users/11568: use UTF-8 characters in some prompt themes

8 files changed, 62 insertions, 31 deletions

diff --git a/Functions/Prompts/.distfiles b/Functions/Prompts/.distfiles
index 758c28594..8d2a8f117 100644
--- a/Functions/Prompts/.distfiles
+++ b/Functions/Prompts/.distfiles
@@ -6,4 +6,5 @@ prompt_bart_setup     prompt_fire_setup     prompt_zefram_setup
 prompt_bigfade_setup  prompt_off_setup      promptinit
 prompt_elite2_setup   prompt_oliver_setup   prompt_clint_setup
 prompt_walters_setup
+prompt_special_chars
 '
diff --git a/Functions/Prompts/prompt_adam2_setup b/Functions/Prompts/prompt_adam2_setup
index e36b1475c..612cb8958 100644
--- a/Functions/Prompts/prompt_adam2_setup
+++ b/Functions/Prompts/prompt_adam2_setup
@@ -10,8 +10,8 @@ where the colors are for the hyphens, current directory, user@host,
 and user input bits respectively.  The default colors are cyan, green,
 cyan, and white.  This theme works best with a dark background.
 
-If you have the `nexus' or `vga' console fonts or similar, you
-can specify the `8bit' option to use 8-bit replacements for the
+If you have either UTF-8 or the `nexus' or `vga' console fonts or similar,
+you can specify the `8bit' option to use 8-bit replacements for the
 7-bit characters.
 
 And you probably thought adam1 was overkill ...
@@ -24,10 +24,17 @@ prompt_adam2_setup () {
 
   if [[ $1 == '8bit' ]]; then
     shift
-    prompt_gfx_tlc=$'\xda'
-    prompt_gfx_mlc=$'\xc3'
-    prompt_gfx_blc=$'\xc0'
-    prompt_gfx_hyphen=$'\xc4'
+    if [[ ${LC_ALL:-${LC_CTYPE:-$LANG}} = *UTF-8* ]]; then
+      prompt_gfx_tlc=$'\xe2\x94\x8c'
+      prompt_gfx_mlc=$'\xe2\x94\x9c'
+      prompt_gfx_blc=$'\xe2\x94\x94'
+      prompt_gfx_hyphen=$'\xe2\x94\x80'
+    else
+      prompt_gfx_tlc=$'\xda'
+      prompt_gfx_mlc=$'\xc3'
+      prompt_gfx_blc=$'\xc0'
+      prompt_gfx_hyphen=$'\xc4'
+    fi
   else
     prompt_gfx_tlc='.'
     prompt_gfx_mlc='|'
diff --git a/Functions/Prompts/prompt_bigfade_setup b/Functions/Prompts/prompt_bigfade_setup
index 3b73c1e0f..89ae44981 100644
--- a/Functions/Prompts/prompt_bigfade_setup
+++ b/Functions/Prompts/prompt_bigfade_setup
@@ -14,8 +14,10 @@ date text, and current working directory respectively.  The default
 colors are blue, white, white, and yellow.  This theme works best with
 a dark background.
 
-Recommended fonts for this theme: nexus or vga or similar.  If you
-don't have any of these, the 8-bit characters will probably look stupid.
+
+Recommended fonts for this theme: either UTF-8, or nexus or vga or similar.
+If you don't have any of these, the 8-bit characters will probably look
+stupid.
 EOH
 }
 
@@ -25,9 +27,9 @@ prompt_bigfade_setup () {
   local date=${3:-'white'}
   local cwd=${4:-'yellow'}
 
-  for code in 333 262 261 260; do
-    local char_$code=$(echo -n "\\0$code")
-  done
+  local char_333 char_262 char_261 char_260
+  autoload -U prompt_special_chars
+  prompt_special_chars
 
