Launcher: Added launcher completion.

src/launcher.c

@@ -31,6 +31,8 @@
 */
 
 #include "wmfs.h"
+#include <dirent.h>
+#include <limits.h>
 
 void
 launcher_execute(Launcher launcher)
@@ -39,7 +41,18 @@ launcher_execute(Launcher launcher)
      KeySym ks;
      char tmp[32] = { 0 };
      char buf[512] = { 0 };
+     char tabbuf[512] = { 0 };
      int pos = 0;
+     DIR           *dir;
+     struct dirent *dirent;
+     char *searchpath;
+     char *start, *end;
+     Bool stop, found;
+     char currentpath[PATH_MAX];
+     Bool lastwastab = False;
+     int tabhits = 0;
+     int searchhits = 0;
+
      BarWindow *bw;
      Bool my_guitar_gently_wheeps = True;
 
@@ -84,11 +97,85 @@ launcher_execute(Launcher launcher)
                case XK_Escape:
                     my_guitar_gently_wheeps = 0;
                     break;
+               case XK_Tab:
+                    stop = False;
+                    found = False;
+
+                    searchpath = getenv("PATH");
+                    start = searchpath;
+
+                    if (lastwastab)
+                    {
+                       strcpy(buf, tabbuf);
+                       tabhits++;
+                    }
+                    else
+                    {
+                       tabhits = 1;
+                    }
+                    searchhits = 0;
+
+                    do
+                    {
+                       end = strchr(start, ':');
+                       if (end == NULL)
+                       {
+                          stop = True;
+                          strncpy(currentpath, start, PATH_MAX);
+                       }
+                       else
+                       {
+                          strncpy(currentpath, start, end - start);
+                          currentpath[end - start] = '\0';
+                       }
+                       if (!stop)
+                       {
+                          start = end + 1;
+                       }
+
+
+                       dir = opendir(currentpath);
+                       if (dir)
+                       {
+                          while ((dirent = readdir(dir)) != NULL)
+                          {
+                             if (!strncmp(dirent->d_name, buf, strlen(buf)))
+                             {
+                                searchhits++;
+                                if (searchhits == tabhits)
+                                {
+                                   strcpy(tabbuf, buf);
+                                   strcpy(buf, dirent->d_name);
+                                   pos = strlen(dirent->d_name);
+                                   buf[pos] = '\0';
+                                   found = True;
+                                   stop = True;
+                                }
+                             }
+                          }
+
+                          closedir(dir);
+                       }
+                    }
+                    while (!stop);
+
+                    lastwastab = True;
+
+                    if (!found)
+                    {
+                       tabhits = 0; /* start a new round of tabbing */
+                    }
+                    pos = strlen(buf);
+
+                    break;
+
                case XK_BackSpace:
+                    lastwastab = False;
                     if(pos)
                          buf[--pos] = 0;
                     break;
                default:
+                    lastwastab = False;
                     strncat(buf, tmp, sizeof(buf));
                     ++pos;
                     break;