AlignCommodity and Incoming

1 files changed, 38 insertions, 0 deletions

diff --git a/autoload/beancount.vim b/autoload/beancount.vim
new file mode 100644
index 0000000..85adc3e
--- /dev/null
+++ b/autoload/beancount.vim
@@ -0,0 +1,38 @@
+" Align currency on decimal point.
+function! beancount#align_commodity(line1, line2)
+    " Saving cursor position to adjust it if necessary.
+    let cursor_col = col('.')
+    let cursor_line = line('.')
+    " This matches the line up to the first dot (or other separator),
+    " excluding comments.
+    " Note very nomagic so that the separator is not interpreted as regex.
+    let separator_regex = '^\V\[^;]\{-}' . g:beancount_decimal_separator
+    " This lets me increment at start of loop, because of continue statements.
+    let i = a:line1 - 1
+    while i < a:line2
+        let i += 1
+        let s = getline(i)
+        " This matches an account name followed by a space. There may be
+        " some conflicts with non-transaction syntax that I don't know about.
+        " It won't match a comment or any non-indented line.
+        let end_acc = matchend(s, '^\v([-\d]+\s+(balance|price))? +\S+ ')
+        if end_acc < 0 | continue | endif
+        " Where does commodity amount begin?
+        let end_space = matchend(s, '^ *', end_acc)
+        " Find the first decimal point, not counting comments.
+        let separator = matchend(s, separator_regex, end_space)
+        if separator < 0
+            " If there is no separator, pretend there's one after the last digit.
+            let separator = matchend(s, '^\v[^;]*\d+') + 1
+        endif
+        if separator < 0 | continue | endif
+        let has_spaces = end_space - end_acc
+        let need_spaces = g:beancount_separator_col - separator + has_spaces
+        if need_spaces < 0 | continue | endif
+        call setline(i, s[0 : end_acc - 1] . repeat(" ", need_spaces) . s[ end_space : -1])
+        if i == cursor_line && cursor_col >= end_acc
+            " Adjust cursor position for continuity.
+            call cursor(0, cursor_col + need_spaces - has_spaces)
+        endif
+    endwhile
+endfunction