grep doc: add --break / --heading / -W to synopsis

[git.git] / pager.c

diff --git a/pager.c b/pager.c
index 975955ba82a0dbb128d6733090cd74c2b509ea81..b7909678f459d90d1c8907c78bb5fcb512fe558d 100644 (file)
--- a/pager.c
+++ b/pager.c
@@ -76,6 +76,12 @@ void setup_pager(void)
        if (!pager)
                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 */
@@ -110,3 +116,34 @@ 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;
+}