,
         &pd_cornershtr_HTM,
@@ -117,6 +117,15 @@ findchunk(PruneData *pd, int nchunks, uint64_t i)
 }
 
 void
+free_pd(PruneData *pd)
+{
+        if (pd->generated)
+                free(pd->ptable);
+
+        pd->generated = false;
+}
+
+void
 genptable(PruneData *pd, int nthreads)
 {
         bool compact;
diff --git a/src/pruning.h b/src/pruning.h
index df95ea2..6bdbee1 100644
--- a/src/pruning.h
+++ b/src/pruning.h
@@ -14,8 +14,9 @@ extern PruneData        pd_htr_drud;
 extern PruneData        pd_htrfin_htr;
 extern PruneData        pd_nxopt31_HTM;
 
-extern PruneData *      allpd[];
+extern PruneData *      all_pd[];
 
+void        free_pd(PruneData *pd);
 void        genptable(PruneData *pd, int nthreads);
 void        print_ptable(PruneData *pd);
 uint64_t    ptablesize(PruneData *pd);
diff --git a/src/shell.c b/src/shell.c
index 420dc1c..77d5d1d 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -11,10 +11,10 @@ checkfiles()
         char fname[strlen(tabledir)+100];
         int i;
 
-        for (i = 0; allpd[i] != NULL; i++) {
+        for (i = 0; all_pd[i] != NULL; i++) {
                 strcpy(fname, tabledir);
-                strcpy(fname, "/");
-                strcpy(fname, allpd[i]->filename);
+                strcat(fname, "/");
+                strcat(fname, all_pd[i]->filename);
                 if ((f = fopen(fname, "rb")) == NULL)
                         return false;
                 else
@@ -140,14 +140,16 @@ launch(bool batchmode)
 int
 main(int argc, char *argv[])
 {
+        char *closing_cmd[1] = { "freemem" };
+
         init_env();
 
         if (!checkfiles()) {
                 fprintf(stderr,
                         "--- Warning ---\n"
-                        "Some pruning tables are missing or unreadable."
+                        "Some pruning tables are missing or unreadable\n"
                         "You can generate them with `nissy gen -t 4'\n"
-                        "Here `4' is the number of threads. Use more if your"
+                        "Here `4' is the number of threads. Use more if your "
                         "CPU has them, or expect it to take a while.\n"
                         "---------------\n\n"
                 );
@@ -163,7 +165,7 @@ main(int argc, char *argv[])
                 launch(false);
         }
 
-        /* TODO: exec freemem */
+        exec_args(1, closing_cmd);
 
         return 0;
 }
diff --git a/src/symcoord.c b/src/symcoord.c
index 4a737af..c4349f5 100644
--- a/src/symcoord.c
+++ b/src/symcoord.c
@@ -53,7 +53,7 @@ sd_eofbepos_16 = {
         .trans     = trans_group_udfix
 };
 
-static SymData * all_sd[] = {
+SymData * all_sd[] = {
         &sd_cp_16,
         &sd_eofbepos_16,
         NULL
@@ -266,6 +266,18 @@ transfinder_nxopt31(uint64_t ind, Trans *ret)
 
 /* Other functions ***********************************************************/
 
+void
+free_sd(SymData *sd)
+{
+        if (sd->generated) {
+                free(sd->class);
+                free(sd->rep);
+                free(sd->transtorep);
+        }
+
+        sd->generated = false;
+}
+
 static void
 gensym(SymData *sd)
 {
diff --git a/src/symcoord.h b/src/symcoord.h
index a7b71ba..0882bff 100644
--- a/src/symcoord.h
+++ b/src/symcoord.h
@@ -9,6 +9,9 @@ extern Coordinate       coord_drud_sym16;
 extern Coordinate       coord_drudfin_noE_sym16;
 extern Coordinate       coord_nxopt31;
 
+extern SymData          *all_sd[];
+
+void                    free_sd(SymData *sd);
 void                    init_symcoord();
 
 #endif