Normalizing long spaces to a tab stop

Experimenting with terminal friendly space normalization where sometimes multiple spaces are used to align content horizontally (with a fixed-width font). When encountering 8 or more consecutive spaces, they are all replaced with a single tab character.

Gemtext allows clients to normalize whitespace as they see fit.

2 files changed, 14 insertions, 0 deletions

diff --git a/src/gmdocument.c b/src/gmdocument.c
index f800f6ed..87b8a22c 100644
--- a/src/gmdocument.c
+++ b/src/gmdocument.c
@@ -967,11 +967,18 @@ static void normalize_GmDocument(iGmDocument *d) {
             continue;
         }
         iBool isPrevSpace = iFalse;
+        int spaceCount = 0;
         for (const char *ch = line.start; ch != line.end; ch++) {
             char c = *ch;
             if (c == '\r') continue;
             if (isNormalizableSpace_(c)) {
                 if (isPrevSpace) {
+                    if (++spaceCount == 8) {
+                        /* There are several consecutive space characters. The author likely
+                           really wants to have some space here, so normalize to a tab stop. */
+                        popBack_Block(&normalized->chars);
+                        pushBack_Block(&normalized->chars, '\t');
+                    }
                     continue; /* skip repeated spaces */
                 }
                 c = ' ';
@@ -979,6 +986,7 @@ static void normalize_GmDocument(iGmDocument *d) {
             }
             else {
                 isPrevSpace = iFalse;
+                spaceCount = 0;
             }
             appendCStrN_String(normalized, &c, 1);
         }
diff --git a/src/ui/text.c b/src/ui/text.c
index 57ecce37..08c89e47 100644
--- a/src/ui/text.c
+++ b/src/ui/text.c
@@ -608,6 +608,12 @@ static iRect run_Font_(iFont *d, enum iRunMode mode, iRangecc text, size_t maxLe
                 prevCh = ch;
                 continue;
             }
+            if (ch == '\t') {
+                const int tabStopWidth = d->height * 8;
+                xpos = pos.x + ((int) ((xpos - pos.x) / tabStopWidth) + 1) * tabStopWidth;
+                prevCh = 0;
+                continue;
+            }
             if (ch == '\r') {
                 const iChar esc = nextChar_(&chPos, text.end);
                 if (mode == draw_RunMode) {