pty: install the terminfo entry implicitly when it is missing everywhere

The lookup miss now writes the embedded entry to ~/.terminfo and
uses it, so a bare box gets the full TERM with no step at all. An
entry that exists anywhere is respected -- possibly newer, certainly
somebody's -- and a HOME that cannot be written leaves the
xterm-256color fallback standing. --install-terminfo stays as the
by-hand spelling; the writer moved to pty.c where the panes are.

1 files changed, 8 insertions, 48 deletions

diff --git a/src/main.c b/src/main.c
index 3fdbfe6..838d6f7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -26,58 +26,18 @@
 #include "version.h"
 
 #ifndef _WIN32
-#include <errno.h>
-#include <sys/stat.h>
-
-#include "terminfo.h"
-
-/* Write the embedded xterm-ghostty terminfo entry into ~/.terminfo, which
- * is the first place curses looks: no root, no package, no conflict with a
- * ghostty the machine may install later (its own entry in the system
- * database simply stops being needed). Written under every name the entry
- * answers to, in the letter layout and Darwin's hashed one, because the
- * lookup is by filename. */
+/* The write itself lives in pty.c (pty_terminfo_install), because panes do
+ * it on their own when the entry is missing everywhere. This flag is the
+ * by-hand spelling, with a report around it. */
 static int install_terminfo(void) {
-  const char *home = getenv("HOME");
-  if (!home || !*home) {
-    fputs("slosh: no $HOME to install into\n", stderr);
+  if (pty_terminfo_install() != 0) {
+    fputs("slosh: could not write ~/.terminfo (no $HOME, or not writable)\n",
+          stderr);
     return 1;
   }
-  /* dir, then name inside it: x/ and 78/ for xterm-ghostty, g/ and 67/ for
-   * the ghostty alias. */
-  static const char *const spots[][2] = {
-      {"x", "xterm-ghostty"},
-      {"78", "xterm-ghostty"},
-      {"g", "ghostty"},
-      {"67", "ghostty"},
-  };
-  char path[1024];
-  snprintf(path, sizeof path, "%s/.terminfo", home);
-  if (mkdir(path, 0755) != 0 && errno != EEXIST) {
-    fprintf(stderr, "slosh: mkdir %s: %s\n", path, strerror(errno));
-    return 1;
-  }
-  for (size_t i = 0; i < sizeof spots / sizeof *spots; i++) {
-    snprintf(path, sizeof path, "%s/.terminfo/%s", home, spots[i][0]);
-    if (mkdir(path, 0755) != 0 && errno != EEXIST) {
-      fprintf(stderr, "slosh: mkdir %s: %s\n", path, strerror(errno));
-      return 1;
-    }
-    snprintf(path, sizeof path, "%s/.terminfo/%s/%s", home, spots[i][0],
-             spots[i][1]);
-    FILE *f = fopen(path, "wb");
-    if (!f || fwrite(TERMINFO_GHOSTTY, 1, sizeof TERMINFO_GHOSTTY, f) !=
-                  sizeof TERMINFO_GHOSTTY) {
-      fprintf(stderr, "slosh: write %s: %s\n", path, strerror(errno));
-      if (f) fclose(f);
-      return 1;
-    }
-    fclose(f);
-  }
-  printf("installed xterm-ghostty (and the ghostty alias) into %s/.terminfo\n"
+  printf("installed xterm-ghostty (and the ghostty alias) into ~/.terminfo\n"
          "new sessions use it; a session already running keeps the TERM it\n"
-         "chose at startup until it is restarted\n",
-         home);
+         "chose at startup until it is restarted\n");
   return 0;
 }
 #endif