New { } commands to reposition middle pane origin.

2 files changed, 26 insertions, 0 deletions

diff --git a/pw.1 b/pw.1
index d12b4a9..e043e0b 100644
--- a/pw.1
+++ b/pw.1
@@ -214,6 +214,20 @@ can be adjusted without affecting what portion of the line it shows,
 independently of any horizontal scrolling adjustments occurring in the right
 pane.
 
+.IP "[\fIcount\fP]\fB{\fP, [\fIcount\fP]\fB}\fP"
+Adjust what portion of line is visible in the middle pane, incrementing
+or decrementing the viewport origin by
+.I count
+characters, defaulting to one, without changing the width.
+The effect is that the content of the middle pane appears to
+scroll horizontally to the right when
+.B }
+is used, or left when
+.B {
+is used.
+When no middle pane is being shown, these commands have no effect other
+than refreshing the display.
+
 .IP "\fBCtrl-I, Tab\fP"
 Toggle the highlighting of separator characters appearing in the line
 display. The when toggled on, the
diff --git a/pw.c b/pw.c
index 41c8516..3bd77fe 100644
--- a/pw.c
+++ b/pw.c
@@ -1233,6 +1233,18 @@ int main(int argc, char **argv)
             pw.vsplit2 = max(0, pw.vsplit2 - (int) cmdcount);
             pw.stat |= stat_force;
             break;
+          case '}':
+            if (cmdcount == UINT_MAX)
+              cmdcount = 1;
+            pw.vs2pos = min((int) maxlen, pw.vs2pos + (int) cmdcount);
+            pw.stat |= stat_force;
+            break;
+          case '{':
+            if (cmdcount == UINT_MAX)
+              cmdcount = 1;
+            pw.vs2pos = max(0, pw.vs2pos - (int) cmdcount);
+            pw.stat |= stat_force;
+            break;
           case ctrl('i'):
             pw.stat ^= stat_hlite;
             pw.stat |= stat_force;