cat-file: split --batch input lines on whitespace

diff --git a/pager.c b/pager.c
index 975955ba82a0dbb128d6733090cd74c2b509ea81..c1ecf657fdb32c1fa669f08ba33e358f15c5a07b 100644 (file)
--- a/pager.c
+++ b/pager.c
@@ -6,26 +6,17 @@
 #define DEFAULT_PAGER "less"
 #endif
 
+struct pager_config {
+       const char *cmd;
+       int want;
+       char *value;
+};
+
 /*
  * This is split up from the rest of git so that we can do
  * something different on Windows.
  */
 
-#ifndef WIN32
-static void pager_preexec(void)
-{
-       /*
-        * Work around bug in "less" by not starting it until we
-        * have real input
-        */
-       fd_set in;
-
-       FD_ZERO(&in);
-       FD_SET(0, &in);
-       select(1, &in, NULL, &in, NULL);
-}
-#endif
-
 static const char *pager_argv[] = { NULL, NULL };
 static struct child_process pager_process;
 
@@ -73,9 +64,15 @@ void setup_pager(void)
 {
        const char *pager = git_pager(isatty(1));
 
-       if (!pager)
+       if (!pager || pager_in_use())
                return;
 
+       /*
+        * force computing the width of the terminal before we redirect
+        * the standard output to the pager.
+        */
+       (void) term_columns();
+
        setenv("GIT_PAGER_IN_USE", "true", 1);
 
        /* spawn the pager */
@@ -87,9 +84,6 @@ void setup_pager(void)
                static const char *env[] = { "LESS=FRSX", NULL };
                pager_process.env = env;
        }
-#ifndef WIN32
-       pager_process.preexec_cb = pager_preexec;
-#endif
        if (start_command(&pager_process))
                return;
 
@@ -110,3 +104,74 @@ int pager_in_use(void)
        env = getenv("GIT_PAGER_IN_USE");
        return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
 }
+
+/*
+ * Return cached value (if set) or $COLUMNS environment variable (if
+ * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
+ * and default to 80 if all else fails.
+ */
+int term_columns(void)
+{
+       static int term_columns_at_startup;
+
+       char *col_string;
+       int n_cols;
+
+       if (term_columns_at_startup)
+               return term_columns_at_startup;
+
+       term_columns_at_startup = 80;
+
+       col_string = getenv("COLUMNS");
+       if (col_string && (n_cols = atoi(col_string)) > 0)
+               term_columns_at_startup = n_cols;
+#ifdef TIOCGWINSZ
+       else {
+               struct winsize ws;
+               if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col)
+                       term_columns_at_startup = ws.ws_col;
+       }
+#endif
+
+       return term_columns_at_startup;
+}
+
+/*
+ * How many columns do we need to show this number in decimal?
+ */
+int decimal_width(int number)
+{
+       int i, width;
+
+       for (width = 1, i = 10; i <= number; width++)
+               i *= 10;
+       return width;
+}
+
+static int pager_command_config(const char *var, const char *value, void *data)
+{
+       struct pager_config *c = data;
+       if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) {
+               int b = git_config_maybe_bool(var, value);
+               if (b >= 0)
+                       c->want = b;
+               else {
+                       c->want = 1;
+                       c->value = xstrdup(value);
+               }
+       }
+       return 0;
+}
+
+/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
+int check_pager_config(const char *cmd)
+{
+       struct pager_config c;
+       c.cmd = cmd;
+       c.want = -1;
+       c.value = NULL;
+       git_config(pager_command_config, &c);
+       if (c.value)
+               pager_program = c.value;
+       return c.want;
+}