linenoise: insert previous line command.

* linenoise/linenoise.c (edit): Extended Ctrl-X Ctrl-R/r
command added.

* txr.1: Documented.

2 files changed, 22 insertions, 0 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index de12bdb4..b5b9908f 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -1782,6 +1782,20 @@ static int edit(lino_t *l, const char *prompt)
                     }
                 }
                 break;
+            case CTL('R'): case 'r':
+                extended = 0;
+                if (extend_num < 0)
+                    extend_num = 1;
+                if (l->history_len > extend_num) {
+                    char *prev_line = l->history[l->history_len - 1
+                                                 - extend_num];
+                    int res = edit_insert_str(l, prev_line, strlen(prev_line));
+                    if (res) {
+                        l->error = lino_ioerr;
+                        goto out;
+                    }
+                }
+                break;
             case CTL('Q'):
                 extended = 0;
                 {
diff --git a/txr.1 b/txr.1
index bdfb6b08..b9781641 100644
--- a/txr.1
+++ b/txr.1
@@ -34227,6 +34227,14 @@ Only the most recent three decimal digits are retained, so the number can range
 from 0 to 999. A value of 0, or a value which exceeds the number of words
 causes the Ctrl-A or a to do nothing.
 
+.NP* Insert Previous Line
+
+The command sequences Ctrl-X, Ctrl-R ("repeat") and Ctrl-X, r, which are
+equivalent, insert an entire line of history into the current buffer. By
+default, the previous line is inserted. A less recent line can be selected by
+typing a numeric argument between the Ctrl-X and the Ctrl-R/r. The immediately
+previous history line is numbered 1, the one before it 2 and so on.
+
 .NP* Symbolic Completion
 
 If the Tab key is pressed while editing a line, it is interpreted as a