pager: support --header 0,M for column-only freezing

less accepts --header 0,M to freeze columns without header lines.
Handle header_width > 0 independently of header_lines.

diff --git a/lib/pager.c b/lib/pager.c
index 355defaf79681275eb553539052e03c0ed1654f8..c2efb91bcff5d14d3debf16c0d27a638b47a9fd8 100644 (file)
--- a/lib/pager.c
+++ b/lib/pager.c
@@ -68,6 +68,11 @@ static void pager_preexec(void)
                         "%s --header %d,%d",
                         less_env ? less_env : "FRSX",
                         header_lines, header_width);
+       else if (header_width > 0)
+               snprintf(less_val, sizeof(less_val),
+                        "%s --header 0,%d",
+                        less_env ? less_env : "FRSX",
+                        header_width);
        else if (header_lines > 0)
                snprintf(less_val, sizeof(less_val),
                         "%s --header %d",
@@ -269,8 +274,8 @@ void pager_open(void)
  * number of header lines to freeze (typically 1 for table header).
  * The @first_col_width specifies the number of character columns to
  * freeze (width of first column including separator), or 0 to not
- * freeze any column. If @header_lines is 0, no header freezing takes
- * place regardless of @first_col_width.
+ * freeze any column. Either parameter can be 0 independently;
+ * less supports --header 0,M to freeze columns without header lines.
  */
 void pager_open_header(int header_lines, int first_col_width)
 {