Allow lambda expression to be indented.

diff --git a/pret-lam.lua b/pret-lam.lua
index 68db5772120fcf8716ada9e40b3f612a43986747..6935043297ee5077a9e77495187b4ad0623e7662 100644 (file)
--- a/pret-lam.lua
+++ b/pret-lam.lua
@@ -43,6 +43,10 @@ local submatches = {}
 local bases = {}
 -- Store the last line for each indent level
 local indentlines = {}
+-- The amount of indent of the first line, which we will strip of all
+-- subsequent lines. This allows the entire block to be indented as normal in
+-- the tex source code.
+local first_indent
 
 -- See if str starts with a symbol, and return the remaining string and that
 -- symbol. If no symbol from the table is matched, just returns the first
@@ -129,6 +133,17 @@ end
 --   line4, and line is no longer in scope since it is replaced by line4.
 local function do_indent(line)
     newind, rest = utf.match(line, '^(%s*)(.*)')
+  
+    -- Store the first line's indent
+    if not first_indent then 
+        first_indent = utf.len(newind)
+    end
+
+    -- Strip the indent of the first line from this line's indent.
+    newind = utf.sub(newind, first_indent + 1) 
+    -- Rebuild line, so we can still use it below
+    line = newind .. rest
+
     prev = -1
     -- Loop all the previous lines
     for indent, unused in pairs(indentlines) do
@@ -199,6 +214,7 @@ function vis.begin_of_display()
         bases = {}
     end
     indentlines = {}
+    first_indent = nil
 end