   PS1="%{$bold_color$fg[$fadebar]$bold_color%}$char_333$char_262$char_261$char_260%{$bold_color$fg[$userhost]$bg[$fadebar]%}%n@%m%{$reset_color$fg[$fadebar]$bg[grey]%}$char_260$char_261$char_262$char_333%{$reset_color$fg[$fadebar]$bg[grey]%}$char_333$char_262$char_261$char_260%{$bold_color$fg[$date]$bg[grey]%} %D{%a %b %d} %D{%I:%M:%S%P}$prompt_newline%{$bold_color$fg[$cwd]$bg[grey]%}$PWD>%{$reset_color%} "
   PS2="%{$bold_color$fg[$fadebar]$bold_color%}$char_333$char_262$char_261$char_260%{$reset_color$fg[$fadebar]$bg[grey]%}$char_260$char_261$char_262$char_333%{$reset_color$fg[$fadebar]$bg[grey]%}$char_333$char_262$char_261$char_260%{$bold_color$bold_color$fg[$fadebar]%}>%{$reset_color%} "
diff --git a/Functions/Prompts/prompt_elite2_setup b/Functions/Prompts/prompt_elite2_setup
index 41080187b..0c1500a16 100644
--- a/Functions/Prompts/prompt_elite2_setup
+++ b/Functions/Prompts/prompt_elite2_setup
@@ -11,8 +11,9 @@ This prompt is color-scheme-able.  You can invoke it thus:
 The default colors are both cyan.  This theme works best with a dark
 background.
 
-Recommended fonts for this theme: nexus or vga or similar.  If you
-don't have any of these, the 8-bit characters will probably look stupid.
+Recommended fonts for this theme: either UTF-8, or nexus or vga or similar.
+If you don't have any of these, the 8-bit characters will probably look
+stupid.
 EOH
 }
 
@@ -20,9 +21,9 @@ prompt_elite2_setup () {
   local text_col=${1:-'cyan'}
   local parens_col=${2:-$text_col}
 
-  for code in 332 304 300; do
-    local char_$code=$(echo -n "\\0$code")
-  done
+  local char_333 char_262 char_261 char_260
+  autoload -U prompt_special_chars
+  prompt_special_chars
 
   local text="%{$fg_no_bold[$text_col]%}"
   local parens="%{$fg_bold[$parens_col]%}"
diff --git a/Functions/Prompts/prompt_elite_setup b/Functions/Prompts/prompt_elite_setup
index 53216c52a..89e9bffdf 100644
--- a/Functions/Prompts/prompt_elite_setup
+++ b/Functions/Prompts/prompt_elite_setup
@@ -11,8 +11,9 @@ This prompt is color-scheme-able.  You can invoke it thus:
 The default colors are red and blue respectively.  This theme is
 intended for use with a black background.
 
-Recommended fonts for this theme: nexus or vga or similar.  If you
-don't have any of these, the 8-bit characters will probably look stupid.
+Recommended fonts for this theme: either UTF-8, or nexus or vga or similar.
+If you don't have any of these, the 8-bit characters will probably look
+stupid.
 EOH
 }
 
@@ -20,9 +21,9 @@ prompt_elite_setup () {
   local text=${1:-'red'}
   local punctuation=${2:-'blue'}
 
-  for code in 332 304 371 372 300; do
-    local char_$code=$(echo -n "\\0$code")
-  done
+  local char_333 char_262 char_261 char_260
+  autoload -U prompt_special_chars
+  prompt_special_chars
 
   PS1="%{$fg[$text]%}$char_332$char_304%{$fg[$punctuation]%}(%{$fg[$text]%}%n%{$fg[$punctuation]%}@%{$fg[$text]%}%m%{$fg[$punctuation]%})%{$fg[$text]%}-%{$fg[$punctuation]%}(%{$fg[$text]%}%D{%I:%M%P}%{$fg[$punctuation]%}-:-%{$fg[$text]%}%D{%m}%{$fg[$punctuation]$fg[$text]%}/%D{%d}%{$fg[$punctuation]%})%{$fg[$text]%}$char_304-%{$fg[$punctuation]]%}$char_371%{$fg[$text]%}-$char_371$char_371%{$fg[$punctuation]%}$char_372$prompt_newline%{$fg[$text]%}$char_300$char_304%{$fg[$punctuation]%}(%{$fg[$text]%}%1~%{$fg[$punctuation]%})%{$fg[$text]%}$char_304$char_371%{$fg[$punctuation]%}$char_372%{$reset_color%}"
   PS2="> "
diff --git a/Functions/Prompts/prompt_fade_setup b/Functions/Prompts/prompt_fade_setup
index ab908e41e..10b27f164 100644
--- a/Functions/Prompts/prompt_fade_setup
+++ b/Functions/Prompts/prompt_fade_setup
@@ -14,8 +14,8 @@ working directory, user@host text, and date text respectively.  The
 default colors are green, white, and white.  This theme works best
 with a dark background.
 
-Recommended fonts for this theme: nexus or vga or similar.  If you
-don't have any of these, the 8-bit characters will probably look
+Recommended fonts for this theme: either UTF-8, or nexus or vga or similar.
+If you don't have any of these, the 8-bit characters will probably look
 stupid.
 EOH
 }
@@ -27,9 +27,9 @@ prompt_fade_setup () {
   local userhost=${2:-'white'}
   local date=${3:-'white'}
 
-  for code in 333 262 261 260; do
-    local char_$code=$(echo -n "\\0$code")
-  done
+  local char_333 char_262 char_261 char_260
+  autoload -U prompt_special_chars
+  prompt_special_chars
 
   PS1="%{$fg[$fadebar_cwd]$bg[$fadebar_cwd]$bold_color%}$char_333$char_262$char_261$char_260%{$fg[$userhost]$bg[$fadebar_cwd]$bold_color%}%n@%m%{$reset_color$fg[$fadebar_cwd]$bg[grey]%}$char_333$char_262$char_261$char_260%{$fg[$date]$bg[grey]$bold_color%} %D{%a %b %d} %D{%I:%M:%S%P} $prompt_newline%{$fg[$fadebar_cwd]$bg[grey]$bold_color%}%~/%{$reset_color%} "
   PS2="%{$fg[$fadebar_cwd]$bg[grey]%}$char_333$char_262$char_261$char_260%{$reset_color%}>"
diff --git a/Functions/Prompts/prompt_fire_setup b/Functions/Prompts/prompt_fire_setup
index 34676d159..039e41e4a 100644
--- a/Functions/Prompts/prompt_fire_setup
+++ b/Functions/Prompts/prompt_fire_setup
@@ -15,8 +15,9 @@ user@host text, date text, and current working directory respectively.
 The default colors are yellow, yellow, red, white, white, and yellow.
 This theme works best with a dark background.
 
-Recommended fonts for this theme: nexus or vga or similar.  If you
-don't have any of these, the 8-bit characters will probably look stupid.
+Recommended fonts for this theme: either UTF-8, or nexus or vga or similar.
+If you don't have any of these, the 8-bit characters will probably look
+stupid.
 EOH
 }
 
@@ -28,9 +29,9 @@ prompt_fire_setup () {
   local date=${5:-'white'}
   local cwd=${6:-'yellow'}
 
-  for code in 333 262 261 260; do
-    local char_$code=$(echo -n "\\0$code")
-  done
+  local char_333 char_262 char_261 char_260
+  autoload -U prompt_special_chars
+  prompt_special_chars
 
   local GRAD1="%{$char_333$char_262$char_261$char_260%}"
   local GRAD2="%{$char_260$char_261$char_262$char_333%}"
diff --git a/Functions/Prompts/prompt_special_chars b/Functions/Prompts/prompt_special_chars
new file mode 100644
index 000000000..8be7dc1cf
--- /dev/null
+++ b/Functions/Prompts/prompt_special_chars
@@ -0,0 +1,18 @@
+# Utility function to set up some special characters
+# used by prompts.
+#
+# These used to be defined to characters found in particular
+# character sets (e.g. IBM852) which now aren't widely used.
+# We still provide them in that form if the current character
+# set isn't UTF-8.  We could in principle use iconv if available.
+
+if [[ ${LC_ALL:-${LC_CTYPE:-$LANG}} = *UTF-8* ]]; then
+  char_333=$'\xe2\x96\x88'
+  char_262=$'\xe2\x96\x93'
+  char_261=$'\xe2\x96\x92'
+  char_260=$'\xe2\x96\x91'
+else
+  for code in 333 262 261 260; do
+    char_$code=$(echo -n "\\0$code")
+  done
+fi